Add Gateworks System Controller support to Gateworks Ventana boards:
- add dt bindings for GSC mfd driver and hwmon driver for ADC's and
  fan controllers.
- add dt bindings for gpio-keys driver for push-button and interrupt events

Signed-off-by: Tim Harvey <thar...@gateworks.com>
---
v4:
 - add missing #address-cells to gw5912 gsc node to address dtc warning

v3:
 - change underscore to hyphen in node names
 - use generic node name for gsc_gpio nodes

v2:
 - use keycode bindings from linux-event-codes.h
 - fix gw5910 vdd_bat adc mode
 - fix gw5913 vdd_bat adc mode
---
 arch/arm/boot/dts/imx6qdl-gw51xx.dtsi | 153 +++++++++++++++++++++++++++++--
 arch/arm/boot/dts/imx6qdl-gw52xx.dtsi | 159 ++++++++++++++++++++++++++++++--
 arch/arm/boot/dts/imx6qdl-gw53xx.dtsi | 165 +++++++++++++++++++++++++++++++--
 arch/arm/boot/dts/imx6qdl-gw54xx.dtsi | 167 ++++++++++++++++++++++++++++++++--
 arch/arm/boot/dts/imx6qdl-gw551x.dtsi | 147 ++++++++++++++++++++++++++++--
 arch/arm/boot/dts/imx6qdl-gw552x.dtsi | 153 +++++++++++++++++++++++++++++--
 arch/arm/boot/dts/imx6qdl-gw553x.dtsi | 141 +++++++++++++++++++++++++++-
 arch/arm/boot/dts/imx6qdl-gw560x.dtsi | 164 +++++++++++++++++++++++++++++++--
 arch/arm/boot/dts/imx6qdl-gw5903.dtsi | 140 +++++++++++++++++++++++++++-
 arch/arm/boot/dts/imx6qdl-gw5904.dtsi | 141 +++++++++++++++++++++++++++-
 arch/arm/boot/dts/imx6qdl-gw5907.dtsi | 142 ++++++++++++++++++++++++++++-
 arch/arm/boot/dts/imx6qdl-gw5910.dtsi | 160 +++++++++++++++++++++++++++++++-
 arch/arm/boot/dts/imx6qdl-gw5912.dtsi | 148 +++++++++++++++++++++++++++++-
 arch/arm/boot/dts/imx6qdl-gw5913.dtsi | 153 ++++++++++++++++++++++++++++++-
 14 files changed, 2076 insertions(+), 57 deletions(-)

diff --git a/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi
index 419a7cd..7705285 100644
--- a/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw51xx.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -19,6 +20,53 @@
                bootargs = "console=ttymxc1,115200";
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -102,6 +150,103 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_an1";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
+               compatible = "nxp,pca9555";
+               reg = <0x23>;
+               gpio-controller;
+               #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
+       };
+
        eeprom1: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
@@ -126,13 +271,6 @@
                pagesize = <16>;
        };
 
-       gpio: pca9555@23 {
-               compatible = "nxp,pca9555";
-               reg = <0x23>;
-               gpio-controller;
-               #gpio-cells = <2>;
-       };
-
        rtc: ds1672@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
@@ -387,6 +525,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0x0001b0b0 /* 
GSC_IRQ# */
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
index 60563ff..9e5bec1 100644
--- a/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw52xx.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -28,6 +29,53 @@
                default-brightness-level = <7>;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -165,6 +213,109 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_1p0";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+
+                       channel@29 {
+                               gw,mode = <1>;
+                               reg = <0x29>;
+                               label = "vdd_an1";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
+               compatible = "nxp,pca9555";
+               reg = <0x23>;
+               gpio-controller;
+               #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
+       };
+
        eeprom1: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
@@ -189,13 +340,6 @@
                pagesize = <16>;
        };
 
-       gpio: pca9555@23 {
-               compatible = "nxp,pca9555";
-               reg = <0x23>;
-               gpio-controller;
-               #gpio-cells = <2>;
-       };
-
        rtc: ds1672@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
@@ -504,6 +648,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0xb0b1
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
index 8942bec..7ea4fdd 100644
--- a/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw53xx.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -28,6 +29,53 @@
                default-brightness-level = <7>;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -158,6 +206,115 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_1p0";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+
+                       channel@26 {
+                               gw,mode = <1>;
+                               reg = <0x26>;
+                               label = "vdd_gps";
+                       };
+
+                       channel@29 {
+                               gw,mode = <1>;
+                               reg = <0x29>;
+                               label = "vdd_an1";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
+               compatible = "nxp,pca9555";
+               reg = <0x23>;
+               gpio-controller;
+               #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
+       };
+
        eeprom1: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
@@ -182,13 +339,6 @@
                pagesize = <16>;
        };
 
-       gpio: pca9555@23 {
-               compatible = "nxp,pca9555";
-               reg = <0x23>;
-               gpio-controller;
-               #gpio-cells = <2>;
-       };
-
        rtc: ds1672@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
@@ -486,6 +636,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0xb0b1
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
index c40583d..0c19759 100644
--- a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 #include <dt-bindings/sound/fsl-imx-audmux.h>
 
 / {
@@ -29,6 +30,53 @@
                default-brightness-level = <7>;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -195,6 +243,117 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_1p0";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+
+                       channel@26 {
+                               gw,mode = <1>;
+                               reg = <0x26>;
+                               label = "vdd_gps";
+                       };
+               };
+
+               fan-controller@2c {
+                       compatible = "gw,gsc-fan";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <0x2c>;
+               };
+       };
+
+       gsc_gpio: gpio@23 {
+               compatible = "nxp,pca9555";
+               reg = <0x23>;
+               gpio-controller;
+               #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
+       };
+
        eeprom1: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
@@ -219,13 +378,6 @@
                pagesize = <16>;
        };
 
-       gpio: pca9555@23 {
-               compatible = "nxp,pca9555";
-               reg = <0x23>;
-               gpio-controller;
-               #gpio-cells = <2>;
-       };
-
        rtc: ds1672@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
@@ -571,6 +723,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0xb0b1
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw551x.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw551x.dtsi
index 8c33510..1516e2b 100644
--- a/arch/arm/boot/dts/imx6qdl-gw551x.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw551x.dtsi
@@ -47,6 +47,7 @@
 
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/media/tda1997x.h>
+#include <dt-bindings/input/linux-event-codes.h>
 #include <dt-bindings/sound/fsl-imx-audmux.h>
 
 / {
@@ -63,6 +64,53 @@
                bootargs = "console=ttymxc1,115200";
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -167,6 +215,97 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8a";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_1p0b";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
+               compatible = "nxp,pca9555";
+               reg = <0x23>;
+               gpio-controller;
+               #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
+       };
+
        eeprom1: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
@@ -191,13 +330,6 @@
                pagesize = <16>;
        };
 
-       gpio: pca9555@23 {
-               compatible = "nxp,pca9555";
-               reg = <0x23>;
-               gpio-controller;
-               #gpio-cells = <2>;
-       };
-
        rtc: ds1672@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
@@ -464,6 +596,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0xb0b1
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw552x.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw552x.dtsi
index bb35971..0da6e6f 100644
--- a/arch/arm/boot/dts/imx6qdl-gw552x.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw552x.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -20,6 +21,53 @@
                bootargs = "console=ttymxc1,115200";
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -92,6 +140,103 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_1p0";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
+               compatible = "nxp,pca9555";
+               reg = <0x23>;
+               gpio-controller;
+               #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
+       };
+
        eeprom1: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
@@ -116,13 +261,6 @@
                pagesize = <16>;
        };
 
-       gpio: pca9555@23 {
-               compatible = "nxp,pca9555";
-               reg = <0x23>;
-               gpio-controller;
-               #gpio-cells = <2>;
-       };
-
        rtc: ds1672@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
@@ -305,6 +443,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0xb0b1
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw553x.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw553x.dtsi
index ee85031..db30de5 100644
--- a/arch/arm/boot/dts/imx6qdl-gw553x.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw553x.dtsi
@@ -46,6 +46,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -61,6 +62,53 @@
                stdout-path = &uart2;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -130,11 +178,101 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
-       gpio: pca9555@23 {
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8a";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_1p0b";
+                       };
+
+                       channel@26 {
+                               gw,mode = <1>;
+                               reg = <0x26>;
+                               label = "vdd_an1";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
                compatible = "nxp,pca9555";
                reg = <0x23>;
                gpio-controller;
                #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
        };
 
        eeprom1: eeprom@50 {
@@ -428,6 +566,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0xb0b1
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw560x.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw560x.dtsi
index 69ca70d..940520f 100644
--- a/arch/arm/boot/dts/imx6qdl-gw560x.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw560x.dtsi
@@ -88,6 +88,53 @@
                default-on;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -243,6 +290,115 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_an1";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+
+                       channel@26 {
+                               gw,mode = <1>;
+                               reg = <0x26>;
+                               label = "vdd_gps";
+                       };
+
+                       channel@29 {
+                               gw,mode = <1>;
+                               reg = <0x29>;
+                               label = "vdd_an2";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
+               compatible = "nxp,pca9555";
+               reg = <0x23>;
+               gpio-controller;
+               #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
+       };
+
        eeprom1: eeprom@50 {
                compatible = "atmel,24c02";
                reg = <0x50>;
@@ -267,13 +423,6 @@
                pagesize = <16>;
        };
 
-       pca9555: gpio@23 {
-               compatible = "nxp,pca9555";
-               reg = <0x23>;
-               gpio-controller;
-               #gpio-cells = <2>;
-       };
-
        ds1672: rtc@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
@@ -608,6 +757,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0xb0b1
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw5903.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw5903.dtsi
index aee9221..0461085 100644
--- a/arch/arm/boot/dts/imx6qdl-gw5903.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw5903.dtsi
@@ -46,6 +46,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        chosen {
@@ -71,6 +72,53 @@
                default-brightness-level = <100>;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -183,11 +231,101 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
-       pca9555: gpio@23 {
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_an1";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
                compatible = "nxp,pca9555";
                reg = <0x23>;
                gpio-controller;
                #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
        };
 
        eeprom1: eeprom@50 {
diff --git a/arch/arm/boot/dts/imx6qdl-gw5904.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw5904.dtsi
index 76d6cf5..e73090f 100644
--- a/arch/arm/boot/dts/imx6qdl-gw5904.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw5904.dtsi
@@ -46,6 +46,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -68,6 +69,53 @@
                default-brightness-level = <7>;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -205,11 +253,101 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
-       pca9555: gpio@23 {
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_an1";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
                compatible = "nxp,pca9555";
                reg = <0x23>;
                gpio-controller;
                #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
        };
 
        eeprom1: eeprom@50 {
@@ -503,6 +641,7 @@
                fsl,pins = <
                        MX6QDL_PAD_EIM_D21__I2C1_SCL            0x4001b8b1
                        MX6QDL_PAD_EIM_D28__I2C1_SDA            0x4001b8b1
+                       MX6QDL_PAD_GPIO_4__GPIO1_IO04           0x0001b0b0 /* 
GSC_IRQ# */
                >;
        };
 
diff --git a/arch/arm/boot/dts/imx6qdl-gw5907.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw5907.dtsi
index 0bdebdd..b1ff7c8 100644
--- a/arch/arm/boot/dts/imx6qdl-gw5907.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw5907.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -19,6 +20,53 @@
                stdout-path = &uart2;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -102,11 +150,101 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
-       gpio@23 {
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_an1";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
                compatible = "nxp,pca9555";
                reg = <0x23>;
                gpio-controller;
                #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
        };
 
        eeprom@50 {
@@ -133,7 +271,7 @@
                pagesize = <16>;
        };
 
-       rtc@68 {
+       ds1672@68 {
                compatible = "dallas,ds1672";
                reg = <0x68>;
        };
diff --git a/arch/arm/boot/dts/imx6qdl-gw5910.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw5910.dtsi
index 0857de5..11f84ee 100644
--- a/arch/arm/boot/dts/imx6qdl-gw5910.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw5910.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -22,6 +23,53 @@
                reg = <0x10000000 0x20000000>;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -111,11 +159,121 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
-       gpio@23 {
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@6 {
+                               gw,mode = <0>;
+                               reg = <0x06>;
+                               label = "temp";
+                       };
+
+                       channel@8 {
+                               gw,mode = <3>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@82 {
+                               gw,mode = <2>;
+                               reg = <0x82>;
+                               label = "vdd_vin";
+                               gw,voltage-divider-ohms = <22100 1000>;
+                               gw,voltage-offset-microvolt = <800000>;
+                       };
+
+                       channel@84 {
+                               gw,mode = <2>;
+                               reg = <0x84>;
+                               label = "vdd_5p0";
+                               gw,voltage-divider-ohms = <22100 10000>;
+                       };
+
+                       channel@86 {
+                               gw,mode = <2>;
+                               reg = <0x86>;
+                               label = "vdd_3p3";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+
+                       channel@88 {
+                               gw,mode = <2>;
+                               reg = <0x88>;
+                               label = "vdd_2p5";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+
+                       channel@8c {
+                               gw,mode = <2>;
+                               reg = <0x8c>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@8e {
+                               gw,mode = <2>;
+                               reg = <0x8e>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@90 {
+                               gw,mode = <2>;
+                               reg = <0x90>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@92 {
+                               gw,mode = <2>;
+                               reg = <0x92>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@98 {
+                               gw,mode = <2>;
+                               reg = <0x98>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@9a {
+                               gw,mode = <2>;
+                               reg = <0x9a>;
+                               label = "vdd_1p0";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+
+                       channel@9c {
+                               gw,mode = <2>;
+                               reg = <0x9c>;
+                               label = "vdd_an1";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+
+                       channel@a2 {
+                               gw,mode = <2>;
+                               reg = <0xa2>;
+                               label = "vdd_gsc";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
                compatible = "nxp,pca9555";
                reg = <0x23>;
                gpio-controller;
                #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
        };
 
        eeprom@50 {
diff --git a/arch/arm/boot/dts/imx6qdl-gw5912.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw5912.dtsi
index 8c57fd2..0a1ffff 100644
--- a/arch/arm/boot/dts/imx6qdl-gw5912.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw5912.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -20,6 +21,53 @@
                stdout-path = &uart2;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -106,11 +154,109 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
-       gpio@23 {
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@0 {
+                               gw,mode = <0>;
+                               reg = <0x00>;
+                               label = "temp";
+                       };
+
+                       channel@2 {
+                               gw,mode = <1>;
+                               reg = <0x02>;
+                               label = "vdd_vin";
+                       };
+
+                       channel@5 {
+                               gw,mode = <1>;
+                               reg = <0x05>;
+                               label = "vdd_3p3";
+                       };
+
+                       channel@8 {
+                               gw,mode = <1>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@b {
+                               gw,mode = <1>;
+                               reg = <0x0b>;
+                               label = "vdd_5p0";
+                       };
+
+                       channel@e {
+                               gw,mode = <1>;
+                               reg = <0xe>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@11 {
+                               gw,mode = <1>;
+                               reg = <0x11>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@14 {
+                               gw,mode = <1>;
+                               reg = <0x14>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@17 {
+                               gw,mode = <1>;
+                               reg = <0x17>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@1d {
+                               gw,mode = <1>;
+                               reg = <0x1d>;
+                               label = "vdd_1p8";
+                       };
+
+                       channel@20 {
+                               gw,mode = <1>;
+                               reg = <0x20>;
+                               label = "vdd_1p0";
+                       };
+
+                       channel@23 {
+                               gw,mode = <1>;
+                               reg = <0x23>;
+                               label = "vdd_2p5";
+                       };
+               };
+
+               fan-controller@a {
+                       compatible = "gw,gsc-fan";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <0x0a>;
+               };
+       };
+
+       gsc_gpio: gpio@23 {
                compatible = "nxp,pca9555";
                reg = <0x23>;
                gpio-controller;
                #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
        };
 
        eeprom@50 {
diff --git a/arch/arm/boot/dts/imx6qdl-gw5913.dtsi 
b/arch/arm/boot/dts/imx6qdl-gw5913.dtsi
index 635c203..d62a8da 100644
--- a/arch/arm/boot/dts/imx6qdl-gw5913.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw5913.dtsi
@@ -4,6 +4,7 @@
  */
 
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/linux-event-codes.h>
 
 / {
        /* these are used by bootloader for disabling nodes */
@@ -19,6 +20,53 @@
                stdout-path = &uart2;
        };
 
+       gpio-keys {
+               compatible = "gpio-keys";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               user-pb {
+                       label = "user_pb";
+                       gpios = <&gsc_gpio 0 GPIO_ACTIVE_LOW>;
+                       linux,code = <BTN_0>;
+               };
+
+               user-pb1x {
+                       label = "user_pb1x";
+                       linux,code = <BTN_1>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <0>;
+               };
+
+               key-erased {
+                       label = "key-erased";
+                       linux,code = <BTN_2>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <1>;
+               };
+
+               eeprom-wp {
+                       label = "eeprom_wp";
+                       linux,code = <BTN_3>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <2>;
+               };
+
+               tamper {
+                       label = "tamper";
+                       linux,code = <BTN_4>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <5>;
+               };
+
+               switch-hold {
+                       label = "switch_hold";
+                       linux,code = <BTN_5>;
+                       interrupt-parent = <&gsc>;
+                       interrupts = <7>;
+               };
+       };
+
        leds {
                compatible = "gpio-leds";
                pinctrl-names = "default";
@@ -87,11 +135,114 @@
        pinctrl-0 = <&pinctrl_i2c1>;
        status = "okay";
 
-       gpio@23 {
+       gsc: gsc@20 {
+               compatible = "gw,gsc";
+               reg = <0x20>;
+               interrupt-parent = <&gpio1>;
+               interrupts = <4 GPIO_ACTIVE_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <1>;
+               #size-cells = <0>;
+
+               adc {
+                       compatible = "gw,gsc-adc";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+
+                       channel@6 {
+                               gw,mode = <0>;
+                               reg = <0x06>;
+                               label = "temp";
+                       };
+
+                       channel@8 {
+                               gw,mode = <3>;
+                               reg = <0x08>;
+                               label = "vdd_bat";
+                       };
+
+                       channel@82 {
+                               gw,mode = <2>;
+                               reg = <0x82>;
+                               label = "vdd_vin";
+                               gw,voltage-divider-ohms = <22100 1000>;
+                               gw,voltage-offset-microvolt = <800000>;
+                       };
+
+                       channel@84 {
+                               gw,mode = <2>;
+                               reg = <0x84>;
+                               label = "vdd_5p0";
+                               gw,voltage-divider-ohms = <22100 10000>;
+                       };
+
+                       channel@86 {
+                               gw,mode = <2>;
+                               reg = <0x86>;
+                               label = "vdd_3p3";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+
+                       channel@88 {
+                               gw,mode = <2>;
+                               reg = <0x88>;
+                               label = "vdd_2p5";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+
+                       channel@8c {
+                               gw,mode = <2>;
+                               reg = <0x8c>;
+                               label = "vdd_arm";
+                       };
+
+                       channel@8e {
+                               gw,mode = <2>;
+                               reg = <0x8e>;
+                               label = "vdd_soc";
+                       };
+
+                       channel@90 {
+                               gw,mode = <2>;
+                               reg = <0x90>;
+                               label = "vdd_1p5";
+                       };
+
+                       channel@92 {
+                               gw,mode = <2>;
+                               reg = <0x92>;
+                               label = "vdd_1p0";
+                       };
+
+                       channel@98 {
+                               gw,mode = <2>;
+                               reg = <0x98>;
+                               label = "vdd_3p0";
+                       };
+
+                       channel@9a {
+                               gw,mode = <2>;
+                               reg = <0x9a>;
+                               label = "vdd_an1";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+
+                       channel@a2 {
+                               gw,mode = <2>;
+                               reg = <0xa2>;
+                               label = "vdd_gsc";
+                               gw,voltage-divider-ohms = <10000 10000>;
+                       };
+               };
+       };
+
+       gsc_gpio: gpio@23 {
                compatible = "nxp,pca9555";
                reg = <0x23>;
                gpio-controller;
                #gpio-cells = <2>;
+               interrupt-parent = <&gsc>;
+               interrupts = <4>;
        };
 
        eeprom@50 {
-- 
2.7.4

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