[PATCH v4 11/14] ARM: dts: alt: use demuxer for I2C1

[Wolfram Sang]

From: Simon Horman <horms+rene...@verge.net.au>

Create a separate bus for HDMI related I2C1 and provide fallback to GPIO.

Based on work for the r8a7790/lager by Wolfram Sang.

Signed-off-by: Simon Horman <horms+rene...@verge.net.au>
[wsa: rebased and fixed aliases]
Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
---
 arch/arm/boot/dts/r8a7794-alt.dts | 53 ++++++++++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 15 deletions(-)

diff --git a/arch/arm/boot/dts/r8a7794-alt.dts 
b/arch/arm/boot/dts/r8a7794-alt.dts
index ccb80d66076f3d..81368d11e4d3be 100644
--- a/arch/arm/boot/dts/r8a7794-alt.dts
+++ b/arch/arm/boot/dts/r8a7794-alt.dts
@@ -18,6 +18,8 @@
 
        aliases {
                serial0 = &scif2;
+               i2c9 = &gpioi2c1;
+               i2c11 = &i2chdmi;
        };
 
        chosen {
@@ -135,6 +137,41 @@
                #clock-cells = <0>;
                clock-frequency = <148500000>;
        };
+
+       gpioi2c1: i2c-9 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "i2c-gpio";
+               status = "disabled";
+               gpios = <&gpio4 1 GPIO_ACTIVE_HIGH /* sda */
+                        &gpio4 0 GPIO_ACTIVE_HIGH /* scl */
+                       >;
+               i2c-gpio,delay-us = <5>;
+       };
+
+       /*
+        * A fallback to GPIO is provided for I2C1.
+        */
+       i2chdmi: i2c-11 {
+               compatible = "i2c-demux-pinctrl";
+               i2c-parent = <&i2c1>, <&gpioi2c1>;
+               i2c-bus-name = "i2c-hdmi";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               composite-in@20 {
+                       compatible = "adi,adv7180";
+                       reg = <0x20>;
+                       remote = <&vin0>;
+
+                       port {
+                               adv7180: endpoint {
+                                       bus-width = <8>;
+                                       remote-endpoint = <&vin0ep>;
+                               };
+                       };
+               };
+       };
 };
 
 &du {
@@ -296,23 +333,9 @@
 
 &i2c1 {
        pinctrl-0 = <&i2c1_pins>;
-       pinctrl-names = "default";
+       pinctrl-names = "i2c-hdmi";
 
-       status = "okay";
        clock-frequency = <400000>;
-
-       composite-in@20 {
-               compatible = "adi,adv7180";
-               reg = <0x20>;
-               remote = <&vin0>;
-
-               port {
-                       adv7180: endpoint {
-                               bus-width = <8>;
-                               remote-endpoint = <&vin0ep>;
-                       };
-               };
-       };
 };
 
 &vin0 {
-- 
2.9.3