[PATCH v2 2/4] ARM: dts: r8a7790: lager: use demuxer for IIC1/I2C1

[Simon Horman]

Make it possible to select which I2C1 IP core you want to run on the
EXIO-A connector.

This is based on reference work for the I2C0 core of the lager by Wolfram Sang.

Cc: Wolfram Sang <wsa+rene...@sang-engineering.com>
Signed-off-by: Simon Horman <horms+rene...@verge.net.au>
---
 arch/arm/boot/dts/r8a7790-lager.dts | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boot/dts/r8a7790-lager.dts 
b/arch/arm/boot/dts/r8a7790-lager.dts
index 71d62ca282ea..20abb1470f91 100644
--- a/arch/arm/boot/dts/r8a7790-lager.dts
+++ b/arch/arm/boot/dts/r8a7790-lager.dts
@@ -51,6 +51,7 @@
                serial0 = &scif0;
                serial1 = &scifa1;
                i2c8 = "i2cexio0";
+               i2c9 = "i2cexio1";
        };
 
        chosen {
@@ -270,6 +271,18 @@
                #address-cells = <1>;
                #size-cells = <0>;
        };
+
+       /*
+        * IIC1/I2C1 is routed to EXIO connector A, pins 78 (SCL) + 80 (SDA).
+        * For further notes see i2cexio0.
+        */
+       i2cexio1: i2c-9 {
+               compatible = "i2c-demux-pinctrl";
+               i2c-parent = <&iic1>, <&i2c1>;
+               i2c-bus-name = "i2c-exio1";
+               #address-cells = <1>;
+               #size-cells = <0>;
+       };
 };
 
 &du {
@@ -392,6 +405,11 @@
                function = "iic0";
        };
 
+       i2c1_pins: i2c1 {
+               groups = "i2c1";
+               function = "i2c1";
+       };
+
        iic1_pins: iic1 {
                groups = "iic1";
                function = "iic1";
@@ -588,10 +606,14 @@
        pinctrl-names = "i2c-exio0";
 };
 
+&i2c1  {
+       pinctrl-0 = <&i2c1_pins>;
+       pinctrl-names = "i2c-exio1";
+};
+
 &iic1  {
-       status = "okay";
        pinctrl-0 = <&iic1_pins>;
-       pinctrl-names = "default";
+       pinctrl-names = "i2c-exio1";
 };
 
 &iic2  {
-- 
2.1.4