ARM: dts: koelsch: use demuxer for I2C1

Make it possible to fallback to GPIO for I2C1 on the EXIO-C connector.

This is based on reference work for the I2C0 core of the lager/r8a7790
by Wolfram Sang.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
[wsa: rebased and fixed aliases]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

diff --git a/arch/arm/boot/dts/r8a7791-koelsch.dts b/arch/arm/boot/dts/r8a7791-koelsch.dts
index c457b43deb7d8ebccb145faa5a06e0a5eb81fd69..d5c80e6bff22bad0ba3fb235e734b0cdff542cba 100644 (file)
--- a/arch/arm/boot/dts/r8a7791-koelsch.dts
+++ b/arch/arm/boot/dts/r8a7791-koelsch.dts
@@ -50,6 +50,8 @@ / {
        aliases {
                serial0 = &scif0;
                serial1 = &scif1;
+               i2c9 = &gpioi2c1;
+               i2c12 = &i2cexio1;
        };
 
        chosen {
@@ -298,6 +300,29 @@ x13_clk: x13-clock {
                #clock-cells = <0>;
                clock-frequency = <148500000>;
        };
+
+       gpioi2c1: i2c-9 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "i2c-gpio";
+               status = "disabled";
+               gpios = <&gpio7 16 GPIO_ACTIVE_HIGH /* sda */
+                        &gpio7 15 GPIO_ACTIVE_HIGH /* scl */
+                       >;
+               i2c-gpio,delay-us = <5>;
+       };
+
+       /*
+        * I2C1 is routed to EXIO connector B, pins 64 (SCL) + 66 (SDA).
+        * A fallback to GPIO is provided.
+        */
+       i2cexio1: i2c-12 {
+               compatible = "i2c-demux-pinctrl";
+               i2c-parent = <&i2c1>, <&gpioi2c1>;
+               i2c-bus-name = "i2c-exio1";
+               #address-cells = <1>;
+               #size-cells = <0>;
+       };
 };
 
 &du {
@@ -333,6 +358,11 @@ &pfc {
        pinctrl-0 = <&scif_clk_pins>;
        pinctrl-names = "default";
 
+       i2c1_pins: i2c1 {
+               groups = "i2c1";
+               function = "i2c1";
+       };
+
        i2c2_pins: i2c2 {
                groups = "i2c2";
                function = "i2c2";
@@ -581,6 +611,11 @@ pmic: pmic@0 {
        };
 };
 
+&i2c1 {
+       pinctrl-0 = <&i2c1_pins>;
+       pinctrl-names = "i2c-exio1";
+};
+
 &i2c2 {
        pinctrl-0 = <&i2c2_pins>;
        pinctrl-names = "default";