ARM: dts: porter: use demuxer for I2C2

Create a separate bus for HDMI related I2C2 and provide fallback to GPIO.

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

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

diff --git a/arch/arm/boot/dts/r8a7791-porter.dts b/arch/arm/boot/dts/r8a7791-porter.dts
index 9a02d03..c14e6fe 100644 (file)
--- a/arch/arm/boot/dts/r8a7791-porter.dts
+++ b/arch/arm/boot/dts/r8a7791-porter.dts
@@ -29,6 +29,8 @@
 
        aliases {
                serial0 = &scif0;
+               i2c9 = &gpioi2c2;
+               i2c10 = &i2chdmi;
        };
 
        chosen {
@@ -135,6 +137,78 @@
                        clocks = <&x14_clk>;
                };
        };
+
+       gpioi2c2: i2c-9 {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               compatible = "i2c-gpio";
+               status = "disabled";
+               scl-gpios = <&gpio2 6 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+               sda-gpios = <&gpio2 7 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+               i2c-gpio,delay-us = <5>;
+       };
+
+       /*
+        * A fallback to GPIO is provided for I2C2.
+        */
+       i2chdmi: i2c-10 {
+               compatible = "i2c-demux-pinctrl";
+               i2c-parent = <&i2c2>, <&gpioi2c2>;
+               i2c-bus-name = "i2c-hdmi";
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               ak4642: codec@12 {
+                       compatible = "asahi-kasei,ak4642";
+                       #sound-dai-cells = <0>;
+                       reg = <0x12>;
+               };
+
+               composite-in@20 {
+                       compatible = "adi,adv7180";
+                       reg = <0x20>;
+                       remote = <&vin0>;
+
+                       port {
+                               adv7180: endpoint {
+                                       bus-width = <8>;
+                                       remote-endpoint = <&vin0ep>;
+                               };
+                       };
+               };
+
+               hdmi@39 {
+                       compatible = "adi,adv7511w";
+                       reg = <0x39>;
+                       interrupt-parent = <&gpio3>;
+                       interrupts = <29 IRQ_TYPE_LEVEL_LOW>;
+
+                       adi,input-depth = <8>;
+                       adi,input-colorspace = "rgb";
+                       adi,input-clock = "1x";
+                       adi,input-style = <1>;
+                       adi,input-justification = "evenly";
+
+                       ports {
+                               #address-cells = <1>;
+                               #size-cells = <0>;
+
+                               port@0 {
+                                       reg = <0>;
+                                       adv7511_in: endpoint {
+                                               remote-endpoint = <&du_out_rgb>;
+                                       };
+                               };
+
+                               port@1 {
+                                       reg = <1>;
+                                       adv7511_out: endpoint {
+                                               remote-endpoint = <&hdmi_con>;
+                                       };
+                               };
+                       };
+               };
+       };
 };
 
 &extal_clk {
@@ -296,61 +370,9 @@
 
 &i2c2 {
        pinctrl-0 = <&i2c2_pins>;
-       pinctrl-names = "default";
+       pinctrl-names = "i2c-hdmi";
 
-       status = "okay";
        clock-frequency = <400000>;
-
-       ak4642: codec@12 {
-               compatible = "asahi-kasei,ak4642";
-               #sound-dai-cells = <0>;
-               reg = <0x12>;
-       };
-
-       composite-in@20 {
-               compatible = "adi,adv7180";
-               reg = <0x20>;
-               remote = <&vin0>;
-
-               port {
-                       adv7180: endpoint {
-                               bus-width = <8>;
-                               remote-endpoint = <&vin0ep>;
-                       };
-               };
-       };
-
-       hdmi@39 {
-               compatible = "adi,adv7511w";
-               reg = <0x39>;
-               interrupt-parent = <&gpio3>;
-               interrupts = <29 IRQ_TYPE_LEVEL_LOW>;
-
-               adi,input-depth = <8>;
-               adi,input-colorspace = "rgb";
-               adi,input-clock = "1x";
-               adi,input-style = <1>;
-               adi,input-justification = "evenly";
-
-               ports {
-                       #address-cells = <1>;
-                       #size-cells = <0>;
-
-                       port@0 {
-                               reg = <0>;
-                               adv7511_in: endpoint {
-                                       remote-endpoint = <&du_out_rgb>;
-                               };
-                       };
-
-                       port@1 {
-                               reg = <1>;
-                               adv7511_out: endpoint {
-                                       remote-endpoint = <&hdmi_con>;
-                               };
-                       };
-               };
-       };
 };
 
 &sata0 {