ARM: dts: silk: use demuxer for I2C1

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

1 files changed, 75 insertions, 53 deletions

diff --git a/arch/arm/boot/dts/r8a7794-silk.dts b/arch/arm/boot/dts/r8a7794-silk.dts
index edfad0e5ac53..f1afe2dda13a 100644
--- a/arch/arm/boot/dts/r8a7794-silk.dts
+++ b/arch/arm/boot/dts/r8a7794-silk.dts
@@ -31,6 +31,8 @@
 
         aliases {
                 serial0 = &scif2;
+                i2c9 = &gpioi2c1;
+                i2c10 = &i2chdmi;
         };
 
         chosen {
@@ -153,6 +155,78 @@
                         clocks = <&x9_clk>;
                 };
         };
+
+        gpioi2c1: i2c-9 {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                compatible = "i2c-gpio";
+                status = "disabled";
+                scl-gpios = <&gpio4 0 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+                sda-gpios = <&gpio4 1 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+                i2c-gpio,delay-us = <5>;
+        };
+
+        /*
+         * A fallback to GPIO is provided for I2C1.
+         */
+        i2chdmi: i2c-10 {
+                compatible = "i2c-demux-pinctrl";
+                i2c-parent = <&i2c1>, <&gpioi2c1>;
+                i2c-bus-name = "i2c-hdmi";
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                ak4643: codec@12 {
+                        compatible = "asahi-kasei,ak4643";
+                        #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 = <&gpio5>;
+                        interrupts = <23 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_rgb0>;
+                                        };
+                                };
+
+                                port@1 {
+                                        reg = <1>;
+                                        adv7511_out: endpoint {
+                                                remote-endpoint = <&hdmi_con>;
+                                        };
+                                };
+                        };
+                };
+        };
 };
 
 &extal_clk {
@@ -268,61 +342,9 @@
 
 &i2c1 {
         pinctrl-0 = <&i2c1_pins>;
-        pinctrl-names = "default";
+        pinctrl-names = "i2c-hdmi";
 
-        status = "okay";
         clock-frequency = <400000>;
-
-        ak4643: codec@12 {
-                compatible = "asahi-kasei,ak4643";
-                #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 = <&gpio5>;
-                interrupts = <23 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_rgb0>;
-                                };
-                        };
-
-                        port@1 {
-                                reg = <1>;
-                                adv7511_out: endpoint {
-                                        remote-endpoint = <&hdmi_con>;
-                                };
-                        };
-                };
-        };
 };
 
 &mmcif0 {