Create a separate bus for HDMI related I2C1 and provide fallback to GPIO.
Based on work for the r8a7790/lager by Wolfram Sang.
Cc: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
---
v3
* New patch
---
arch/arm/boot/dts/r8a7794-alt.dts | 54 ++++++++++++++++++++++++++++-----------
1 file changed, 39 insertions(+), 15 deletions(-)
diff --git a/arch/arm/boot/dts/r8a7794-alt.dts b/arch/arm/boot/dts/r8a7794-alt.dts
index 1ad37d431a2a..d00b1b33f6ed 100644
--- a/arch/arm/boot/dts/r8a7794-alt.dts
+++ b/arch/arm/boot/dts/r8a7794-alt.dts
@@ -10,6 +10,7 @@
/dts-v1/;
#include "r8a7794.dtsi"
+#include <dt-bindings/gpio/gpio.h>
/ {
model = "Alt";
@@ -17,6 +18,8 @@
aliases {
serial0 = &scif2;
+ i2c9 = "gpioi2c1";
+ i2c11 = "i2chdmi";
};
chosen {
@@ -77,6 +80,41 @@
#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 {
@@ -171,23 +209,9 @@
&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 {
--
2.1.4
