HDMI-DDC for unknown reasons doesn't work with Exynos I2C
controllers. Fortunately i2c-gpio comes to the rescue.
Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
---
arch/arm/boot/dts/exynos5250-arndale.dts | 28 ++++++++++++++++-------
arch/arm/boot/dts/exynos5250-pinctrl.dtsi | 6 +++++
2 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/arch/arm/boot/dts/exynos5250-arndale.dts b/arch/arm/boot/dts/exynos5250-arndale.dts
index 816d89d4cefd..e7a9b9aa85f1 100644
--- a/arch/arm/boot/dts/exynos5250-arndale.dts
+++ b/arch/arm/boot/dts/exynos5250-arndale.dts
@@ -211,7 +211,7 @@
&hdmi {
status = "okay";
- ddc = <&i2c_2>;
+ ddc = <&i2c_ddc>;
hpd-gpios = <&gpx3 7 GPIO_ACTIVE_LOW>;
vdd_osc-supply = <&ldo10_reg>;
vdd_pll-supply = <&ldo8_reg>;
@@ -513,13 +513,6 @@
};
};
-&i2c_2 {
- status = "okay";
- /* used by HDMI DDC */
- samsung,i2c-sda-delay = <100>;
- samsung,i2c-max-bus-freq = <66000>;
-};
-
&i2c_3 {
status = "okay";
@@ -608,3 +601,22 @@
status = "okay";
samsung,exynos-sataphy-i2c-phandle = <&sata_phy_i2c>;
};
+
+&soc {
+ /*
+ * For unknown reasons HDMI-DDC does not work with Exynos I2C
+ * controllers. Lets use software I2C over GPIO pins as a workaround.
+ */
+ i2c_ddc: i2c-gpio {
+ pinctrl-names = "default";
+ pinctrl-0 = <&i2c2_gpio_bus>;
+ status = "okay";
+ compatible = "i2c-gpio";
+ gpios = <&gpa0 6 0 /* sda */
+ &gpa0 7 0 /* scl */
+ >;
+ i2c-gpio,delay-us = <2>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
+};
diff --git a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
index 6ff6dea29d44..b25d520393b8 100644
--- a/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
+++ b/arch/arm/boot/dts/exynos5250-pinctrl.dtsi
@@ -225,6 +225,12 @@
samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
};
+ i2c2_gpio_bus: i2c2-gpio-bus {
+ samsung,pins = "gpa0-6", "gpa0-7";
+ samsung,pin-pud = <EXYNOS_PIN_PULL_NONE>;
+ samsung,pin-drv = <EXYNOS4_PIN_DRV_LV1>;
+ };
+
uart2_data: uart2-data {
samsung,pins = "gpa1-0", "gpa1-1";
samsung,pin-function = <EXYNOS_PIN_FUNC_2>;
--
2.18.0
--
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