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ARM: dts: exynos: Use i2c-gpio for HDMI-DDC on Arndale

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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@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Andrzej Hajda 2018-07-26 15:22:09 +02:00 • committed by Krzysztof Kozlowski
parent 0772cf588c
commit 620375c8fd
2 changed files with 26 additions and 8 deletions
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28
arch/arm/boot/dts/exynos5250-arndale.dts
View file

@ -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>;
};
};

6
arch/arm/boot/dts/exynos5250-pinctrl.dtsi
View file

@ -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>;