ARM: dts: exynos: Use i2c-gpio for HDMI-DDC on Arndale (620375c8) · Commits · 戴 / test

arch/arm/boot/dts/exynos5250-arndale.dts

+20 −8

Original line number	Diff line number	Diff line
		@@ -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 −0

Original line number	Diff line number	Diff line
		@@ -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>;