diff options
| author | Andrzej Hajda <a.hajda@samsung.com> | 2018-07-26 15:22:09 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-20 18:45:36 +0100 |
| commit | 0baa3fe5805e8e5bcff3161e3691bbbe5baff0a4 (patch) | |
| tree | fd25aef8c1f412613d3dcd1f8908cd6cc5ff5ad5 | |
| parent | 8e6acc5ee14d7671ad98e6a690efc9187b86eec4 (diff) | |
ARM: dts: exynos: Use i2c-gpio for HDMI-DDC on Arndale
[ Upstream commit 620375c8fdf2f9f5110ed48d6c407cc4b7554f86 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | arch/arm/boot/dts/exynos5250-arndale.dts | 28 | ||||
| -rw-r--r-- | 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 7a8a5c55701a..bb3fcd652b5d 100644 --- a/arch/arm/boot/dts/exynos5250-arndale.dts +++ b/arch/arm/boot/dts/exynos5250-arndale.dts @@ -150,7 +150,7 @@ &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>; @@ -452,13 +452,6 @@ }; }; -&i2c_2 { - status = "okay"; - /* used by HDMI DDC */ - samsung,i2c-sda-delay = <100>; - samsung,i2c-max-bus-freq = <66000>; -}; - &i2c_3 { status = "okay"; @@ -547,3 +540,22 @@ 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>; |