diff options
author | Andrzej Hajda <a.hajda@samsung.com> | 2018-07-26 16:22:09 +0300 |
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committer | Krzysztof Kozlowski <krzk@kernel.org> | 2018-08-29 21:57:02 +0300 |
commit | 620375c8fdf2f9f5110ed48d6c407cc4b7554f86 (patch) | |
tree | f540af3e8cccbb1321ada5196e17ca9f3d010f6d /arch/arm/boot/dts/exynos5250-arndale.dts | |
parent | 0772cf588cc9ee1bc151d109769f8729cee3a084 (diff) | |
download | linux-620375c8fdf2f9f5110ed48d6c407cc4b7554f86.tar.xz |
ARM: dts: exynos: Use i2c-gpio for HDMI-DDC on Arndale
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>
Diffstat (limited to 'arch/arm/boot/dts/exynos5250-arndale.dts')
-rw-r--r-- | arch/arm/boot/dts/exynos5250-arndale.dts | 28 |
1 files changed, 20 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>; + }; +}; |