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video: exynos_dp: device tree documentation

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Add documentation for the DT bindings in exynos display port driver.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
This commit is contained in:
Ajay Kumar 2012-10-13 05:48:00 +09:00 committed by Jingoo Han
parent c4e235c2ad
commit 825e90d0a1
1 changed files with 80 additions and 0 deletions
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Documentation/devicetree/bindings/video/exynos_dp.txt Normal file
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The Exynos display port interface should be configured based on
the type of panel connected to it.
We use two nodes:
-dp-controller node
-dptx-phy node(defined inside dp-controller node)
For the DP-PHY initialization, we use the dptx-phy node.
Required properties for dptx-phy:
-reg:
Base address of DP PHY register.
-samsung,enable-mask:
The bit-mask used to enable/disable DP PHY.
For the Panel initialization, we read data from dp-controller node.
Required properties for dp-controller:
-compatible:
should be "samsung,exynos5-dp".
-reg:
physical base address of the controller and length
of memory mapped region.
-interrupts:
interrupt combiner values.
-interrupt-parent:
phandle to Interrupt combiner node.
-samsung,color-space:
input video data format.
COLOR_RGB = 0, COLOR_YCBCR422 = 1, COLOR_YCBCR444 = 2
-samsung,dynamic-range:
dynamic range for input video data.
VESA = 0, CEA = 1
-samsung,ycbcr-coeff:
YCbCr co-efficients for input video.
COLOR_YCBCR601 = 0, COLOR_YCBCR709 = 1
-samsung,color-depth:
number of bits per colour component.
COLOR_6 = 0, COLOR_8 = 1, COLOR_10 = 2, COLOR_12 = 3
-samsung,link-rate:
link rate supported by the panel.
LINK_RATE_1_62GBPS = 0x6, LINK_RATE_2_70GBPS = 0x0A
-samsung,lane-count:
number of lanes supported by the panel.
LANE_COUNT1 = 1, LANE_COUNT2 = 2, LANE_COUNT4 = 4
Optional properties for dp-controller:
-interlaced:
interlace scan mode.
Progressive if defined, Interlaced if not defined
-vsync-active-high:
VSYNC polarity configuration.
High if defined, Low if not defined
-hsync-active-high:
HSYNC polarity configuration.
High if defined, Low if not defined
Example:
SOC specific portion:
dp-controller {
compatible = "samsung,exynos5-dp";
reg = <0x145b0000 0x10000>;
interrupts = <10 3>;
interrupt-parent = <&combiner>;
dptx-phy {
reg = <0x10040720>;
samsung,enable-mask = <1>;
};
};
Board Specific portion:
dp-controller {
samsung,color-space = <0>;
samsung,dynamic-range = <0>;
samsung,ycbcr-coeff = <0>;
samsung,color-depth = <1>;
samsung,link-rate = <0x0a>;
samsung,lane-count = <4>;
};