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dt-bindings: display: Add Document for Rockchip Soc LVDS
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This patch add Document for Rockchip Soc RK3288 LVDS,
This based on the patches from Mark yao and Heiko Stuebner.

Signed-off-by: Mark yao <mark.yao@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Sandy Huang <hjc@rock-chips.com>
Reviewed-by: Mark Yao <mark.yao@rock-chips.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1504351729-135932-1-git-send-email-hjc@rock-chips.com
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Sandy Huang authored and Mark Yao committed Sep 8, 2017
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Rockchip RK3288 LVDS interface
================================

Required properties:
- compatible: matching the soc type, one of
- "rockchip,rk3288-lvds";

- reg: physical base address of the controller and length
of memory mapped region.
- clocks: must include clock specifiers corresponding to entries in the
clock-names property.
- clock-names: must contain "pclk_lvds"

- avdd1v0-supply: regulator phandle for 1.0V analog power
- avdd1v8-supply: regulator phandle for 1.8V analog power
- avdd3v3-supply: regulator phandle for 3.3V analog power

- rockchip,grf: phandle to the general register files syscon
- rockchip,output: "rgb", "lvds" or "duallvds", This describes the output interface

Optional properties:
- pinctrl-names: must contain a "lcdc" entry.
- pinctrl-0: pin control group to be used for this controller.

Required nodes:

The lvds has two video ports as described by
Documentation/devicetree/bindings/media/video-interfaces.txt
Their connections are modeled using the OF graph bindings specified in
Documentation/devicetree/bindings/graph.txt.

- video port 0 for the VOP input, the remote endpoint maybe vopb or vopl
- video port 1 for either a panel or subsequent encoder

the lvds panel described by
Documentation/devicetree/bindings/display/panel/simple-panel.txt

Panel required properties:
- ports for remote LVDS output

Panel optional properties:
- data-mapping: should be "vesa-24","jeida-24" or "jeida-18".
This describes decribed by:
Documentation/devicetree/bindings/display/panel/panel-lvds.txt

Example:

lvds_panel: lvds-panel {
compatible = "auo,b101ean01";
enable-gpios = <&gpio7 21 GPIO_ACTIVE_HIGH>;
data-mapping = "jeida-24";

ports {
panel_in_lvds: endpoint {
remote-endpoint = <&lvds_out_panel>;
};
};
};

For Rockchip RK3288:

lvds: lvds@ff96c000 {
compatible = "rockchip,rk3288-lvds";
rockchip,grf = <&grf>;
reg = <0xff96c000 0x4000>;
clocks = <&cru PCLK_LVDS_PHY>;
clock-names = "pclk_lvds";
pinctrl-names = "lcdc";
pinctrl-0 = <&lcdc_ctl>;
avdd1v0-supply = <&vdd10_lcd>;
avdd1v8-supply = <&vcc18_lcd>;
avdd3v3-supply = <&vcca_33>;
rockchip,output = "rgb";
ports {
#address-cells = <1>;
#size-cells = <0>;

lvds_in: port@0 {
reg = <0>;

lvds_in_vopb: endpoint@0 {
reg = <0>;
remote-endpoint = <&vopb_out_lvds>;
};
lvds_in_vopl: endpoint@1 {
reg = <1>;
remote-endpoint = <&vopl_out_lvds>;
};
};

lvds_out: port@1 {
reg = <1>;

lvds_out_panel: endpoint {
remote-endpoint = <&panel_in_lvds>;
};
};
};
};

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