linux-kernel - Re: [PATCH v5 1/3] dt-bindings: display: Add Document for Rockchip Soc LVDS

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Message-ID: <20170817205622.s7ivkxu7uac5rnwa@rob-hp-laptop>
Date:   Thu, 17 Aug 2017 15:56:22 -0500
From:   Rob Herring <robh@...nel.org>
To:     Sandy Huang <hjc@...k-chips.com>
Cc:     Mark Yao <mark.yao@...k-chips.com>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Heiko Stuebner <heiko@...ech.de>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/3] dt-bindings: display: Add Document for Rockchip
 Soc LVDS

On Tue, Aug 15, 2017 at 11:49:19AM +0800, Sandy Huang wrote:
> This patch add Document for Rockchip Soc RK3288 LVDS,
> This based on the patches from Mark yao and Heiko Stuebner.
> 
> Signed-off-by: Sandy Huang <hjc@...k-chips.com>
> Signed-off-by: Mark yao <mark.yao@...k-chips.com>
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> ---
> Changes according to Mark Yao reviews.
> 
>  .../bindings/display/rockchip/rockchip-lvds.txt    | 105 +++++++++++++++++++++
>  1 file changed, 105 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt b/Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt
> new file mode 100644
> index 0000000..c153411
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt
> @@ -0,0 +1,105 @@
> +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
> +
> +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 inputs
> +- 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:
> +- rockchip,data-width : should be <18> or <24>;
> +- rockchip,output: should be "rgb", "lvds" or "duallvds",
> +	This describes the output face.

These either aren't needed or shouldn't be Rockchip specific. Probably 
the former because no one else has them so far.

> +- ports for remote LVDS output
> +
> +Panel optional properties:
> +- rockchip,data-mapping: should be "vesa" or "jeida",
> +	This describes how the color bits are laid out in the
> +	serialized LVDS signal.

There's a common property for this.

> +Example:
> +
> +lvds_panel: lvds-panel {
> +	status = "okay";
> +	compatible = "simple-panel";

Not a valid compatible. simple-panel is more a driver, than a binding.

> +	enable-gpios = <&gpio7 21 GPIO_ACTIVE_HIGH>;
> +	rockchip,data-mapping = "jeida";
> +	rockchip,data-width = <24>;
> +	rockchip,output = "rgb";
> +
> +	ports {
> +		panel_in_lvds: endpoint {
> +			remote-endpoint = <&lvds_out_panel>;
> +		};
> +	};
> +};
> +
> +For Rockchip RK3288:
> +
> +	lvds: lvds@...6c000 {
> +		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,data-mapping = "jeida";
> +		rockchip,data-width = <24>;
> +		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>;
> +				};
> +			};
> +		};
> +	};
> -- 
> 2.7.4
> 
>