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SubjectRe: [PATCH/RFC 03/12] dt-bindings: panel: lvds: Add dual-link LVDS display support
Hi Fabrizio,

Thank you for the patch.

On Fri, Aug 02, 2019 at 08:34:00AM +0100, Fabrizio Castro wrote:
> Dual-link LVDS displays have two ports, therefore document this
> with the bindings.
>
> Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
> ---
> .../bindings/display/panel/panel-lvds.txt | 91 ++++++++++++++++------
> 1 file changed, 67 insertions(+), 24 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/display/panel/panel-lvds.txt b/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
> index 250850a..07795441 100644
> --- a/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
> +++ b/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
> @@ -41,7 +41,8 @@ Required nodes:
>
> - panel-timing: See panel-common.txt.
> - ports: See panel-common.txt. These bindings require a single port subnode
> - corresponding to the panel LVDS input.
> + (for a single link display) or two port subnodes (for a dual link display)
> + corresponding to the panel LVDS input(s).

I think you should expand this a bit to explain what the ports
correspond to in the dual link mode.

> LVDS data mappings are defined as follows.
> @@ -92,30 +93,72 @@ CTL3: 0
> Example
> -------
>
> -panel {
> - compatible = "mitsubishi,aa121td01", "panel-lvds";
> -
> - width-mm = <261>;
> - height-mm = <163>;
> -
> - data-mapping = "jeida-24";
> -
> - panel-timing {
> - /* 1280x800 @60Hz */
> - clock-frequency = <71000000>;
> - hactive = <1280>;
> - vactive = <800>;
> - hsync-len = <70>;
> - hfront-porch = <20>;
> - hback-porch = <70>;
> - vsync-len = <5>;
> - vfront-porch = <3>;
> - vback-porch = <15>;
> +Single port:
> + panel {
> + compatible = "mitsubishi,aa121td01", "panel-lvds";
> +
> + width-mm = <261>;
> + height-mm = <163>;
> +
> + data-mapping = "jeida-24";
> +
> + panel-timing {
> + /* 1280x800 @60Hz */
> + clock-frequency = <71000000>;
> + hactive = <1280>;
> + vactive = <800>;
> + hsync-len = <70>;
> + hfront-porch = <20>;
> + hback-porch = <70>;
> + vsync-len = <5>;
> + vfront-porch = <3>;
> + vback-porch = <15>;
> + };
> +
> + port {
> + panel_in: endpoint {
> + remote-endpoint = <&lvds_encoder>;
> + };
> + };
> };
>
> - port {
> - panel_in: endpoint {
> - remote-endpoint = <&lvds_encoder>;
> +Two ports:
> + panel {
> + compatible = "advantech,idk-2121wr", "panel-lvds";
> +
> + width-mm = <476>;
> + height-mm = <268>;
> +
> + data-mapping = "vesa-24";
> +
> + panel-timing {
> + clock-frequency = <148500000>;
> + hactive = <1920>;
> + vactive = <1080>;
> + hsync-len = <44>;
> + hfront-porch = <88>;
> + hback-porch = <148>;
> + vfront-porch = <4>;
> + vback-porch = <36>;
> + vsync-len = <5>;
> + };
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> + lvds0_panel_in: endpoint {

I would name the label panel_in0 and panel_in1 below to have a common
prefix showing that both refer to the same panel.

> + remote-endpoint = <&lvds0_out>;
> + };
> + };
> +
> + port@1 {
> + reg = <1>;
> + lvds1_panel_in: endpoint {
> + remote-endpoint = <&lvds1_out>;
> + };
> + };
> };
> };
> -};

--
Regards,

Laurent Pinchart

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