linux-kernel - Re: [PATCH 7/7] dt-bindings: display: add panel-timing property to sitronix,st7789v

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Date:   Thu, 16 Mar 2023 16:57:35 -0500
From:   Rob Herring <robh@...nel.org>
To:     Gerald Loacker <gerald.loacker@...fvision.net>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Maxime Ripard <mripard@...nel.org>,
        Michael Riesch <michael.riesch@...fvision.net>
Subject: Re: [PATCH 7/7] dt-bindings: display: add panel-timing property to
 sitronix,st7789v

On Tue, Mar 14, 2023 at 12:56:44PM +0100, Gerald Loacker wrote:
> The sitronix-st7789v driver now considers the panel-timing property.

I read the patch for that and still don't know 'why'. Commit messages 
should answer why.

> Add the property to the documentation.

We generally don't put timings in DT for panels. Why is this one 
special?

> 
> Signed-off-by: Gerald Loacker <gerald.loacker@...fvision.net>
> ---
>  .../display/panel/sitronix,st7789v.yaml         | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml b/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
> index ed942cd3620f..8810f123dedf 100644
> --- a/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
> +++ b/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
> @@ -21,6 +21,7 @@ properties:
>    reset-gpios: true
>    power-supply: true
>    backlight: true
> +  panel-timing: true
>    port: true
>    rotation: true
>  
> @@ -54,6 +55,22 @@ examples:
>              spi-cpol;
>              spi-cpha;
>  
> +            panel-timing {
> +                clock-frequency = <7000000>;
> +                hactive = <240>;
> +                vactive = <320>;
> +                hfront-porch = <38>;
> +                hback-porch = <10>;
> +                hsync-len = <10>;
> +                vfront-porch = <8>;
> +                vback-porch = <4>;
> +                vsync-len = <4>;
> +                hsync-active = <1>;
> +                vsync-active = <1>;
> +                de-active = <1>;
> +                pixelclk-active = <1>;
> +            };
> +
>              port {
>                  panel_input: endpoint {
>                      remote-endpoint = <&tcon0_out_panel>;
> -- 
> 2.37.2
>