linux-kernel - Re: [PATCH 1/2] dt-bindings: display: mediatek: ovl: Modify rules for MT8195/MT8188

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Message-ID: <CAEXTbpfc0ybrvMCuJkKAUwXXTtpZ=vU9MLfU=4CzgdTd-ck4qw@mail.gmail.com>
Date: Fri, 13 Dec 2024 11:41:41 +0800
From: Pin-yen Lin <treapking@...omium.org>
To: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
Cc: Chun-Kuang Hu <chunkuang.hu@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org, 
	Singo Chang <singo.chang@...iatek.com>, linux-kernel@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, 
	Project_Global_Chrome_Upstream_Group@...iatek.com, 
	Nancy Lin <nancy.lin@...iatek.com>, linux-mediatek@...ts.infradead.org, 
	Shawn Sung <shawn.sung@...iatek.com>, Matthias Brugger <matthias.bgg@...il.com>, 
	linux-arm-kernel@...ts.infradead.org, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 1/2] dt-bindings: display: mediatek: ovl: Modify rules for MT8195/MT8188

Hi Jason,

On Thu, Dec 12, 2024 at 11:33 PM Jason-JH.Lin <jason-jh.lin@...iatek.com> wrote:
>
> From: Hsiao Chien Sung <shawn.sung@...iatek.com>
>
> Modify rules for both MT8195 and MT8188.
> Hardware capabilities include color formats and AFBC are
> changed since MT8195, stop using the settings of MT8183.
>
> Acked-by: Rob Herring <robh@...nel.org>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> Reviewed-by: CK Hu <ck.hu@...iatek.com>
> ---
>  .../bindings/display/mediatek/mediatek,ovl.yaml           | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/display/mediatek/mediatek,ovl.yaml b/Documentation/devicetree/bindings/display/mediatek/mediatek,ovl.yaml
> index 9ea796a033b2..0ace12bbb623 100644
> --- a/Documentation/devicetree/bindings/display/mediatek/mediatek,ovl.yaml
> +++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,ovl.yaml
> @@ -36,16 +36,14 @@ properties:
>            - enum:
>                - mediatek,mt6795-disp-ovl
>            - const: mediatek,mt8173-disp-ovl
> -      - items:
> -          - enum:
> -              - mediatek,mt8188-disp-ovl
> -              - mediatek,mt8195-disp-ovl
> -          - const: mediatek,mt8183-disp-ovl

This breaks the schema check for mt8195.dtsi, which is currently using
`compatible = "mediatek,mt8195-disp-ovl", "mediatek,mt8183-disp-ovl";`

IIUC this is supposed to be a RESEND of [1], which actually added a
binding for "mediatek,mt8195-disp-ovl". However [1] still breaks
mt8195.dtsi because it only allows `compatible =
"mediatek,mt8195-disp-ovl"` But not `compatible =
"mediatek,mt8195-disp-ovl", "mediatek,mt8183-disp-ovl"`.

If "mediatek,mt8183-disp-ovl" is a reasonable fallback for
"mediatek,mt8195-disp-ovl", please keep a binding like:

      - items:
          - const: mediatek,mt8195-disp-ovl
          - const: mediatek,mt8183-disp-ovl

Or, fix mt8195.dtsi instead in the same series.

[1]: https://patchwork.kernel.org/project/linux-mediatek/patch/20231212121957.19231-4-shawn.sung@mediatek.com/
>        - items:
>            - enum:
>                - mediatek,mt8186-disp-ovl
>                - mediatek,mt8365-disp-ovl
>            - const: mediatek,mt8192-disp-ovl
> +      - items:
> +          - const: mediatek,mt8188-disp-ovl
> +          - const: mediatek,mt8195-disp-ovl
>
>    reg:
>      maxItems: 1

Regards,
Pin-yen