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

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Message-ID: <8b010e16175217d0668b97e206c5059c59e6e414.camel@mediatek.com>
Date: Fri, 13 Dec 2024 06:22:47 +0000
From: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
To: "treapking@...omium.org" <treapking@...omium.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Singo Chang (張興國) <Singo.Chang@...iatek.com>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Shawn Sung (宋孝謙) <Shawn.Sung@...iatek.com>,
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"robh@...nel.org" <robh@...nel.org>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 1/2] dt-bindings: display: mediatek: ovl: Modify rules for
 MT8195/MT8188

Hi Pin-yen,

Thanks for the reviews.

On Fri, 2024-12-13 at 11:41 +0800, Pin-yen Lin wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> 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.y
> > aml
> > b/Documentation/devicetree/bindings/display/mediatek/mediatek,ovl.y
> > aml
> > index 9ea796a033b2..0ace12bbb623 100644
> > ---
> > a/Documentation/devicetree/bindings/display/mediatek/mediatek,ovl.y
> > aml
> > +++
> > b/Documentation/devicetree/bindings/display/mediatek/mediatek,ovl.y
> > aml
> > @@ -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"`.
> 

Yes, I lost the "mediatek,mt8195-disp-ovl" in [1] at the beginning of
compatible property.
I'll add it to the next version.

> 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.

Yes, I think the OVL in mt8195.dtsi should remove the "mediatek,mt8183-
disp-ovl" because it's not compatible anymore.

I'll add that path in the same series.

Regards,
Jason-JH.Lin