linux-kernel - Re: [PATCH v3 1/6] dt-bindings: arm: mediatek: mmsys: change compatible for MT8195

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Message-ID: <8fba20bf37326504b871fb55ce171cd37720a9a0.camel@mediatek.com>
Date:   Wed, 21 Sep 2022 12:16:58 +0800
From:   Jason-JH Lin <jason-jh.lin@...iatek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     CK Hu <ck.hu@...iatek.com>, Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v3 1/6] dt-bindings: arm: mediatek: mmsys: change
 compatible for MT8195

Hi Krzysztof,

Thanks for the reviews.

On Tue, 2022-09-20 at 17:25 +0200, Krzysztof Kozlowski wrote:
> On 20/09/2022 16:01, Jason-JH.Lin wrote:
> > For previous MediaTek SoCs, such as MT8173, there are 2 display HW
> > pipelines binding to 1 mmsys with the same power domain, the same
> > clock driver and the same mediatek-drm driver.
> > 
> > For MT8195, VDOSYS0 and VDOSYS1 are 2 display HW pipelines binding
> > to
> > 2 different power domains, different clock drivers and different
> > mediatek-drm drivers.
> > 
> > Moreover, Hardware pipeline of VDOSYS0 has these components: COLOR,
> > CCORR, AAL, GAMMA, DITHER. They are related to the PQ (Picture
> > Quality)
> > and they makes VDOSYS0 supports PQ function while they are not
> > including in VDOSYS1.
> > 
> > Hardware pipeline of VDOSYS1 has the component ETHDR (HDR related
> > component). It makes VDOSYS1 supports the HDR function while it's
> > not
> > including in VDOSYS0.
> > 
> > To summarize0:
> > Only VDOSYS0 can support PQ adjustment.
> > Only VDOSYS1 can support HDR adjustment.
> > 
> > Therefore, we need to separate these two different mmsys hardwares
> > to
> > 2 different compatibles for MT8195.
> > 
> > Fixes: 81c5a41d10b9 ("dt-bindings: arm: mediatek: mmsys: add mt8195
> > SoC binding")
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
> > ---
> >  .../devicetree/bindings/arm/mediatek/mediatek,mmsys.yaml      | 4
> > ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > index 6ad023eec193..df9184b6772c 100644
> > ---
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > +++
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > @@ -38,6 +38,10 @@ properties:
> >            - const: mediatek,mt7623-mmsys
> >            - const: mediatek,mt2701-mmsys
> >            - const: syscon
> > +      - items:
> > +          - const: mediatek,mt8195-vdosys0
> > +          - const: mediatek,mt8195-mmsys
> > +          - const: syscon
> 
> and why mediatek,mt8195-mmsys is kept as non-deprecated?

Shouldn't we keep this for fallback compatible?

I think this items could support the device node like:
foo {
  compatible = "mediatek,mt8195-vdosys0", "mediatek,mt8195-mmsys", 
	       "syscon";
}


Or should I change the items like this?
- items:
    - const: mediatek,mt8195-vdosys0
    - enum:
        - mediatek,mt8195-mmsys
    - const: syscon


Regards,
Jason-JH.Lin

> 
> Best regards,
> Krzysztof
> 
-- 
Jason-JH Lin <jason-jh.lin@...iatek.com>