linux-kernel - Re: [PATCH v2 1/6] dt-bindings: arm: mediatek: mmsys: change compatible for MT8195

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Message-ID: <871b6996647bdc71723569a56e7f238f325fa9c7.camel@mediatek.com>
Date:   Mon, 19 Sep 2022 09:26:35 +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 v2 1/6] dt-bindings: arm: mediatek: mmsys: change
 compatible for MT8195

Hi Krzysztof,

Thanks for the reviews.

On Sun, 2022-09-18 at 10:31 +0100, Krzysztof Kozlowski wrote:
> On 16/09/2022 04:34, Jason-JH Lin wrote:
> > Hi Matthias,
> > 
> > Thanks for the review.
> > 
> > On Fri, 2022-09-16 at 00:05 +0200, Matthias Brugger wrote:
> > > 
> > > On 15/09/2022 18:18, 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       
> > > >  |
> > > > 2 +-
> > > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > > 
> > > > diff --git
> > > > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys
> > > > .yam
> > > > l
> > > > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys
> > > > .yam
> > > > l
> > > > index 6ad023eec193..0e267428eaa6 100644
> > > > ---
> > > > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys
> > > > .yam
> > > > l
> > > > +++
> > > > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys
> > > > .yam
> > > > l
> > > > @@ -31,7 +31,7 @@ properties:
> > > >                 - mediatek,mt8183-mmsys
> > > >                 - mediatek,mt8186-mmsys
> > > >                 - mediatek,mt8192-mmsys
> > > > -              - mediatek,mt8195-mmsys
> > > > +              - mediatek,mt8195-vdosys0
> > > 
> > > Nack, we miss the fallback compatible, as I already said twice.
> > > 
> > > Regards,
> > > Matthias
> > 
> > I'm sorry this happened again.
> > I'll keep the compatible "mediatek,mt8195-mmsys" at next version.
> > 
> > The patch "dt-bindings: arm: mediatek: mmsys: remove the unused
> > compatible for mt8195" should be sent after accepting the vdosys1
> > series, right?
> 
> I don't think there will be no such patch...
> 
> You need to add a bindings change which will accept device nodes
> like:
> foo {
>   compatible = "mediatek,mt8195-vdosys0", "mediatek,mt8195-mmsys";
> 
> }
> 
> Example-schema shows how to do it.

OK, I got the point!
I'll fix it at the next version.
Thank you very much!

Regards,
Jason-JH.Lin

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