linux-kernel - Re: [PATCH v4 1/6] dt-bindings: arm: mediatek: mmsys: change compatible for MT8195

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Date:   Mon, 26 Sep 2022 01:19:57 +0000
From:   Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>
To:     "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        CK Hu (胡俊光) <ck.hu@...iatek.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.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>,
        Rex-BC Chen (陳柏辰) 
        <Rex-BC.Chen@...iatek.com>
Subject: Re: [PATCH v4 1/6] dt-bindings: arm: mediatek: mmsys: change
 compatible for MT8195

Hi Krzysztof,

Thanks for the reviews.

On Sun, 2022-09-25 at 09:52 +0200, Krzysztof Kozlowski wrote:
> On 24/09/2022 10:00, 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     | 5
> > ++++-
> >  1 file changed, 4 insertions(+), 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..4f90ea03c596 100644
> > ---
> > a/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > +++
> > b/Documentation/devicetree/bindings/arm/mediatek/mediatek,mmsys.yam
> > l
> > @@ -31,13 +31,16 @@ properties:
> >                - mediatek,mt8183-mmsys
> >                - mediatek,mt8186-mmsys
> >                - mediatek,mt8192-mmsys
> > -              - mediatek,mt8195-mmsys
> 
> We keep making circles...

I didn't find the sample of "deprecated" in the example-schema.yaml,
so I keep misunderstand what you mean.
I'm sorry about that...

> 
> I asked "and why mediatek,mt8195-mmsys is kept as non-deprecated?"
> 
Yes, it should be deprecated. I shouldn't remove it...

> and your response is to remove it... Eh, okay, that's fine but now
> your
> change causes now warnings in existing DTS. Either you keep old entry
> as
> deprecated (just git grep for deprecated, you will find examples how
> to
> do it) or fix the DTS.
> 
Thanks for the advice.

Now I found an example in other yaml, so I just added the "deprecated"
tag like this, right?

 - items:
          - enum:
              - mediatek,mt2701-mmsys
              - mediatek,mt2712-mmsys
              - mediatek,mt6765-mmsys
              - mediatek,mt6779-mmsys
              - mediatek,mt6797-mmsys
              - mediatek,mt8167-mmsys
              - mediatek,mt8173-mmsys
              - mediatek,mt8183-mmsys
              - mediatek,mt8186-mmsys
              - mediatek,mt8192-mmsys
              - mediatek,mt8195-mmsys
                  deprecated: true
              - mediatek,mt8365-mmsys
          - const: syscon

Regard,
Jason-JH.Lin

> Best regards,
> Krzysztof
>