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

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Message-ID: <dfec9514-e105-5083-2d72-625dc05c4a21@linaro.org>
Date:   Mon, 26 Sep 2022 08:40:01 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "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

On 26/09/2022 03:19, Jason-JH Lin (林睿祥) wrote:
> 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

No, you need oneOf. You used git grep, good. Now use second command -
git log -p - to see how it was exactly added...

Best regards,
Krzysztof