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Date:   Mon, 26 Sep 2022 08:40:01 +0200
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Subject: Re: [PATCH v4 1/6] dt-bindings: arm: mediatek: mmsys: change
 compatible for MT8195
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To:     =?UTF-8?B?SmFzb24tSkggTGluICjmnpfnnb/npaUp?= 
        <Jason-JH.Lin@mediatek.com>,
        "matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
        "chunkuang.hu@kernel.org" <chunkuang.hu@kernel.org>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "krzysztof.kozlowski+dt@linaro.org" 
        <krzysztof.kozlowski+dt@linaro.org>,
        "angelogioacchino.delregno@collabora.com" 
        <angelogioacchino.delregno@collabora.com>
Cc:     "linux-mediatek@lists.infradead.org" 
        <linux-mediatek@lists.infradead.org>,
        =?UTF-8?B?U2luZ28gQ2hhbmcgKOW8teiIiOWciyk=?= 
        <Singo.Chang@mediatek.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        =?UTF-8?B?TmFuY3kgTGluICjmnpfmrKPonqIp?= <Nancy.Lin@mediatek.com>,
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        <Project_Global_Chrome_Upstream_Group@mediatek.com>,
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        <linux-arm-kernel@lists.infradead.org>,
        =?UTF-8?B?UmV4LUJDIENoZW4gKOmZs+afj+i+sCk=?= 
        <Rex-BC.Chen@mediatek.com>
References: <20220924080058.20566-1-jason-jh.lin@mediatek.com>
 <20220924080058.20566-2-jason-jh.lin@mediatek.com>
 <6bbe9527-ae48-30e0-fb45-519223a744d7@linaro.org>
 <23fd466265eec1effd83de6e8ad4ff64eadf5cae.camel@mediatek.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <23fd466265eec1effd83de6e8ad4ff64eadf5cae.camel@mediatek.com>
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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@mediatek.com>
>>> Signed-off-by: Bo-Chen Chen <rex-bc.chen@mediatek.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