linux-kernel - Re: [PATCH 1/2] dt-bindings: soc: mediatek: add mdp3 mutex support for mt8186

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Date:   Fri, 8 Jul 2022 10:19:26 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     "allen-kh.cheng" <allen-kh.cheng@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Project_Global_Chrome_Upstream_Group@...iatek.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        Xiandong Wang <xiandong.wang@...iatek.com>
Subject: Re: [PATCH 1/2] dt-bindings: soc: mediatek: add mdp3 mutex support
 for mt8186



On 08/07/2022 10:14, allen-kh.cheng wrote:
> Hi Angelo,
> 
> On Thu, 2022-07-07 at 12:59 +0200, AngeloGioacchino Del Regno wrote:
>> Il 07/07/22 12:41, Matthias Brugger ha scritto:
>>>
>>>
>>> On 07/07/2022 10:52, AngeloGioacchino Del Regno wrote:
>>>> Il 05/07/22 14:26, Allen-KH Cheng ha scritto:
>>>>> Add mdp3 mutex compatible for mt8186 SoC.
>>>>>
>>>>> Signed-off-by: Allen-KH Cheng <allen-kh.cheng@...iatek.com>
>>>>> Signed-off-by: Xiandong Wang <xiandong.wang@...iatek.com>
>>>>
>>>>
>>>> Please drop this commit. Adding a mdp3-mutex compatible is not
>>>> needed here.
>>>>
>>>
>>> Thanks for checking. We probably would need a fallback compatible.
>>> We can only know
>>> from the HW engineers that can confirm if the IP block is the same
>>> as the disp
>>> mutex or a different one.
>>>
>>> I'll drop both patches for now until things got clear.
>>>
>>
>> They're located in a different iospace from each other, but either
>> the platform
>> data needs to *not be* joined together, or if they're together, I
>> would not like
>> having two different compatible strings for essentially the same
>> thing.
>>
>> I would at this point prefer dropping '-disp' from 'mediatek,mt8186-
>> disp-mutex'
>> so that we would be able to declare two 'mediatek,mt8186-mutex' in
>> devicetree...
>> ...or simply have two mediatek,mt8186-disp-mutex (although logically
>> incorrect?).
>>
>> Cheers,
>> Angelo
>>
> 
> Thanks for your opinion.
> 
> They are two different hardwares for different address spaces.
> 
> I think we drop '-disp' from 'mediatek,mt8186-disp-mutex' will be
> excessive because we also need to modify mutex node in all exited dts
> files.
> 
> I prefer havingg two mediatek,mt8186-disp-mutex.
> 
> ex:
> mutex: mutex@...01000 {
> 	compatible = "mediatek,mt8186-disp-mutex";
> 	..
> }
> 
> mdp3_mutex0: mutex@...01000 {
> 	compatible = "mediatek,mt8186-disp-mutex";
> 	...
> }
> 
> What do you think?

I think that's an acceptable solution.

Regards,
Matthias

> 
> Best regards,
> Allen
> 
>>> Regards,
>>> Matthias
>>>
>>>>> ---
>>>>>   
>>>>> .../devicetree/bindings/soc/mediatek/mediatek,mutex.yaml
>>>>>    | 1 +
>>>>>    1 file changed, 1 insertion(+)
>>>>>
>>>>> diff --git
>>>>> a/Documentation/devicetree/bindings/soc/mediatek/mediatek,mutex
>>>>> .yaml
>>>>> b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mutex
>>>>> .yaml
>>>>> index 627dcc3e8b32..234fa5dc07c2 100644
>>>>> ---
>>>>> a/Documentation/devicetree/bindings/soc/mediatek/mediatek,mutex
>>>>> .yaml
>>>>> +++
>>>>> b/Documentation/devicetree/bindings/soc/mediatek/mediatek,mutex
>>>>> .yaml
>>>>> @@ -30,6 +30,7 @@ properties:
>>>>>          - mediatek,mt8173-disp-mutex
>>>>>          - mediatek,mt8183-disp-mutex
>>>>>          - mediatek,mt8186-disp-mutex
>>>>> +      - mediatek,mt8186-mdp3-mutex
>>>>>          - mediatek,mt8192-disp-mutex
>>>>>          - mediatek,mt8195-disp-mutex
>>>>
>>>>
>>>>
>>
>>
>