linux-kernel - Re: [PATCH v2 1/2] dt-bindings: arm64: dts: mediatek: add mt8395-evk board

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Date:   Wed, 6 Sep 2023 12:48:17 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Macpaul Lin <macpaul.lin@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Bernhard Rosenkränzer <bero@...libre.com>,
        Sean Wang <sean.wang@...iatek.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Cc:     Bear Wang <bear.wang@...iatek.com>,
        Pablo Sun <pablo.sun@...iatek.com>,
        Macpaul Lin <macpaul@...il.com>
Subject: Re: [PATCH v2 1/2] dt-bindings: arm64: dts: mediatek: add mt8395-evk
 board

Il 06/09/23 11:53, Macpaul Lin ha scritto:
> 
> 
> On 9/6/23 17:32, Krzysztof Kozlowski wrote:
>>
>>
>> External email : Please do not click links or open attachments until you have 
>> verified the sender or the content.
>>
>> On 06/09/2023 11:25, Macpaul Lin wrote:
>>> 1. Add compatible for MT8395.
>>> 2. Add bindings for the MediaTek mt8395-evk board, also known
>>> as the "Genio 1200-EVK".
>>>
>>> The MT8195 and MT8395 belong to the same SoC family,
>>> with only minor differences in their physical characteristics.
>>> They utilize unique efuse values for differentiation.
>>>
>>> The booting process and configurations are managed by boot
>>> loaders, firmware, and TF-A. Consequently, the part numbers
>>> and procurement channels vary.
>>>
>>> Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
>>> ---
>>>  Documentation/devicetree/bindings/arm/mediatek.yaml | 5 +++++
>>>  1 file changed, 5 insertions(+)
>>
>> Do not attach (thread) your patchsets to some other threads (unrelated
>> or older versions). This buries them deep in the mailbox and might
>> interfere with applying entire sets.
>>
>>>
>>> Changes for v2:
>>>  - add more detail description for mt8395.
>>>  - add bindings for mt8395, and mt8395-evk.
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/mediatek.yaml 
>>> b/Documentation/devicetree/bindings/arm/mediatek.yaml
>>> index ae12b1cab9fb..d7a20df640d7 100644
>>> --- a/Documentation/devicetree/bindings/arm/mediatek.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/mediatek.yaml
>>> @@ -248,6 +248,11 @@ properties:
>>>            - enum:
>>>                - mediatek,mt8365-evk
>>>            - const: mediatek,mt8365
>>> +      - description: MediaTek Genio 1200 Boards (Genio 1200 EVK)
>>> +        items:
>>> +          - enum:
>>> +              - mediatek,mt8395-evk
>>> +          - const: mediatek,mt8395
>>
>>
>> I don't understand. You said last time this is fully compatible with
>> mt8195, so why it's not here?
>>
> 
> Yes, mt8395 is fully compatible with mt8195.
> 
> But after reading Angelo's comment, we thought it is necessary to create a new 
> compatible to avoid confusion for users.
> https://lore.kernel.org/lkml/bf8394c6-5460-8696-f46b-0c39927aaf84@collabora.com/
> 
> Although they are fully compatible, developers cannot arbitrarily replace the chip 
> on the board with another one. So separated bindings might be better.

Sorry you've misunderstood; I was trying to explain to Krzysztof that the two
SoCs are fully compatible... my suggestion was in like with what you're trying to
do as in I am agreeing with your first version, Macpaul, to inherit MT8195.

So,

- enum
     - mediatek,mt8395-evk
- const: mediatek,mt8195
- const: mediatek,mt8395

> 
>> Best regards,
>> Krzysztof
> 
> Thanks
> Macpaul Lin