linux-kernel - Re: [PATCH 2/9] dt-bindings: arm: mediatek: Add MT8186 Tentacruel / Tentacool Chromebooks

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Date:   Fri, 20 Oct 2023 11:12:49 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Conor Dooley <conor@...nel.org>, Chen-Yu Tsai <wenst@...omium.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] dt-bindings: arm: mediatek: Add MT8186 Tentacruel /
 Tentacool Chromebooks

On 18/10/2023 17:07, Conor Dooley wrote:
>>> Then it seems like what you need is something like
>>> oneOf:
>>>   - items:
>>>       - const: google,tentacruel-sku262144
>>>       - const: google,tentacruel
>>>       - const: mediatek,mt8186
>>>   - items:
>>>       - enum:
>>>           - google,tentacruel-sku262145
>>>           - google,tentacruel-sku262146
>>>           - google,tentacruel-sku262147
>>>       - const: google,tentacruel-sku262144
>>>       - const: google,tentacruel
>>>       - const: mediatek,mt8186
>>>
>>> What you have at the moment just seems like a hack because you want to
>>> stuff all of these compatible strings into a single dts.
>>
>> It is. And it works OK downstream. The reason we want to stuff them in
>> one dts is because the firmware will not generate the fallback to
>> sku262144 as the scheme above suggests.
> 
> I'm not going to ack the hack that you have here, sorry. Maybe Rob or
> Krzysztof will. The list your firmware generates above doesn't even
> match the contents of this patch, with the extra "rev-4" compatibles.

No Acks from me either... Chromebooks board compatibles are a long
standing confusion for me and every time I forget why this is so
counter-intuitively. My comments for changing this were rather receiving
feedback "but our firmware likes it that way".
OTOH, board compatibles just have to be unique, so we could accept some
weird, counter-intuitive combinations... but it does not mean I should
be happy with them.

Best regards,
Krzysztof