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

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Message-ID: <CAGXv+5HQkTUVXVDsHjy-T+iDU3Lr-K1sPeMA5EnzvHJxg8fkYg@mail.gmail.com>
Date:   Mon, 27 Nov 2023 10:23:02 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Conor Dooley <conor@...nel.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 Fri, Nov 24, 2023 at 10:09 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Fri, Oct 13, 2023 at 07:02:28AM +0800, Chen-Yu Tsai wrote:
> > Add entries for MT8186 based Tentacruel / Tentacool Chromebooks. The two
> > are based on the same board design: the former is a convertible device
> > with a touchscreen, stylus, and some extra buttons; the latter is a
> > clamshell device and lacks these additional features.
> >
> > The two devices both have two variants. The difference is a second
> > source touchpad controller that shares the same address as the original,
> > but is incompatible.
> >
> > The extra SKU IDs for the Tentacruel devices map to different sensor
> > components attached to the Embedded Controller. These are not visible
> > to the main processor.
> >
> > Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
>
> I had a chat with Doug at Plumbers about the limitations of your
> firmware. As a result, I am fine with acking this if you switch the
> order of the sku compatibles to be in descending order.

Thank you for taking the effort to understand our weird firmware
implementation. And a thank you to Doug for discussing this. I'll
send out the next version shortly.

> The firmware can handle that, right?

Yes. The firmware basically takes a list of machine compatibles, and
runs them against all the DTs it has with of_machine_is_compatible().

Thanks
ChenYu

>
> Cheers,
> Conor.
>
> > ---
> >  .../devicetree/bindings/arm/mediatek.yaml     | 26 +++++++++++++++++++
> >  1 file changed, 26 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/arm/mediatek.yaml b/Documentation/devicetree/bindings/arm/mediatek.yaml
> > index 60337b439744..aa7e6734b336 100644
> > --- a/Documentation/devicetree/bindings/arm/mediatek.yaml
> > +++ b/Documentation/devicetree/bindings/arm/mediatek.yaml
> > @@ -206,6 +206,32 @@ properties:
> >            - enum:
> >                - mediatek,mt8183-pumpkin
> >            - const: mediatek,mt8183
> > +      - description: Google Tentacruel (ASUS Chromebook CM14 Flip CM1402F)
> > +        items:
> > +          - const: google,tentacruel-sku262144
> > +          - const: google,tentacruel-sku262145
> > +          - const: google,tentacruel-sku262146
> > +          - const: google,tentacruel-sku262147
> > +          - const: google,tentacruel
> > +          - const: mediatek,mt8186
> > +      - description: Google Tentacruel (ASUS Chromebook CM14 Flip CM1402F)
> > +        items:
> > +          - const: google,tentacruel-sku262148
> > +          - const: google,tentacruel-sku262149
> > +          - const: google,tentacruel-sku262150
> > +          - const: google,tentacruel-sku262151
> > +          - const: google,tentacruel
> > +          - const: mediatek,mt8186
> > +      - description: Google Tentacool (ASUS Chromebook CM14 CM1402C)
> > +        items:
> > +          - const: google,tentacruel-sku327681
> > +          - const: google,tentacruel
> > +          - const: mediatek,mt8186
> > +      - description: Google Tentacool (ASUS Chromebook CM14 CM1402C)
> > +        items:
> > +          - const: google,tentacruel-sku327683
> > +          - const: google,tentacruel
> > +          - const: mediatek,mt8186
> >        - items:
> >            - enum:
> >                - mediatek,mt8186-evb
> > --
> > 2.42.0.655.g421f12c284-goog
> >