linux-kernel - Re: [PATCH 3/6] dt-bindings: arm64: dts: mediatek: Add mt8183-kukui-jacuzzi-makomo

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Date:   Wed, 25 Oct 2023 15:49:28 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Nícolas F . R . A . Prado 
        <nfraprado@...labora.com>,
        Bernhard Rosenkränzer <bero@...libre.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Macpaul Lin <macpaul.lin@...iatek.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
Subject: Re: [PATCH 3/6] dt-bindings: arm64: dts: mediatek: Add
 mt8183-kukui-jacuzzi-makomo

On Tue, Oct 24, 2023 at 11:22:00AM -0700, Hsin-Yi Wang wrote:
> On Tue, Oct 24, 2023 at 8:17 AM Conor Dooley <conor@...nel.org> wrote:
> >
> > On Mon, Oct 23, 2023 at 05:02:26PM -0700, Hsin-Yi Wang wrote:
> > > Add makomo sku0 and sku1 which uses different audio codec.
> > >
> > > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > > ---
> > >  Documentation/devicetree/bindings/arm/mediatek.yaml | 12 ++++++++++++
> > >  1 file changed, 12 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/arm/mediatek.yaml b/Documentation/devicetree/bindings/arm/mediatek.yaml
> > > index fe8c488a3207..b131e0bdbf01 100644
> > > --- a/Documentation/devicetree/bindings/arm/mediatek.yaml
> > > +++ b/Documentation/devicetree/bindings/arm/mediatek.yaml
> > > @@ -250,6 +250,18 @@ properties:
> > >                - google,kodama-sku32
> > >            - const: google,kodama
> > >            - const: mediatek,mt8183
> > > +      - description: Google Makomo (Lenovo 100e Chromebook 2nd Gen MTK 2)
> > > +        items:
> > > +          - const: google,makomo-rev4-sku0
> > > +          - const: google,makomo-rev5-sku0
> >
> > With these bindings, how does one describe a makomo-rev5-sku0?
> > What you have here is only suitable for describing the makomo-rev4-sku0.
> >
> makomo-rev5-sku0 and makomo-rev4-sku0 uses the same dts:
> 
> compatible = "google,makomo-rev4-sku0", "google,makomo-rev5-sku0",
>                       "google,makomo", "mediatek,mt8183";
> 
> In this case, can bindings be listed like that?

On a rev5-sku0, the first compatible should be the most specific one,
which would mean:

compatible = "google,makomo-rev5-sku0", "google,makomo", "mediatek,mt8183";

I said the same on other google laptop bindings before, but I'm not
really happy with these compatible configurations, that seem conjured up
to suit your firmware. It'd make far more sense to me to have a setup
that permitted:
compatible = "google,makomo-sku0-rev5", "google,makomo-sku0", "google,makomo", "mediatek,mt8183";
and
compatible = "google,makomo-sku0-rev4", "google,makomo-sku0", "google,makomo", "mediatek,mt8183";

Cheers,
Conor.

> > > +          - const: google,makomo
> > > +          - const: mediatek,mt8183
> > > +      - description: Google Makomo (Lenovo 100e Chromebook 2nd Gen MTK 2)
> > > +        items:
> > > +          - const: google,makomo-rev4-sku1
> > > +          - const: google,makomo-rev5-sku1
> > > +          - const: google,makomo
> > > +          - const: mediatek,mt8183
> > >        - description: Google Willow (Acer Chromebook 311 C722/C722T)
> > >          items:
> > >            - enum:
> > > --
> > > 2.42.0.758.gaed0368e0e-goog
> > >

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