linux-kernel - Re: [PATCH 6/9] arm64: dts: mediatek: Add MT8186 Krabby platform based Tentacruel / Tentacool

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Message-ID: <CAGXv+5EY_vfX+cNZ4QH++fH0uRBJ_hEK5mQpRAJbbsisXWBaNQ@mail.gmail.com>
Date:   Mon, 16 Oct 2023 10:12:18 -0700
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Eugen Hristev <eugen.hristev@...labora.com>
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 6/9] arm64: dts: mediatek: Add MT8186 Krabby platform
 based Tentacruel / Tentacool

On Mon, Oct 16, 2023 at 2:21 AM Eugen Hristev
<eugen.hristev@...labora.com> wrote:
>
> On 10/13/23 02:02, Chen-Yu Tsai wrote:
> > Tentacruel and Tentacool are MT8186 based Chromebooks based on the
> > Krabby design.
> >
> > Tentacruel, also known as the ASUS Chromebook CM14 Flip CM1402F, is a
> > convertible device with touchscreen and stylus.
> >
> > Tentacool, also known as the ASUS Chromebook CM14 CM1402C, is a laptop
> > device. It does not have a touchscreen or stylus.
> >
>
> Hi Chen-Yu,
>
> The Krabby design has the touchscreen ? if the touchscreen is for
> Tentacruel ,then the touchscreen should be described in the tentacruel
> dtsi, not in the Krabby and then deleted for tentacool.

Yes. The Krabby design is the reference design and has all the bells and
whistles. Vendors can choose to drop features for their market segmenting
purposes.

In essence the vendors are taking a Google design and tweaking it to suite
their needs. Sometimes things get deleted. Deleting the node seems like
a proper way to describe it.

ChenYu

> Or is there any reason for describing the touchscreen for Krabby ?
> One additional way to solve this is to have the touchsreen as separate
> dtsi and only include it for the boards that have it, e.g. tentacruel .
> Eugen
> > 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.
> >
> [...]
>