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

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Message-ID: <318016c7-8ceb-4c96-8784-597fac8d194b@collabora.com>
Date:   Mon, 16 Oct 2023 12:21:55 +0300
From:   Eugen Hristev <eugen.hristev@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        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>
Cc:     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 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.

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.
> 
[...]