linux-kernel - Re: [PATCH RFC 1/4] dt-bindings: input: touchscreen: Add Z2 controller bindings.

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Message-ID: <20230227222309.GB1048218-robh@kernel.org>
Date:   Mon, 27 Feb 2023 16:23:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sasha Finkelstein <fnkl.kernel@...il.com>
Cc:     Sven Peter <sven@...npeter.dev>, Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        - <asahi@...ts.linux.dev>, Henrik Rydberg <rydberg@...math.org>,
        linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/4] dt-bindings: input: touchscreen: Add Z2
 controller bindings.

On Fri, Feb 24, 2023 at 12:08:42PM +0100, Sasha Finkelstein wrote:
> On Fri, 24 Feb 2023 at 12:04, Sven Peter <sven@...npeter.dev> wrote:
> > Now that I thought about this again after the brief discussion we already had:
> > Do we even need to specify the device name? Is there any reason we can't just
> > always use something like "Apple Z2 TouchBar"?
> A similar protocol is used for primary touchscreen on idevices, which

Similar? So close, but somehow different.

> need different
> userspace handling. This is to make the driver potentially useful for
> people who run
> linux on checkra1n-able devices.

It is sounding to me like you need different compatibles. Don't try to 
parameterize the differences with properties. Unless you can define all 
the differences up front (hint: you can't).

Rob