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From:   Doug Anderson <dianders@chromium.org>
Date:   Wed, 15 Nov 2023 12:44:25 -0800
Message-ID: <CAD=FV=X-17COQ2-tycV1bSuCrGy7MJ88Un8nA-a-ODexvgi9TQ@mail.gmail.com>
Subject: Re: [RFC PATCH v2 0/7] of: Introduce hardware prober driver
To:     Rob Herring <robh+dt@kernel.org>
Cc:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Chen-Yu Tsai <wenst@chromium.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        andriy.shevchenko@linux.intel.com, Jiri Kosina <jikos@kernel.org>,
        linus.walleij@linaro.org, broonie@kernel.org,
        gregkh@linuxfoundation.org, hdegoede@redhat.com,
        james.clark@arm.com, james@equiv.tech, keescook@chromium.org,
        petr.tesarik.ext@huawei.com, rafael@kernel.org, tglx@linutronix.de,
        Jeff LaBundy <jeff@labundy.com>, linux-input@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org,
        Johan Hovold <johan@kernel.org>
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Hi,

On Wed, Nov 15, 2023 at 2:28=E2=80=AFPM Rob Herring <robh+dt@kernel.org> wr=
ote:
>
> > So if we're searching the whole device tree for "failed-needs-probe"
> > then we need to figure out which devices are related to each other. If
> > a given board has second sources for MIPI panels, touchscreens, and
> > trackpads then we need to know which of the "failed-needs-probe"
> > devices are trackpads, which are touchscreens, and which are MIPI
> > panels. Do you have any suggestions for how we should do that? Maybe
> > it was in some other thread that I missed? I guess we could have a
> > board-specific table mapping (compatible + node name + reg) to a
> > class, but that feels awkward.
>
> Node name is supposed to correspond to device class, so why not use
> that (no path or unit-address.) and nothing else (well, besides
> "status")?

One problem is that I could imagine having two second source trackpads
that both have the same i2c address. That would give them the same
name, right? I guess you could maybe come up with some sort of suffix
rule? Like

trackpad-1@10 {
  compatible =3D "elan,blah";
  ret =3D <0x10>;
  status =3D "failed-needs-probe";
  ...
}
trackpad-2@10 {
  compatible =3D "goodix,gt7375p";
  ret =3D <0x10>;
  status =3D "failed-needs-probe";
  ...
}

Then I guess the class would be "trackpad"?


-Doug