linux-kernel - Re: [PATCH v5 3/3] arm64: dts: qcom: Add touchscreen and touchpad support for evoker

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Date:   Fri, 30 Sep 2022 09:25:40 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Sheng-Liang Pan <sheng-liang.pan@...nta.corp-partner.google.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v5 3/3] arm64: dts: qcom: Add touchscreen and touchpad
 support for evoker

Hi,

On Fri, Sep 30, 2022 at 12:38 AM Sheng-Liang Pan
<sheng-liang.pan@...nta.corp-partner.google.com> wrote:
>
> Change touchpad and touchscreen node for evoker
> Touchpad: SA461D-1011
> Touchscreen: GT7986U

[...cut...]

> +       touchscreen: touchscreen@5d {
> +               compatible = "goodix,gt7375p";
> +               reg = <0x5d>;

One further note is that in the commit message you've said GT7986U in
the commit message but you're specifying "goodix,gt7375p" here.
Ideally, what you'd do is:

1. Create a bindings patch modifying "goodix,gt7375p.yaml" much like
we did for elan [1]. You'd end up with something like this (untested):

  compatible:
    oneOf:
      - const: goodix,gt7375p
      - items:
          - const: goodix,gt7986u
          - const: goodix,gt7375p

2. You wouldn't need any driver patch unless the timings for gt7986u
are different than gt7375p

3. In your device tree, you'd list:

compatible = "goodix,gt7986u", "goodix,gt7375p";

...which says "I really have a gt7986u, but if you don't have any
special knowledge about gt7986u then you can just pretend I have a
gt7375p".

[1] https://lore.kernel.org/r/20220923083657.v5.2.Ic4e8f03868f88b8027a81bc3d414bae68978e6b7@changeid