linux-kernel - Re: [PATCH v2 1/2] dt-bindings: input: touchscreen: Add ilitek 9882T touchscreen chip

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Message-ID: <CAHwB_NKJa6PPHkUotG2-yyZMvLbdSOiC+QrTGRDX5TL=Lsqibg@mail.gmail.com>
Date:   Wed, 7 Jun 2023 16:55:06 +0800
From:   cong yang <yangcong5@...qin.corp-partner.google.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, jikos@...nel.org,
        benjamin.tissoires@...hat.com, dianders@...omium.org,
        hsinyi@...gle.com, linux-input@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: input: touchscreen: Add ilitek 9882T
 touchscreen chip

Hi,Dmitry

On Wed, Jun 7, 2023 at 2:51 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> On Mon, Jun 05, 2023 at 12:34:54PM +0200, Krzysztof Kozlowski wrote:
> > On 05/06/2023 08:05, Cong Yang wrote:
> > > Add an ilitek touch screen chip ili9882t.
> > >
> > > Signed-off-by: Cong Yang <yangcong5@...qin.corp-partner.google.com>
> > > ---
> > >  .../bindings/input/elan,ekth6915.yaml         | 23 ++++++++++++++++---
> > >  1 file changed, 20 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
> > > index 05e6f2df604c..f0e7ffdce605 100644
> > > --- a/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
> > > +++ b/Documentation/devicetree/bindings/input/elan,ekth6915.yaml
> > > @@ -15,11 +15,14 @@ description:
> > >
> > >  properties:
> > >    compatible:
> > > -    items:
> > > -      - const: elan,ekth6915
> > > +    enum:
> > > +      - elan,ekth6915
> > > +      - ilitek,ili9882t
> > >
> > >    reg:
> > > -    const: 0x10
> > > +    enum:
> > > +      - 0x10
> > > +      - 0x41
> > >
> > >    interrupts:
> > >      maxItems: 1
> > > @@ -29,11 +32,13 @@ properties:
> > >
> > >    vcc33-supply:
> > >      description: The 3.3V supply to the touchscreen.
> > > +                 If using ili9882t then this supply will not be needed.
> >
> > What does it mean "will not be needed"? Describe the hardware, not your
> > drivers.
>
> I do not think it makes sense to merge Ilitek and Elan into a single
> binding. The only thing that they have in common is that we are trying
> to reuse drivers/hid/i2c-hid/i2c-hid-of-elan.c to handle reset timings
> (which is also questionable IMO).
>
> Maybe if we had a single unified binding for HID-over-I2C touchscreens
> then combining would make more sense, at least to me...
>

Okay, thanks for the suggestion, I will add an ilitek binding.

> Thanks.
>
> --
> Dmitry