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

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Date:   Tue, 6 Jun 2023 10:06:05 +0800
From:   cong yang <yangcong5@...qin.corp-partner.google.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, dmitry.torokhov@...il.com, 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,Conor,

On Mon, Jun 5, 2023 at 6:20 PM Conor Dooley <conor@...nel.org> wrote:
>
> Hey Cong Yang,
>
> On Mon, Jun 05, 2023 at 02:05:23PM +0800, Cong Yang wrote:
> > Add an ilitek touch screen chip ili9882t.
>
> Could you add a comment here mentioning the relationship between these
> chips?

Okay, I will add in V3 version.

> On Mon, Jun 05, 2023 at 02:05:23PM +0800, Cong Yang wrote:
>
> > 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
>
> Is 0x10 only valid for the elan,ekth6915 & 0x41 for the ilitek one?
> If so, please add some enforcement of the values based on the
> compatible.

I don't think 0x10 is the only address for ekth6915,(nor is 0x41 the
only address for ili9882t). It depends on the hardware design.

>
> >
> >    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.
> >
> >    vccio-supply:
> >      description:
> >        The IO supply to the touchscreen. Need not be specified if this is the
> >        same as the 3.3V supply.
> > +      If using ili9882t, the IO supply is required.
>
> There's no need for these sort of comments, you can rely on the required
> sections to describe these relationships.

Got it ,thanks.


>
> Cheers,
> Conor.
>
> >
> >  required:
> >    - compatible
> > @@ -41,6 +46,18 @@ required:
> >    - interrupts
> >    - vcc33-supply
> >
> > +if:
> > +  properties:
> > +    compatible:
> > +      contains:
> > +        const: ilitek,ili9882t
> > +then:
> > +  required:
> > +    - compatible
> > +    - reg
> > +    - interrupts
> > +    - vccio-supply
> > +
> >  additionalProperties: false
> >
> >  examples:
> > --
> > 2.25.1