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

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Message-ID: <20230605-anyway-grab-f7a35aa199fb@spud>
Date:   Mon, 5 Jun 2023 11:20:20 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Cong Yang <yangcong5@...qin.corp-partner.google.com>
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

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?
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.

>  
>    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.

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

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