linux-kernel - Re: [PATCH v2] dt-bindings: input: touchscreen: goodix: clarify irq-gpios misleading text

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Date:   Tue, 26 Sep 2023 20:56:17 -0500
From:   Jeff LaBundy <jeff@...undy.com>
To:     Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc:     devicetree@...r.kernel.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2] dt-bindings: input: touchscreen: goodix: clarify
 irq-gpios misleading text

Hi Luca,

On Mon, Sep 25, 2023 at 05:22:08AM +0200, Luca Ceresoli wrote:
> The irq-gpios description misleading, apparently saying that driving the
> IRQ GPIO resets the device, which is even more puzzling as there is a reset
> GPIO as well.
> 
> In reality the IRQ pin can be driven during the reset sequence to configure
> the client address, as it becomes clear after checking both the datasheet
> and the driver code. Improve the text to clarify that.
> 
> Also rephrase to remove reference to the driver, which is not appropriate
> in the bindings.
> 
> Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

Reviewed-by: Jeff LaBundy <jeff@...undy.com>

> 
> ---
> 
> Changed in v2:
>  - reworded to clarify even further
> ---
>  .../devicetree/bindings/input/touchscreen/goodix.yaml        | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/goodix.yaml b/Documentation/devicetree/bindings/input/touchscreen/goodix.yaml
> index 3d016b87c8df..2a2d86cfd104 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/goodix.yaml
> +++ b/Documentation/devicetree/bindings/input/touchscreen/goodix.yaml
> @@ -37,8 +37,9 @@ properties:
>      maxItems: 1
>  
>    irq-gpios:
> -    description: GPIO pin used for IRQ. The driver uses the interrupt gpio pin
> -      as output to reset the device.
> +    description: GPIO pin used for IRQ input. Additionally, this line is
> +      sampled by the device on reset deassertion to select the I2C client
> +      address, thus it can be driven by the host during the reset sequence.
>      maxItems: 1
>  
>    reset-gpios:
> -- 
> 2.34.1
> 

Thanks for considering my feedback; the messaging is clear now.

Kind regards,
Jeff LaBundy