Re: [PATCH 2/4] dt-bindings: input: touchscreen: fsl,imx6ul-tsc: add fsl,glitch-threshold

[Rob Herring <robh@kernel.org>]

On Tue, Jul 22, 2025 at 12:36:16PM +0200, Dario Binacchi wrote:
> Add support for glitch threshold configuration. A detected signal is valid
> only if it lasts longer than the set threshold; otherwise, it is regarded
> as a glitch.
> 
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> ---
> 
>  .../input/touchscreen/fsl,imx6ul-tsc.yaml      | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/fsl,imx6ul-tsc.yaml b/Documentation/devicetree/bindings/input/touchscreen/fsl,imx6ul-tsc.yaml
> index 678756ad0f92..2fee2940213f 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/fsl,imx6ul-tsc.yaml
> +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl,imx6ul-tsc.yaml
> @@ -62,6 +62,23 @@ properties:
>      description: Number of data samples which are averaged for each read.
>      enum: [ 1, 4, 8, 16, 32 ]
>  
> +  fsl,glitch-threshold:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0
> +    enum: [ 0, 1, 2, 3 ]
> +    description: |
> +      Indicates the glitch threshold. The threshold is defined by number
> +      of clock cycles. A detect signal is only valid if it is exist longer
> +      than threshold; otherwise, it is regarded as a glitch.
> +      0: Normal function: 8191 clock cycles
> +         Low power mode: 9 clock cycles
> +      1: Normal function: 4095 clock cycles
> +         Low power mode: 7 clock cycles
> +      2: Normal function: 2047 clock cycles
> +         Low power mode: 5 clock cycles
> +      3: Normal function: 1023 clock cycles
> +         Low power mode: 3 clock cycles

Don't we have common properties for this expressed in time? Debounce 
time IIRC.

> +
>  required:
>    - compatible
>    - reg
> @@ -94,4 +111,5 @@ examples:
>          measure-delay-time = <0xfff>;
>          pre-charge-time = <0xffff>;
>          touchscreen-average-samples = <32>;
> +        fsl,glitch-threshold = <2>;
>      };
> -- 
> 2.43.0
>