linux-kernel - Re: [PATCH v3 4/6] dt-bindings: touchscreen: fsl,imx6ul-tsc: support glitch thresold

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Message-ID: <aMmIZTMqr0rtiP6z@lizhi-Precision-Tower-5810>
Date: Tue, 16 Sep 2025 11:55:17 -0400
From: Frank Li <Frank.li@....com>
To: Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc: linux-kernel@...r.kernel.org, linux-amarula@...rulasolutions.com,
	Conor Dooley <conor+dt@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Fabio Estevam <festevam@...il.com>, Haibo Chen <haibo.chen@....com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Rob Herring <robh@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-input@...r.kernel.org
Subject: Re: [PATCH v3 4/6] dt-bindings: touchscreen: fsl,imx6ul-tsc: support
 glitch thresold

On Mon, Sep 15, 2025 at 09:53:06PM +0200, Dario Binacchi wrote:
> Support the touchscreen-glitch-threshold-ns property. Unlike the
> generic description in touchscreen.yaml, this controller maps the
> provided value to one of four discrete thresholds internally.
>
> Signed-off-by: Dario Binacchi <dario.binacchi@...rulasolutions.com>
>
> ---
>
> Changes in v3:
> - Remove the final part of the description that refers to
>   implementation details.
>
>  .../bindings/input/touchscreen/fsl,imx6ul-tsc.yaml   | 12 ++++++++++++
>  1 file changed, 12 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..6214d8be5a99 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/fsl,imx6ul-tsc.yaml
> +++ b/Documentation/devicetree/bindings/input/touchscreen/fsl,imx6ul-tsc.yaml
> @@ -62,6 +62,18 @@ properties:
>      description: Number of data samples which are averaged for each read.
>      enum: [ 1, 4, 8, 16, 32 ]
>
> +  touchscreen-glitch-threshold-ns:
> +    description: |
> +      Unlike the generic property defined in touchscreen.yaml, this
> +      controller does not allow arbitrary values. Internally the value is
> +      converted to IPG clock cycles and mapped to one of four discrete
> +      thresholds exposed by the TSC_DEBUG_MODE2 register:
> +
> +        0: 8191 IPG cycles
> +        1: 4095 IPG cycles
> +        2: 2047 IPG cycles
> +        3: 1023 IPG cycles
> +

You have to use ns here. You can caculate in driver to match to closed one.

Frank

>  required:
>    - compatible
>    - reg
> --
> 2.43.0
>