On Sun, Nov 27, 2016 at 09:44:57AM +0200, Guy Shapiro wrote:
> The i.MX6UL internal touchscreen controller contains an option to
> average upon samples. This feature reduces noise from the produced
> touch locations.
>
> This patch introduces a new device tree optional property for this
> feature. It provides control over the amount of averaged samples per
> touch event.
>
> The property was inspired by a similar property on the
> "brcm,iproc-touchscreen" binding.
>
> Signed-off-by: Guy Shapiro <guy.shapiro@xxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/input/touchscreen/imx6ul_tsc.txt | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt b/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt
> index 853dff9..a66069f 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt
> @@ -17,6 +17,13 @@ Optional properties:
> This value depends on the touch screen.
> - pre-charge-time: the touch screen need some time to precharge.
> This value depends on the touch screen.
> +- average-samples: Number of data samples which are averaged for each read.
> + Valid values 0-4
> + 0 = 1 sample
> + 1 = 4 samples
> + 2 = 8 samples
> + 3 = 16 samples
> + 4 = 32 samples
Either this needs a vendor prefix or should be documented as a generic
property. In the latter case, you should use actual number of samples
(1-32) for the values.
>
> Example:
> tsc: tsc@02040000 {
> @@ -32,5 +39,6 @@ Example:
> xnur-gpio = <&gpio1 3 GPIO_ACTIVE_LOW>;
> measure-delay-time = <0xfff>;
> pre-charge-time = <0xffff>;
> + average-samples = <4>;
> status = "okay";
> };
> --
> 2.1.4
>
>
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