Re: [PATCH 1/2] Documentation: sample averaging for imx6ul_tsc
From: Rob Herring <hidden>
Date: 2016-12-01 16:13:43
Also in:
linux-arm-kernel, linux-devicetree
On Sun, Nov 27, 2016 at 09:44:57AM +0200, Guy Shapiro wrote:
quoted hunk
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 <redacted> --- .../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.
quoted hunk
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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