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authorGuy Shapiro <guy.shapiro@mobi-wize.com>2016-11-27 20:40:39 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2016-11-27 20:45:14 -0800
commit031bfed2aba8a727fe5a6c2169d5e4e0751a1bf0 (patch)
tree79a362173ee0e737015938b4fedd8724b080cf56 /Documentation
parentae3b4469dbcd3b842a9fd20940946e4d092d8731 (diff)
Input: imx6ul_tsc - add support for sample averaging
The i.MX6UL internal touchscreen controller contains an option to average upon samples. This feature reduces noise from the produced touch locations. This patch adds sample averaging support to the imx6ul_tsc device driver. Signed-off-by: Guy Shapiro <guy.shapiro@mobi-wize.com> Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt b/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt
index 853dff96dd9f..a66069f6db66 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
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";
};