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
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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