summaryrefslogtreecommitdiffstats
path: root/dts/Bindings/input/touchscreen/ti-tsc-adc.txt
diff options
context:
space:
mode:
authorSascha Hauer <s.hauer@pengutronix.de>2015-03-03 08:11:01 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2015-03-03 08:11:01 +0100
commiteaa819409db6ac80fbd7c3d36450b2d1bec93576 (patch)
tree6cd5e0c7f8abe121af237b701ee9e0e1b6f7e40d /dts/Bindings/input/touchscreen/ti-tsc-adc.txt
parent0c9aadb6185e1d84746b632284bc89e4e4c80cd3 (diff)
downloadbarebox-eaa819409db6ac80fbd7c3d36450b2d1bec93576.tar.gz
barebox-eaa819409db6ac80fbd7c3d36450b2d1bec93576.tar.xz
dts: update to v4.0-rc1
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'dts/Bindings/input/touchscreen/ti-tsc-adc.txt')
-rw-r--r--dts/Bindings/input/touchscreen/ti-tsc-adc.txt15
1 files changed, 15 insertions, 0 deletions
diff --git a/dts/Bindings/input/touchscreen/ti-tsc-adc.txt b/dts/Bindings/input/touchscreen/ti-tsc-adc.txt
index 878549ba81..6c4fb34823 100644
--- a/dts/Bindings/input/touchscreen/ti-tsc-adc.txt
+++ b/dts/Bindings/input/touchscreen/ti-tsc-adc.txt
@@ -28,6 +28,20 @@ Required properties:
ti,adc-channels: List of analog inputs available for ADC.
AIN0 = 0, AIN1 = 1 and so on till AIN7 = 7.
+Optional properties:
+- child "tsc"
+ ti,charge-delay: Length of touch screen charge delay step in terms of
+ ADC clock cycles. Charge delay value should be large
+ in order to avoid false pen-up events. This value
+ effects the overall sampling speed, hence need to be
+ kept as low as possible, while avoiding false pen-up
+ event. Start from a lower value, say 0x400, and
+ increase value until false pen-up events are avoided.
+ The pen-up detection happens immediately after the
+ charge step, so this does in fact function as a
+ hardware knob for adjusting the amount of "settling
+ time".
+
Example:
tscadc: tscadc@44e0d000 {
compatible = "ti,am3359-tscadc";
@@ -36,6 +50,7 @@ Example:
ti,x-plate-resistance = <200>;
ti,coordiante-readouts = <5>;
ti,wire-config = <0x00 0x11 0x22 0x33>;
+ ti,charge-delay = <0x400>;
};
adc {