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| author | Josh Wu <josh.wu@atmel.com> | 2013-10-08 04:48:00 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2013-10-17 23:57:10 +0100 |
| commit | c8b11de0404d318c4a67bf6b9066663b9d93786c (patch) | |
| tree | 9b16572470ea64b946b12ce7fa2ada6cf095fab3 /Documentation | |
| parent | 094509b1d1cac8b39097dfef36ed1bba70c53d96 (diff) | |
| download | linux-c8b11de0404d318c4a67bf6b9066663b9d93786c.tar.bz2 | |
iio: at91: introduce touch screen support in iio adc driver
AT91 ADC hardware integrate touch screen support. So this patch add touch
screen support for at91 adc iio driver.
To enable touch screen support in adc, you need to add the dt parameters:
1. which type of touch are used? (4 or 5 wires), sample period time.
2. correct pressure detect threshold value.
In the meantime, since touch screen will use a interal period trigger of adc,
so it is conflict to other hardware triggers. Driver will disable the hardware
trigger support if touch screen is enabled.
This driver has been tested in AT91SAM9X5-EK and SAMA5D3x-EK.
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: devicetree@vger.kernel.org
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/arm/atmel-adc.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/atmel-adc.txt b/Documentation/devicetree/bindings/arm/atmel-adc.txt index 0e65e0137487..d1061469f63d 100644 --- a/Documentation/devicetree/bindings/arm/atmel-adc.txt +++ b/Documentation/devicetree/bindings/arm/atmel-adc.txt @@ -23,6 +23,13 @@ Optional properties: resolution will be used. - atmel,adc-sleep-mode: Boolean to enable sleep mode when no conversion - atmel,adc-sample-hold-time: Sample and Hold Time in microseconds + - atmel,adc-ts-wires: Number of touch screen wires. Should be 4 or 5. If this + value is set, then adc driver will enable touch screen + support. + NOTE: when adc touch screen enabled, the adc hardware trigger will be + disabled. Since touch screen will occupied the trigger register. + - atmel,adc-ts-pressure-threshold: a pressure threshold for touchscreen. It + make touch detect more precision. Optional trigger Nodes: - Required properties: |