[PATCH v7 4/9] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings
From: Eugen Hristev <hidden>
Date: 2018-05-22 08:00:26
Also in:
linux-arm-kernel, linux-devicetree, linux-iio, lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Dmitry Torokhov, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Added bindings for generic resistive touchscreen ADC. Signed-off-by: Eugen Hristev <redacted> Reviewed-by: Rob Herring <robh@kernel.org> --- Changes in v5: - changed property name touchscreen-threshold-pressure to touchscreen-min-pressure Changes in v3: - renamed file and compatible to exclude "generic" keyword - removed the pressure threshold property, added it as a common touchscreen property in the touchscreen common bindings in a separate commit. Changes in v2: - modified bindings to have a generic resistive touchscreen adc driver instead of specific architecture one. .../input/touchscreen/resistive-adc-touch.txt | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
new file mode 100644
index 0000000..51456c0
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt@@ -0,0 +1,30 @@ +Generic resistive touchscreen ADC + +Required properties: + + - compatible: must be "resistive-adc-touch" +The device must be connected to an ADC device that provides channels for +position measurement and optional pressure. +Refer to ../iio/iio-bindings.txt for details + - iio-channels: must have at least two channels connected to an ADC device. +These should correspond to the channels exposed by the ADC device and should +have the right index as the ADC device registers them. These channels +represent the relative position on the "x" and "y" axes. + - iio-channel-names: must have all the channels' names. Mandatory channels +are "x" and "y". + +Optional properties: + - iio-channels: The third channel named "pressure" is optional and can be +used if the ADC device also measures pressure besides position. +If this channel is missing, pressure will be ignored and the touchscreen +will only report position. + - iio-channel-names: optional channel named "pressure". + +Example: + + resistive_touch: resistive_touch { + compatible = "resistive-adc-touch"; + touchscreen-min-pressure = <50000>; + io-channels = <&adc 24>, <&adc 25>, <&adc 26>; + io-channel-names = "x", "y", "pressure"; + };
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2.7.4