| Message ID | 1522153963-1121-4-git-send-email-eugen.hristev@microchip.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, Mar 27, 2018 at 03:32:36PM +0300, Eugen Hristev wrote: > Added bindings for generic resistive touchscreen ADC. > > Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com> > --- > Changes in v2: > - modified bindings to have a generic resistive touchscreen adc driver > instead of specific architecture one. > > .../bindings/input/touchscreen/touch_adc.txt | 33 ++++++++++++++++++++++ > 1 file changed, 33 insertions(+) > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt b/Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt > new file mode 100644 > index 0000000..27abcdc > --- /dev/null > +++ b/Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt > @@ -0,0 +1,33 @@ > +Generic resistive touchscreen ADC > + > +Required properties: > + > + - compatible: must be "generic-resistive-adc-touch" Drop "generic-" and rename the file after the compatible string. > +The device must be connected to an IIO device that provides channels for s/IIO/ADC/ > +position measurement and optional pressure. > +Refer to ../iio/iio-bindings.txt for details > + - iio-channels: must have at least two channels connected to an IIO device. > +These should correspond to the channels exposed by the IIO device and should > +have the right index as the IIO 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 IIO 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". > + - generic-resistive-adc-touch,pressure-threshold: a pressure threshold for > +the touchscreen, if we are using the "pressure" channel as well. > +Represented by an integer value. Define a common touchscreen property for this. We already have several definitions. It seems to me that "contact-threshold" would have been the same thing, but it is deprecated in favor of "touchscreen-fuzz-pressure" which doesn't really sound like the same thing. Rob
diff --git a/Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt b/Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt new file mode 100644 index 0000000..27abcdc --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt @@ -0,0 +1,33 @@ +Generic resistive touchscreen ADC + +Required properties: + + - compatible: must be "generic-resistive-adc-touch" +The device must be connected to an IIO 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 IIO device. +These should correspond to the channels exposed by the IIO device and should +have the right index as the IIO 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 IIO 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". + - generic-resistive-adc-touch,pressure-threshold: a pressure threshold for +the touchscreen, if we are using the "pressure" channel as well. +Represented by an integer value. + +Example: + + resistive_touch: resistive_touch { + compatible = "generic-resistive-adc-touch"; + generic-resistive-adc-touch,pressure-threshold = <10000>; + io-channels = <&adc 24>, <&adc 25>, <&adc 26>; + io-channel-names = "x", "y", "pressure"; + };
Added bindings for generic resistive touchscreen ADC. Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com> --- Changes in v2: - modified bindings to have a generic resistive touchscreen adc driver instead of specific architecture one. .../bindings/input/touchscreen/touch_adc.txt | 33 ++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/touch_adc.txt