diff mbox

[v2,03/10] dt-bindings: input: touchscreen: touch_adc: create bindings

Message ID 1522153963-1121-4-git-send-email-eugen.hristev@microchip.com (mailing list archive)
State New, archived
Headers show

Commit Message

Eugen Hristev March 27, 2018, 12:32 p.m. UTC
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

Comments

Rob Herring (Arm) April 9, 2018, 6:46 p.m. UTC | #1
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
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diff mbox

Patch

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";
+	};