Thread (21 messages) 21 messages, 6 authors, 2018-04-10
STALE2972d
Revisions (6)
  1. v2 current
  2. v3 [diff vs current]
  3. v4 [diff vs current]
  4. v5 [diff vs current]
  5. v6 [diff vs current]
  6. v7 [diff vs current]

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

From: Eugen Hristev <hidden>
Date: 2018-03-27 12:34:53
Also in: linux-devicetree, linux-iio, linux-input, 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>
---
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"
+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";
+	};
-- 
2.7.4
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