[PATCH v5 7/8] dt-bindings: touchscreen: resistive-adc-touch: add support for z1 and z2 channels
From: Oleksij Rempel <o.rempel@pengutronix.de>
Date: 2021-05-21 04:46:17
Also in:
linux-devicetree, 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
For pressure calculation based on plates resistance we need some additional properties: - z1 and z2 channels with additional measurements between plates - actual resistance of the touchscreen. Currently we use only X-resistance. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Rob Herring <robh@kernel.org> --- .../input/touchscreen/resistive-adc-touch.yaml | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
index 38b4cbee9429..7fc22a403d48 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml@@ -27,6 +27,8 @@ properties: - description: x - description: y - description: pressure (optional) + - description: z1 (optional) + - description: z2 (optional) io-channel-names: oneOf:
@@ -37,6 +39,11 @@ properties: - enum: [x, y, pressure] - enum: [x, y, pressure] - enum: [x, y, pressure] + - items: + - enum: [x, y, z1, z2] + - enum: [x, y, z1, z2] + - enum: [x, y, z1, z2] + - enum: [x, y, z1, z2] touchscreen-size-x: true touchscreen-size-y: true
@@ -46,6 +53,7 @@ properties: touchscreen-inverted-y: true touchscreen-swapped-x-y: true touchscreen-min-pressure: true + touchscreen-x-plate-ohms: true additionalProperties: false
@@ -68,3 +76,11 @@ examples: io-channels = <&adc 24>, <&adc 25>, <&adc 26>; io-channel-names = "y", "pressure", "x"; }; + - | + touchscreen { + compatible = "resistive-adc-touch"; + touchscreen-min-pressure = <50000>; + io-channels = <&adc 1>, <&adc 2>, <&adc 3>, <&adc 4>; + io-channel-names = "x", "z1", "z2", "y"; + touchscreen-x-plate-ohms = <800>; + };
--
2.29.2