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dt-bindings: touchscreen: resistive-adc-touch: add support for z1 and z2 channels

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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>
Link: https://lore.kernel.org/r/20210525054634.9134-4-o.rempel@pengutronix.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Oleksij Rempel 2021-05-25 11:55:41 -07:00 committed by Dmitry Torokhov
parent ff7af0fe13
commit 241a952f90
1 changed files with 16 additions and 0 deletions
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16
Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
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@ -27,6 +27,8 @@ properties:
- description: x - description: x
- description: y - description: y
- description: pressure (optional) - description: pressure (optional)
- description: z1 (optional)
- description: z2 (optional)
io-channel-names: io-channel-names:
oneOf: oneOf:
@ -37,6 +39,11 @@ properties:
- enum: [x, y, pressure] - enum: [x, y, pressure]
- enum: [x, y, pressure] - 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-x: true
touchscreen-size-y: true touchscreen-size-y: true
@ -46,6 +53,7 @@ properties:
touchscreen-inverted-y: true touchscreen-inverted-y: true
touchscreen-swapped-x-y: true touchscreen-swapped-x-y: true
touchscreen-min-pressure: true touchscreen-min-pressure: true
touchscreen-x-plate-ohms: true
additionalProperties: false additionalProperties: false
@ -68,3 +76,11 @@ examples:
io-channels = <&adc 24>, <&adc 25>, <&adc 26>; io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
io-channel-names = "y", "pressure", "x"; 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>;
};