dt-bindings: touchscreen: Convert resistive-adc-touch binding to json schema

Convert the resistive-adc-touch binding to DT schema format using json-schema.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20210525054634.9134-2-o.rempel@pengutronix.deSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt

-Generic resistive touchscreen ADC
-
-Required properties:
-
- - compatible: must be "resistive-adc-touch"
-The device must be connected to an ADC device that provides channels for
-position measurement and optional pressure.
-Refer to
-https://github.com/devicetree-org/dt-schema/blob/master/schemas/iio/iio-consumer.yaml
-for details
-
- - iio-channels: must have at least two channels connected to an ADC device.
-These should correspond to the channels exposed by the ADC device and should
-have the right index as the ADC 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 ADC 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".
-
-Example:
-
-	resistive_touch: resistive_touch {
-		compatible = "resistive-adc-touch";
-		touchscreen-min-pressure = <50000>;
-		io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
-		io-channel-names = "x", "y", "pressure";
-	};

Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/resistive-adc-touch.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Generic resistive touchscreen ADC
+
+maintainers:
+  - Oleksij Rempel <o.rempel@pengutronix.de>
+
+description: |
+  Generic ADC based resistive touchscreen controller
+  The device must be connected to an ADC device that provides channels for
+  position measurement and optional pressure.
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  compatible:
+    const: resistive-adc-touch
+
+  io-channels:
+    minItems: 2
+    items:
+      - description: x
+      - description: y
+      - description: pressure (optional)
+
+  io-channel-names:
+    oneOf:
+      - items:
+          - enum: [x, y]
+          - enum: [x, y]
+      - items:
+          - enum: [x, y, pressure]
+          - enum: [x, y, pressure]
+          - enum: [x, y, pressure]
+
+  touchscreen-size-x: true
+  touchscreen-size-y: true
+  touchscreen-fuzz-x: true
+  touchscreen-fuzz-y: true
+  touchscreen-inverted-x: true
+  touchscreen-inverted-y: true
+  touchscreen-swapped-x-y: true
+  touchscreen-min-pressure: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - io-channels
+  - io-channel-names
+
+examples:
+  - |
+    touchscreen {
+      compatible = "resistive-adc-touch";
+      io-channels = <&adc 24>, <&adc 25>;
+      io-channel-names = "y", "x";
+    };
+  - |
+    touchscreen {
+      compatible = "resistive-adc-touch";
+      touchscreen-min-pressure = <50000>;
+      io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
+      io-channel-names = "y", "pressure", "x";
+    };