dt-bindings: input: elan,ekth3000: Convert txt bindings to yaml

Convert Elan touchpad documentation to the YAML syntax.
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: David Heidelberg <david@ixit.cz>
Link: https://lore.kernel.org/r/20211009183016.65218-1-david@ixit.czSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/input/elan,ekth3000.yaml

+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/elan,ekth3000.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Elantech I2C Touchpad
+
+maintainers:
+  - Dmitry Torokhov <dmitry.torokhov@gmail.com>
+
+allOf:
+  - $ref: touchscreen/touchscreen.yaml#
+
+properties:
+  compatible:
+    const: elan,ekth3000
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  wakeup-source:
+    type: boolean
+    description: touchpad can be used as a wakeup source
+
+  vcc-supply:
+    description: a phandle for the regulator supplying 3.3V power
+
+  elan,trackpoint:
+    type: boolean
+    description: touchpad can support a trackpoint
+
+  elan,clickpad:
+    type: boolean
+    description: touchpad is a clickpad (the entire surface is a button)
+
+  elan,middle-button:
+    type: boolean
+    description: touchpad has a physical middle button
+
+  elan,x_traces:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: number of antennas on the x axis
+
+  elan,y_traces:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: number of antennas on the y axis
+
+  touchscreen-size-x: true
+
+  touchscreen-size-y: true
+
+  touchscreen-x-mm: true
+
+  touchscreen-y-mm: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchpad@15 {
+            compatible = "elan,ekth3000";
+            reg = <0x15>;
+            interrupt-parent = <&gpio4>;
+            interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
+            wakeup-source;
+        };
+    };

Documentation/devicetree/bindings/input/elan_i2c.txt

-Elantech I2C Touchpad
-
-Required properties:
-- compatible: must be "elan,ekth3000".
-- reg: I2C address of the chip.
-- interrupts: interrupt to which the chip is connected (see interrupt
-  binding[0]).
-
-Optional properties:
-- wakeup-source: touchpad can be used as a wakeup source.
-- pinctrl-names: should be "default" (see pinctrl binding [1]).
-- pinctrl-0: a phandle pointing to the pin settings for the device (see
-  pinctrl binding [1]).
-- vcc-supply: a phandle for the regulator supplying 3.3V power.
-- elan,trackpoint: touchpad can support a trackpoint (boolean)
-- elan,clickpad: touchpad is a clickpad (the entire surface is a button)
-- elan,middle-button: touchpad has a physical middle button
-- elan,x_traces: number of antennas on the x axis
-- elan,y_traces: number of antennas on the y axis
-- some generic touchscreen properties [2]:
-  * touchscreen-size-x
-  * touchscreen-size-y
-  * touchscreen-x-mm
-  * touchscreen-y-mm
-
-
-[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
-[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
-
-Example:
-	&i2c1 {
-		/* ... */
-
-		touchpad@15 {
-			compatible = "elan,ekth3000";
-			reg = <0x15>;
-			interrupt-parent = <&gpio4>;
-			interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
-			wakeup-source;
-		};
-
-		/* ... */
-	};