dt-bindings: touchscreen: convert elan,ektf2127 to json-schema

Convert EKTF2127 infrared touchscreen controller binding to DT schema
and add ektf2232 compatible.
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240621224022.1620897-2-andreas@kemnade.infoSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt

-* Elan eKTF2127 I2C touchscreen controller
-
-Required properties:
- - compatible		  : "elan,ektf2127" or "elan,ektf2132"
- - reg			  : I2C slave address of the chip (0x40)
- - interrupts		  : interrupt specification for the ektf2127 interrupt
- - power-gpios		  : GPIO specification for the pin connected to the
-			    ektf2127's wake input. This needs to be driven high
-			    to take ektf2127 out of its low power state
-
-For additional optional properties see: touchscreen.txt
-
-Example:
-
-i2c@00000000 {
-	ektf2127: touchscreen@15 {
-		compatible = "elan,ektf2127";
-		reg = <0x15>;
-		interrupt-parent = <&pio>;
-		interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>
-		power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
-		touchscreen-inverted-x;
-		touchscreen-swapped-x-y;
-	};
-};

Documentation/devicetree/bindings/input/touchscreen/elan,ektf2127.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/elan,ektf2127.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Elan eKTF2127 I2C touchscreen controller
+
+maintainers:
+  - Siebren Vroegindeweij <siebren.vroegindeweij@hotmail.com>
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  compatible:
+    enum:
+      - elan,ektf2127
+      - elan,ektf2132
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  power-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - power-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen@15 {
+            compatible = "elan,ektf2127";
+            reg = <0x15>;
+            interrupt-parent = <&pio>;
+            interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>;
+            power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
+            touchscreen-inverted-x;
+            touchscreen-swapped-x-y;
+        };
+    };
+...