dt-bindings: input: Convert MELFAS MIP4 Touchscreen to DT schema

Convert the existing text-based DT bindings for MELFAS MIP4 Touchscreen
controller to a DT schema.

Signed-off-by: Ariel D'Alessandro <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Dmitry Torokhov <[e-mail]>

Documentation/devicetree/bindings/input/touchscreen/melfas,mip4_ts.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/melfas,mip4_ts.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MELFAS MIP4 Touchscreen
+
+maintainers:
+  - Ariel D'Alessandro <[e-mail]>
+
+properties:
+  compatible:
+    const: melfas,mip4_ts
+
+  reg:
+    description: I2C address of the chip (0x48 or 0x34)
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  ce-gpios:
+    description:
+      GPIO connected to the CE (chip enable) pin of the chip (active high)
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen@34 {
+            compatible = "melfas,mip4_ts";
+            reg = <0x34>;
+
+            interrupts-extended = <&tlmm 13 IRQ_TYPE_EDGE_FALLING>;
+            ce-gpios = <&tlmm 12 GPIO_ACTIVE_HIGH>;
+
+            pinctrl-0 = <&touchscreen_default>;
+            pinctrl-names = "default";
+        };
+    };
+
+...

Documentation/devicetree/bindings/input/touchscreen/melfas_mip4.txt

···
-* MELFAS MIP4 Touchscreen
-
-Required properties:
-- compatible: must be "melfas,mip4_ts"
-- reg: I2C slave address of the chip (0x48 or 0x34)
-- interrupts: interrupt to which the chip is connected
-
-Optional properties:
-- ce-gpios: GPIO connected to the CE (chip enable) pin of the chip
-
-Example:
-	i2c@00000000 {
-		touchscreen: melfas_mip4@48 {
-			compatible = "melfas,mip4_ts";
-			reg = <0x48>;
-			interrupt-parent = <&gpio>;
-			interrupts = <0 IRQ_TYPE_EDGE_FALLING>;
-			ce-gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
-		};
-	};