dt-bindings: input: Convert Silead GSL1680 binding to a schema

The Silead GSL1680 Touchscreen Controller is supported by Linux thanks
to its device tree binding.

Now that we have the DT validation in place, let's convert the device
tree bindings for that driver over to a YAML schema.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20211015073006.8939-1-maxime@cerno.techSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/input/touchscreen/silead,gsl1680.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/silead,gsl1680.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Silead GSL1680 Touchscreen Controller Device Tree Bindings
+
+maintainers:
+  - Dmitry Torokhov <dmitry.torokhov@gmail.com>
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  compatible:
+    enum:
+      - silead,gsl1680
+      - silead,gsl1688
+      - silead,gsl3670
+      - silead,gsl3675
+      - silead,gsl3692
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  power-gpios:
+    maxItems: 1
+
+  firmware-name:
+    $ref: /schemas/types.yaml#/definitions/string
+    description: >
+      File basename for board specific firmware
+
+  silead,max-fingers:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    maximum: 5
+    description: >
+      Maximum number of fingers the touchscreen can detect
+
+  silead,home-button:
+    type: boolean
+    description: >
+      Does the device have a capacitive home-button build into the
+      touchscreen?
+
+  avdd-supply:
+    description: >
+      Regulator phandle for controller AVDD
+
+  vddio-supply:
+    description: >
+      Regulator phandle for controller VDDIO
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - power-gpios
+  - touchscreen-size-x
+  - touchscreen-size-y
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen@40 {
+            compatible = "silead,gsl1680";
+            reg = <0x40>;
+            interrupt-parent = <&pio>;
+            interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>;
+            power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
+            touchscreen-size-x = <480>;
+            touchscreen-size-y = <800>;
+            touchscreen-inverted-x;
+            touchscreen-swapped-x-y;
+            silead,max-fingers = <5>;
+        };
+    };
+
+...

Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt

-* GSL 1680 touchscreen controller
-
-Required properties:
-- compatible		  : Must be one of the following, depending on the model:
-			    "silead,gsl1680"
-			    "silead,gsl1688"
-			    "silead,gsl3670"
-			    "silead,gsl3675"
-			    "silead,gsl3692"
-- reg			  : I2C slave address of the chip (0x40)
-- interrupts		  : interrupt specification for the gsl1680 interrupt
-- power-gpios		  : Specification for the pin connected to the gsl1680's
-			    shutdown input. This needs to be driven high to take the
-			    gsl1680 out of its low power state
-- touchscreen-size-x	  : See touchscreen.txt
-- touchscreen-size-y	  : See touchscreen.txt
-
-Optional properties:
-- firmware-name		  : File basename (string) for board specific firmware
-- touchscreen-inverted-x  : See touchscreen.txt
-- touchscreen-inverted-y  : See touchscreen.txt
-- touchscreen-swapped-x-y : See touchscreen.txt
-- silead,max-fingers	  : maximum number of fingers the touchscreen can detect
-- silead,home-button	  : Boolean, set to true on devices which have a
-			    capacitive home-button build into the touchscreen
-- vddio-supply		  : regulator phandle for controller VDDIO
-- avdd-supply		  : regulator phandle for controller AVDD
-
-Example:
-
-i2c@00000000 {
-	gsl1680: touchscreen@40 {
-		compatible = "silead,gsl1680";
-		reg = <0x40>;
-		interrupt-parent = <&pio>;
-		interrupts = <6 11 IRQ_TYPE_EDGE_FALLING>;
-		power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>;
-		touchscreen-size-x = <480>;
-		touchscreen-size-y = <800>;
-		touchscreen-inverted-x;
-		touchscreen-swapped-x-y;
-		silead,max-fingers = <5>;
-	};
-};