dt-bindings: irq: Convert Allwinner IRQ Controller to a schema

The Allwinner SoCs have an interrupt controller supported in Linux, with a
matching Device Tree binding.

Now that we have the DT validation in place, let's convert the device tree
bindings for that controller over to a YAML schemas.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/allwinner,sun4i-a10-ic.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/allwinner,sun4i-a10-ic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner A10 Interrupt Controller Device Tree Bindings
+
+maintainers:
+  - Chen-Yu Tsai <wens@csie.org>
+  - Maxime Ripard <maxime.ripard@bootlin.com>
+
+allOf:
+  - $ref: /schemas/interrupt-controller.yaml#
+
+properties:
+  "#interrupt-cells":
+    const: 1
+
+  compatible:
+    enum:
+      - allwinner,sun4i-a10-ic
+      - allwinner,suniv-f1c100s-ic
+
+  reg:
+    maxItems: 1
+
+  interrupt-controller: true
+
+required:
+  - "#interrupt-cells"
+  - compatible
+  - reg
+  - interrupt-controller
+
+additionalProperties: false
+
+examples:
+  - |
+    intc: interrupt-controller@1c20400 {
+        compatible = "allwinner,sun4i-a10-ic";
+        reg = <0x01c20400 0x400>;
+        interrupt-controller;
+        #interrupt-cells = <1>;
+    };
+
+...

Documentation/devicetree/bindings/interrupt-controller/allwinner,sun4i-ic.txt

-Allwinner Sunxi Interrupt Controller
-
-Required properties:
-
-- compatible : should be one of the following:
-              "allwinner,sun4i-a10-ic"
-              "allwinner,suniv-f1c100s-ic"
-- reg : Specifies base physical address and size of the registers.
-- interrupt-controller : Identifies the node as an interrupt controller
-- #interrupt-cells : Specifies the number of cells needed to encode an
-  interrupt source. The value shall be 1.
-
-Example:
-
-intc: interrupt-controller {
-	compatible = "allwinner,sun4i-a10-ic";
-	reg = <0x01c20400 0x400>;
-	interrupt-controller;
-	#interrupt-cells = <1>;
-};