dt-bindings: interrupt-controller: Convert Synquacer EXIU to DT schema

Convert the Socionext Synquacer EXIU interrupt controller to DT schema
format.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20221209171636.3351602-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/socionext,synquacer-exiu.txt

-Socionext SynQuacer External Interrupt Unit (EXIU)
-
-The Socionext Synquacer SoC has an external interrupt unit (EXIU)
-that forwards a block of 32 configurable input lines to 32 adjacent
-level-high type GICv3 SPIs.
-
-Required properties:
-
-- compatible           : Should be "socionext,synquacer-exiu".
-- reg                  : Specifies base physical address and size of the
-                         control 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 must be 3.
-- socionext,spi-base   : The SPI number of the first SPI of the 32 adjacent
-                         ones the EXIU forwards its interrups to.
-
-Notes:
-
-- Only SPIs can use the EXIU as an interrupt parent.
-
-Example:
-
-	exiu: interrupt-controller@510c0000 {
-		compatible = "socionext,synquacer-exiu";
-		reg = <0x0 0x510c0000 0x0 0x20>;
-		interrupt-controller;
-		interrupt-parent = <&gic>;
-		#interrupt-cells = <3>;
-		socionext,spi-base = <112>;
-	};

Documentation/devicetree/bindings/interrupt-controller/socionext,synquacer-exiu.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/socionext,synquacer-exiu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Socionext SynQuacer External Interrupt Unit (EXIU)
+
+maintainers:
+  - Ard Biesheuvel <ardb@kernel.org>
+
+description: |+
+  The Socionext SynQuacer SoC has an external interrupt unit (EXIU)
+  that forwards a block of 32 configurable input lines to 32 adjacent
+  level-high type GICv3 SPIs.
+
+properties:
+  compatible:
+    const: socionext,synquacer-exiu
+
+  reg:
+    maxItems: 1
+
+  '#interrupt-cells':
+    const: 3
+
+  interrupt-controller: true
+
+  socionext,spi-base:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: The SPI number of the first SPI of the 32 adjacent ones the
+      EXIU forwards its interrupts to.
+
+required:
+  - compatible
+  - reg
+  - '#interrupt-cells'
+  - interrupt-controller
+  - socionext,spi-base
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    interrupt-controller@510c0000 {
+        compatible = "socionext,synquacer-exiu";
+        reg = <0x510c0000 0x20>;
+        interrupt-controller;
+        interrupt-parent = <&gic>;
+        #interrupt-cells = <3>;
+        socionext,spi-base = <112>;
+    };
+...