dt-bindings: interrupt-controller: via,vt8500-intc: Convert to YAML

Rewrite the textual description for the VIA/WonderMedia interrupt
controller as YAML schema.

The original textual version did not contain information about the
usage of 'interrupts' to describe the connection of a chained
controller to its parent, add it here. A chained controller can
trigger up to 8 different interrupts (IRQ0~7) on its parent.

Signed-off-by: Alexey Charkov <alchark@gmail.com>
Link: https://lore.kernel.org/r/20250418-via_intc_binding-v2-1-b649ce737f71@gmail.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/via,vt8500-intc.txt

@@ -1,16 +0,0 @@
-VIA/Wondermedia VT8500 Interrupt Controller
------------------------------------------------------
-
-Required properties:
-- compatible : "via,vt8500-intc"
-- reg : Should contain 1 register ranges(address and length)
-- #interrupt-cells : should be <1>
-
-Example:
-
-	intc: interrupt-controller@d8140000 {
-		compatible = "via,vt8500-intc";
-		interrupt-controller;
-		reg = <0xd8140000 0x10000>;
-		#interrupt-cells = <1>;
-	};

Documentation/devicetree/bindings/interrupt-controller/via,vt8500-intc.yaml

@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/via,vt8500-intc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: VIA and WonderMedia SoCs Interrupt Controller
+
+description:
+  This is the interrupt controller used in single-core ARM SoCs made by
+  VIA and WonderMedia (up to and including WM8950). Each block handles
+  up to 64 interrupt sources (level or edge triggered) and can generate
+  up to 8 interrupts to its parent when used in a chained configuration.
+
+maintainers:
+  - Alexey Charkov <alchark@gmail.com>
+
+allOf:
+  - $ref: /schemas/interrupt-controller.yaml#
+
+properties:
+  compatible:
+    const: via,vt8500-intc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description:
+          Interrupt number raised by the IRQ0 output of this controller
+          Only used if this controller is chained
+      - description:
+          Interrupt number raised by the IRQ1 output of this controller
+          Only used if this controller is chained
+      - description:
+          Interrupt number raised by the IRQ2 output of this controller
+          Only used if this controller is chained
+      - description:
+          Interrupt number raised by the IRQ3 output of this controller
+          Only used if this controller is chained
+      - description:
+          Interrupt number raised by the IRQ4 output of this controller
+          Only used if this controller is chained
+      - description:
+          Interrupt number raised by the IRQ5 output of this controller
+          Only used if this controller is chained
+      - description:
+          Interrupt number raised by the IRQ6 output of this controller
+          Only used if this controller is chained
+      - description:
+          Interrupt number raised by the IRQ7 output of this controller
+          Only used if this controller is chained
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - interrupt-controller
+  - '#interrupt-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller@d8140000 {
+        compatible = "via,vt8500-intc";
+        interrupt-controller;
+        reg = <0xd8140000 0x10000>;
+        #interrupt-cells = <1>;
+    };
+...

MAINTAINERS

@@ -3428,6 +3428,7 @@ M:	Krzysztof Kozlowski <krzk@kernel.org>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Odd Fixes
 F:	Documentation/devicetree/bindings/i2c/i2c-wmt.txt
+F:	Documentation/devicetree/bindings/interrupt-controller/via,vt8500-intc.yaml
 F:	arch/arm/boot/dts/vt8500/
 F:	arch/arm/mach-vt8500/
 F:	drivers/clocksource/timer-vt8500.c