dt-bindings: interrupt-controller: Convert csky,mpintc to DT schema

Convert the C-SKY Multi-processor interrupt controller binding to schema
format. It's a straight-forward conversion of the typical interrupt
controller.

Link: https://lore.kernel.org/r/20250505144640.1288458-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt

@@ -1,52 +0,0 @@
-===========================================
-C-SKY Multi-processors Interrupt Controller
-===========================================
-
-C-SKY Multi-processors Interrupt Controller is designed for ck807/ck810/ck860
-SMP soc, and it also could be used in non-SMP system.
-
-Interrupt number definition:
-  0-15  : software irq, and we use 15 as our IPI_IRQ.
- 16-31  : private  irq, and we use 16 as the co-processor timer.
- 31-1024: common irq for soc ip.
-
-Interrupt trigger mode: (Defined in dt-bindings/interrupt-controller/irq.h)
- IRQ_TYPE_LEVEL_HIGH (default)
- IRQ_TYPE_LEVEL_LOW
- IRQ_TYPE_EDGE_RISING
- IRQ_TYPE_EDGE_FALLING
-
-=============================
-intc node bindings definition
-=============================
-
-	Description: Describes SMP interrupt controller
-
-	PROPERTIES
-
-	- compatible
-		Usage: required
-		Value type: <string>
-		Definition: must be "csky,mpintc"
-	- #interrupt-cells
-		Usage: required
-		Value type: <u32>
-		Definition: <2>
-	- interrupt-controller:
-		Usage: required
-
-Examples: ("interrupts = <irq_num IRQ_TYPE_XXX>")
----------
-#include <dt-bindings/interrupt-controller/irq.h>
-
-	intc: interrupt-controller {
-		compatible = "csky,mpintc";
-		#interrupt-cells = <2>;
-		interrupt-controller;
-	};
-
-	device: device-example {
-		...
-		interrupts = <34 IRQ_TYPE_EDGE_RISING>;
-		interrupt-parent = <&intc>;
-	};

Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.yaml

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/csky,mpintc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: C-SKY Multi-processors Interrupt Controller
+
+maintainers:
+  - Guo Ren <guoren@kernel.org>
+
+description: >
+  C-SKY Multi-processors Interrupt Controller is designed for ck807/ck810/ck860
+  SMP soc, and it also could be used in non-SMP system.
+
+  Interrupt number definition:
+    0-15  : software irq, and we use 15 as our IPI_IRQ.
+    16-31  : private  irq, and we use 16 as the co-processor timer.
+    31-1024: common irq for soc ip.
+
+properties:
+  compatible:
+    const: csky,mpintc
+
+  '#interrupt-cells':
+    const: 2
+
+  interrupt-controller: true
+
+required:
+  - compatible
+  - "#interrupt-cells"
+  - interrupt-controller
+
+additionalProperties: false
+
+examples:
+  - |
+    interrupt-controller {
+        compatible = "csky,mpintc";
+        #interrupt-cells = <2>;
+        interrupt-controller;
+    };