dt-bindings: interrupt-controller: Convert Atmel AIC to json-schema

Convert the Atmel AIC binding document to DT schema format using
json-schema.

Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240222090738.41628-1-dharma.b@microchip.com
Signed-off-by: Rob Herring <robh@kernel.org>

Author: Dharma Balasubiramani

Documentation/devicetree/bindings/interrupt-controller/atmel,aic.txt

@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/atmel,aic.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Advanced Interrupt Controller (AIC)
+
+maintainers:
+  - Nicolas Ferre <nicolas.ferre@microchip.com>
+  - Dharma balasubiramani <dharma.b@microchip.com>
+
+description:
+  The Advanced Interrupt Controller (AIC) is an 8-level priority, individually
+  maskable, vectored interrupt controller providing handling of up to one
+  hundred and twenty-eight interrupt sources.
+
+properties:
+  compatible:
+    enum:
+      - atmel,at91rm9200-aic
+      - atmel,sama5d2-aic
+      - atmel,sama5d3-aic
+      - atmel,sama5d4-aic
+      - microchip,sam9x60-aic
+
+  reg:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  "#interrupt-cells":
+    const: 3
+    description: |
+      The 1st cell is the IRQ number (Peripheral IDentifier on datasheet).
+      The 2nd cell specifies flags:
+        bits[3:0] trigger type and level flags:
+          1 = low-to-high edge triggered.
+          2 = high-to-low edge triggered.
+          4 = active high level-sensitive.
+          8 = active low level-sensitive.
+        Valid combinations: 1, 2, 3, 4, 8.
+        Default for internal sources: 4 (active high).
+      The 3rd cell specifies irq priority from 0 (lowest) to 7 (highest).
+
+  interrupts:
+    maxItems: 1
+
+  atmel,external-irqs:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: u32 array of external irqs.
+
+allOf:
+  - $ref: /schemas/interrupt-controller.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: atmel,at91rm9200-aic
+    then:
+      properties:
+        atmel,external-irqs:
+          minItems: 1
+          maxItems: 7
+    else:
+      properties:
+        atmel,external-irqs:
+          minItems: 1
+          maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupt-controller
+  - "#interrupt-cells"
+  - atmel,external-irqs
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    interrupt-controller@fffff000 {
+      compatible = "atmel,at91rm9200-aic";
+      reg = <0xfffff000 0x200>;
+      interrupt-controller;
+      #interrupt-cells = <3>;
+      atmel,external-irqs = <31>;
+    };
+...