dt-bindings: interrupt-controller: Convert ti,keystone-irq to DT schema

Convert the TI Keystone 2 interrupt controller binding to schema format.
It's a straight-forward conversion of the typical interrupt controller.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: robherring

Documentation/devicetree/bindings/interrupt-controller/ti,keystone-irq.txt

@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ti,keystone-irq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Keystone 2 IRQ controller IP
+
+maintainers:
+  - Grygorii Strashko <[email protected]>
+
+description:
+  On Keystone SOCs, DSP cores can send interrupts to ARM host using the IRQ
+  controller IP. It provides 28 IRQ signals to ARM. The IRQ handler running on
+  HOST OS can identify DSP signal source by analyzing SRCCx bits in IPCARx
+  registers. This is one of the component used by the IPC mechanism used on
+  Keystone SOCs.
+
+properties:
+  compatible:
+    const: ti,keystone-irq
+
+  reg:
+    maxItems: 1
+
+  interrupt-controller: true
+
+  '#interrupt-cells':
+    const: 1
+
+  interrupts:
+    maxItems: 1
+
+  ti,syscon-dev:
+    description: Phandle and offset to syscon device
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: Phandle to syscon device control registers
+          - description: Offset to control register
+
+required:
+  - compatible
+  - reg
+  - interrupt-controller
+  - '#interrupt-cells'
+  - interrupts
+  - ti,syscon-dev
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    interrupt-controller@2a0 {
+      compatible = "ti,keystone-irq";
+      reg = <0x2a0 0x4>;
+      ti,syscon-dev = <&devctrl 0x2a0>;
+      interrupts = <GIC_SPI 4 IRQ_TYPE_EDGE_RISING>;
+      interrupt-controller;
+      #interrupt-cells = <1>;
+    };