dt-bindings: interrupt-controller: mediatek,cirq: Migrate to dt schema

Migrate mediatek,cirq.txt to dt schema as mediatek,mtk-cirq.yaml.
While at it, I've also fixed some typos that were present in the
original txt binding, as it was suggesting that the compatible
string would have "mediatek,cirq" as compatible but, in reality,
that's supposed to be "mediatek,mtk-cirq" instead.

Little rewording on property descriptions also happened for
them to be more concise.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221128092217.36552-2-angelogioacchino.delregno@collabora.com

Author: AngeloGioacchino Del Regno

Documentation/devicetree/bindings/interrupt-controller/mediatek,cirq.txt

@@ -0,0 +1,67 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/mediatek,mtk-cirq.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek System Interrupt Controller
+
+maintainers:
+  - Youlin Pei <youlin.pei@mediatek.com>
+
+description:
+  In MediaTek SoCs, the CIRQ is a low power interrupt controller designed to
+  work outside of MCUSYS which comprises with Cortex-Ax cores, CCI and GIC.
+  The external interrupts (outside MCUSYS) will feed through CIRQ and connect
+  to GIC in MCUSYS. When CIRQ is enabled, it will record the edge-sensitive
+  interrupts and generate a pulse signal to parent interrupt controller when
+  flush command is executed. With CIRQ, MCUSYS can be completely turned off
+  to improve the system power consumption without losing interrupts.
+
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - mediatek,mt2701-cirq
+          - mediatek,mt8135-cirq
+          - mediatek,mt8173-cirq
+      - const: mediatek,mtk-cirq
+
+  reg:
+    maxItems: 1
+
+  '#interrupt-cells':
+    const: 3
+
+  interrupt-controller: true
+
+  mediatek,ext-irq-range:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      - description: First CIRQ interrupt
+      - description: Last CIRQ interrupt
+    description:
+      Identifies the range of external interrupts in different SoCs
+
+required:
+  - compatible
+  - reg
+  - '#interrupt-cells'
+  - interrupt-controller
+  - mediatek,ext-irq-range
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    cirq: interrupt-controller@10204000 {
+        compatible = "mediatek,mt2701-cirq", "mediatek,mtk-cirq";
+        reg = <0x10204000 0x400>;
+        #interrupt-cells = <3>;
+        interrupt-controller;
+        interrupt-parent = <&sysirq>;
+        mediatek,ext-irq-range = <32 200>;
+    };