dt-bindings: timer: renesas: mtu2: Convert to json-schema

Convert the Renesas Multi-Function Timer Pulse Unit 2 (MTU2) Device Tree
binding documentation to json-schema.

Add missing properties.
Update the example to match reality.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Rob Herring <[email protected]>

Author: geertu

Documentation/devicetree/bindings/timer/renesas,mtu2.txt

@@ -0,0 +1,76 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/renesas,mtu2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Multi-Function Timer Pulse Unit 2 (MTU2)
+
+maintainers:
+  - Geert Uytterhoeven <[email protected]>
+  - Laurent Pinchart <[email protected]>
+
+description:
+  The MTU2 is a multi-purpose, multi-channel timer/counter with configurable clock inputs
+  and programmable compare match.
+
+  Channels share hardware resources but their counter and compare match value are
+  independent. The MTU2 hardware supports five channels indexed from 0 to 4.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,mtu2-r7s72100 # RZ/A1H
+      - const: renesas,mtu2
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+    maxItems: 5
+    description: One entry for each enabled channel.
+
+  interrupt-names:
+    minItems: 1
+    items:
+      - const: tgi0a
+      - const: tgi1a
+      - const: tgi2a
+      - const: tgi3a
+      - const: tgi4a
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: fck
+
+  power-domains:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/r7s72100-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    mtu2: timer@fcff0000 {
+            compatible = "renesas,mtu2-r7s72100", "renesas,mtu2";
+            reg = <0xfcff0000 0x400>;
+            interrupts = <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+            interrupt-names = "tgi0a";
+            clocks = <&mstp3_clks R7S72100_CLK_MTU2>;
+            clock-names = "fck";
+            power-domains = <&cpg_clocks>;
+    };