dt-bindings: timer: Convert mrvl,mmp-timer to json-schema

A straightforward conversion of the mrvl,mmp-timer binding to DT schema
format using json-schema.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Link: https://lore.kernel.org/r/20200616223353.993567-6-lkundrak@v3.skSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/timer/mrvl,mmp-timer.txt

-* Marvell MMP Timer controller
-
-Required properties:
-- compatible : Should be "mrvl,mmp-timer".
-- reg : Address and length of the register set of timer controller.
-- interrupts : Should be the interrupt number.
-
-Optional properties:
-- clocks : Should contain a single entry describing the clock input.
-
-Example:
-	timer0: timer@d4014000 {
-		compatible = "mrvl,mmp-timer";
-		reg = <0xd4014000 0x100>;
-		interrupts = <13>;
-		clocks = <&coreclk 2>;
-	};

Documentation/devicetree/bindings/timer/mrvl,mmp-timer.yaml

+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/mrvl,mmp-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell MMP Timer bindings
+
+maintainers:
+  - Daniel Lezcano <daniel.lezcano@linaro.org>
+  - Thomas Gleixner <tglx@linutronix.de>
+  - Rob Herring <robh+dt@kernel.org>
+
+properties:
+  $nodename:
+    pattern: '^timer@[a-f0-9]+$'
+
+  compatible:
+    const: mrvl,mmp-timer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    timer@d4014000 {
+        compatible = "mrvl,mmp-timer";
+        reg = <0xd4014000 0x100>;
+        interrupts = <13>;
+        clocks = <&coreclk 2>;
+    };
+
+...