dt-bindings: timer: Convert ARM timer bindings to json-schema

Convert ARM timers to DT schema format using json-schema.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/timer/arm,global_timer.yaml

@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/arm,global_timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM Global Timer
+
+maintainers:
+  - Stuart Menefy <stuart.menefy@st.com>
+
+description:
+  Cortex-A9 are often associated with a per-core Global timer.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - arm,cortex-a5-global-timer
+          - arm,cortex-a9-global-timer
+
+    description: driver supports versions r2p0 and above.
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+examples:
+  - |
+    timer@2c000600 {
+      compatible = "arm,cortex-a9-global-timer";
+      reg = <0x2c000600 0x20>;
+      interrupts = <1 13 0xf01>;
+      clocks = <&arm_periph_clk>;
+    };
+...