dt-bindings: timer: Convert st,spear-timer to DT schema

Convert the ST SPEAr Timer binding to DT schema format. It's a
straight-forward conversion.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250506022326.2589389-1-robh@kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Author: robherring

Documentation/devicetree/bindings/timer/st,spear-timer.txt

@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/timer/st,spear-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPEAr ARM Timer
+
+maintainers:
+  - Viresh Kumar <vireshk@kernel.org>
+  - Shiraz Hashim <shiraz.linux.kernel@gmail.com>
+
+properties:
+  compatible:
+    const: st,spear-timer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    timer@f0000000 {
+        compatible = "st,spear-timer";
+        reg = <0xf0000000 0x400>;
+        interrupts = <2>;
+    };