dt-bindings: timer: Convert socionext,milbeaut-timer to DT schema

Convert the Socionext Milbeaut 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/20250506022322.2589193-1-robh@kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/timer/socionext,milbeaut-timer.txt

@@ -1,17 +0,0 @@
-Milbeaut SoCs Timer Controller
-
-Required properties:
-
-- compatible : should be "socionext,milbeaut-timer".
-- reg : Specifies base physical address and size of the registers.
-- interrupts : The interrupt of the first timer.
-- clocks: phandle to the input clk.
-
-Example:
-
-timer {
-	compatible = "socionext,milbeaut-timer";
-	reg = <0x1e000050 0x20>
-	interrupts = <0 91 4>;
-	clocks = <&clk 4>;
-};

Documentation/devicetree/bindings/timer/socionext,milbeaut-timer.yaml

@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/socionext,milbeaut-timer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Milbeaut SoCs Timer Controller
+
+maintainers:
+  - Sugaya Taichi <sugaya.taichi@socionext.com>
+
+properties:
+  compatible:
+    const: socionext,milbeaut-timer
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    timer@1e000050 {
+        compatible = "socionext,milbeaut-timer";
+        reg = <0x1e000050 0x20>;
+        interrupts = <0 91 4>;
+        clocks = <&clk 4>;
+    };