dt-bindings: watchdog: Add MA35D1 Watchdog

Add device tree binding documentation for the watchdog timer (WDT)
controller found on Nuvoton MA35D1 SoC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Zi-Yu Chen <zychennvt@gmail.com>
Link: https://lore.kernel.org/r/20260804070351.1846165-2-zychennvt@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/watchdog/nuvoton,ma35d1-wdt.yaml

@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/nuvoton,ma35d1-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nuvoton MA35D1 Watchdog Timer
+
+maintainers:
+  - Zi-Yu Chen <zychennvt@gmail.com>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    enum:
+      - nuvoton,ma35d1-wdt
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  wakeup-source: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/nuvoton,ma35d1-clk.h>
+
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+        wdt1: watchdog@40440000 {
+          compatible = "nuvoton,ma35d1-wdt";
+          reg = <0x0 0x40440000 0x0 0x100>;
+          interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
+          clocks = <&clk WDT1_GATE>;
+        };
+    };
+...