dt-bindings: watchdog: Add NXP Software Watchdog Timer

Describe the Software Watchdog Timer available on the S32G platforms.

Cc: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
Cc: Thomas Fossati <thomas.fossati@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250410082616.1855860-2-daniel.lezcano@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/devicetree/bindings/watchdog/nxp,s32g2-swt.yaml

@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/nxp,s32g2-swt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP Software Watchdog Timer (SWT)
+
+maintainers:
+  - Daniel Lezcano <daniel.lezcano@kernel.org>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - const: nxp,s32g2-swt
+      - items:
+          - const: nxp,s32g3-swt
+          - const: nxp,s32g2-swt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: Counter clock
+      - description: Module clock
+      - description: Register clock
+
+  clock-names:
+    items:
+      - const: counter
+      - const: module
+      - const: register
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    watchdog@40100000 {
+        compatible = "nxp,s32g2-swt";
+        reg = <0x40100000 0x1000>;
+        clocks = <&clks 0x3a>, <&clks 0x3b>, <&clks 0x3c>;
+        clock-names = "counter", "module", "register";
+        timeout-sec = <10>;
+    };