dt-bindings: watchdog: Convert TS-4800 to DT schema

Convert the Technologic Systems TS-4800 watchdog timer bindings
to DT schema.

Signed-off-by: Eduard Bostina <egbostina@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20260323175948.302441-2-egbostina@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/watchdog/technologic,ts4800-wdt.yaml

@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/technologic,ts4800-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Technologic Systems TS-4800 Watchdog
+
+maintainers:
+  - Eduard Bostina <egbostina@gmail.com>
+
+properties:
+  compatible:
+    const: technologic,ts4800-wdt
+
+  syscon:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    items:
+      - items:
+          - description: Phandle to the FPGA's syscon
+          - description: Offset to the watchdog register
+    description: Phandle / integers array that points to the syscon node which
+      describes the FPGA's syscon registers.
+
+required:
+  - compatible
+  - syscon
+
+allOf:
+  - $ref: watchdog.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+      watchdog {
+        compatible = "technologic,ts4800-wdt";
+        syscon = <&syscon 0xe>;
+        timeout-sec = <10>;
+      };

Documentation/devicetree/bindings/watchdog/ts4800-wdt.txt

@@ -1,25 +0,0 @@
-Technologic Systems Watchdog
-
-Required properties:
-- compatible: must be "technologic,ts4800-wdt"
-- syscon: phandle / integer array that points to the syscon node which
-          describes the FPGA's syscon registers.
-          - phandle to FPGA's syscon
-          - offset to the watchdog register
-
-Optional property:
-- timeout-sec: contains the watchdog timeout in seconds.
-
-Example:
-
-syscon: syscon@b0010000 {
-	compatible = "syscon", "simple-mfd";
-	reg = <0xb0010000 0x3d>;
-	reg-io-width = <2>;
-
-	wdt@e {
-		compatible = "technologic,ts4800-wdt";
-		syscon = <&syscon 0xe>;
-		timeout-sec = <10>;
-	};
-}