dt-bindings: watchdog: Add watchdog yaml file for Sunplus SP7021

This adds the documentation for the devicetree bindings of the Sunplus
SP7021 watchdog driver, found from SP7021 SoCs and newer.

Signed-off-by: Xiantao Hu <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>

Author: Xiantao Hu

Documentation/devicetree/bindings/watchdog/sunplus,sp7021-wdt.yaml

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) Sunplus Co., Ltd. 2021
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/sunplus,sp7021-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sunplus SoCs Watchdog
+
+maintainers:
+  - XianTao Hu <[email protected]>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    const: sunplus,sp7021-wdt
+
+  reg:
+    items:
+      - description: watchdog registers regions
+      - description: miscellaneous control registers regions
+
+  clocks:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    watchdog: watchdog@9c000630 {
+        compatible = "sunplus,sp7021-wdt";
+        reg = <0x9c000630 0x08>, <0x9c000274 0x04>;
+        clocks = <&clkc 0x24>;
+        resets = <&rstc 0x14>;
+    };
+...

MAINTAINERS

@@ -18902,6 +18902,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/serial/sunplus,sp7021-uart.yaml
 F:	drivers/tty/serial/sunplus-uart.c
 
+SUNPLUS WATCHDOG DRIVER
+M:	Xiantao Hu <[email protected]>
+L:	[email protected]
+S:	Maintained
+F:	Documentation/devicetree/bindings/watchdog/sunplus,sp7021-wdt.yaml
+
 SUPERH
 M:	Yoshinori Sato <[email protected]>
 M:	Rich Felker <[email protected]>