[PATCH v2 1/2] dt-bindings: watchdog: Add Loongson-1 watchdog

[Keguang Zhang <keguang.zhang@gmail.com>]

Add devicetree binding document for Loongson-1 watchdog.

Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
---
V1 -> V2: Replaced the wildcard compatible string with specific ones
          Use unevaluatedProperties instead of additionalProperties
          (suggested by Krzysztof Kozlowski)
---
 .../bindings/watchdog/loongson,ls1x-wdt.yaml  | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/watchdog/loongson,ls1x-wdt.yaml

diff --git a/Documentation/devicetree/bindings/watchdog/loongson,ls1x-wdt.yaml b/Documentation/devicetree/bindings/watchdog/loongson,ls1x-wdt.yaml
new file mode 100644
index 000000000000..81690d4b62a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/loongson,ls1x-wdt.yaml
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/watchdog/loongson,ls1x-wdt.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson-1 Watchdog Timer
+
+maintainers:
+  - Keguang Zhang <keguang.zhang@gmail.com>
+
+allOf:
+  - $ref: watchdog.yaml#
+
+properties:
+  compatible:
+    enum:
+      - loongson,ls1b-wdt
+      - loongson,ls1c-wdt
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/loongson,ls1x-clk.h>
+    watchdog: watchdog@1fe5c060 {
+        compatible = "loongson,ls1b-wdt";
+        reg = <0x1fe5c060 0xc>;
+
+        clocks = <&clkc LS1X_CLKID_APB>;
+    };
-- 
2.39.2