diff --git a/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml b/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
index 51e597ba7db2..41aee1655b0c 100644
--- a/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
+++ b/Documentation/devicetree/bindings/watchdog/samsung-wdt.yaml
@@ -74,24 +74,7 @@ allOf:
           contains:
             enum:
               - google,gs101-wdt
-              - samsung,exynos5250-wdt
-              - samsung,exynos5420-wdt
-              - samsung,exynos7-wdt
               - samsung,exynos850-wdt
-              - samsung,exynos990-wdt
-              - samsung,exynosautov9-wdt
-              - samsung,exynosautov920-wdt
-    then:
-      required:
-        - samsung,syscon-phandle
-  - if:
-      properties:
-        compatible:
-          contains:
-            enum:
-              - google,gs101-wdt
-              - samsung,exynos850-wdt
-              - samsung,exynos990-wdt
               - samsung,exynosautov9-wdt
               - samsung,exynosautov920-wdt
     then:
@@ -104,9 +87,41 @@ allOf:
           items:
             - const: watchdog
             - const: watchdog_src
+        samsung,cluster-index:
+          enum: [0, 1]
       required:
         - samsung,cluster-index
-    else:
+        - samsung,syscon-phandle
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - samsung,exynos990-wdt
+    then:
+      properties:
+        clocks:
+          items:
+            - description: Bus clock, used for register interface
+            - description: Source clock (driving watchdog counter)
+        clock-names:
+          items:
+            - const: watchdog
+            - const: watchdog_src
+      required:
+        - samsung,cluster-index
+        - samsung,syscon-phandle
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - samsung,exynos5250-wdt
+              - samsung,exynos5420-wdt
+              - samsung,exynos7-wdt
+    then:
       properties:
         clocks:
           items:
@@ -115,6 +130,25 @@ allOf:
           items:
             - const: watchdog
         samsung,cluster-index: false
+      required:
+        - samsung,syscon-phandle
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - samsung,s3c6410-wdt
+    then:
+      properties:
+        clocks:
+          items:
+            - description: Bus clock, which is also a source clock
+        clock-names:
+          items:
+            - const: watchdog
+        samsung,cluster-index: false
+        samsung,syscon-phandle: false
 
 unevaluatedProperties: false