diff --git a/Documentation/devicetree/bindings/watchdog/watchdog.yaml b/Documentation/devicetree/bindings/watchdog/watchdog.yaml
index 519b48889eb14..f0a584af1223e 100644
--- a/Documentation/devicetree/bindings/watchdog/watchdog.yaml
+++ b/Documentation/devicetree/bindings/watchdog/watchdog.yaml
@@ -17,11 +17,11 @@ description: |
 select:
   properties:
     $nodename:
-      pattern: "^watchdog(@.*|-[0-9a-f])?$"
+      pattern: "^watchdog(@.*|-([0-9]|[1-9][0-9]+))?$"
 
 properties:
   $nodename:
-    pattern: "^(timer|watchdog)(@.*|-[0-9a-f])?$"
+    pattern: "^(timer|watchdog)(@.*|-([0-9]|[1-9][0-9]+))?$"
 
   timeout-sec:
     description: