diff --git a/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.yaml b/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.yaml
index eea822861804..682ccd76f5c2 100644
--- a/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.yaml
+++ b/Documentation/devicetree/bindings/mailbox/ti,secure-proxy.yaml
@@ -36,7 +36,7 @@ properties:
       - const: scfg
 
   reg:
-    minItems: 3
+    maxItems: 3
 
   interrupt-names:
     minItems: 1