diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
index e0b88a71356a..cb8dceaca70e 100644
--- a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
+++ b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml
@@ -55,6 +55,9 @@ properties:
       - const: apb_pclk
       - const: atclk
 
+  iommus:
+    maxItems: 1
+
   power-domains:
     maxItems: 1