diff --git a/Documentation/devicetree/bindings/net/fsl,fec.yaml b/Documentation/devicetree/bindings/net/fsl,fec.yaml
index 8948a11c994e..5536c06139ca 100644
--- a/Documentation/devicetree/bindings/net/fsl,fec.yaml
+++ b/Documentation/devicetree/bindings/net/fsl,fec.yaml
@@ -224,6 +224,9 @@ properties:
       Can be omitted thus no delay is observed. Delay is in range of 1ms to 1000ms.
       Other delays are invalid.
 
+  iommus:
+    maxItems: 1
+
 required:
   - compatible
   - reg