diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
index 14945ebc31d2..0424b06cb655 100644
--- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
+++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
@@ -89,6 +89,9 @@ properties:
         - tx
         - rx
 
+  iommus:
+    maxItems: 1
+
   power-domains:
     maxItems: 1