diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.yaml b/Documentation/devicetree/bindings/ata/ahci-platform.yaml
index ef19468e3022..cc35cdc02840 100644
--- a/Documentation/devicetree/bindings/ata/ahci-platform.yaml
+++ b/Documentation/devicetree/bindings/ata/ahci-platform.yaml
@@ -84,6 +84,9 @@ properties:
     minItems: 1
     maxItems: 3
 
+  iommus:
+    maxItems: 1
+
 patternProperties:
   "^sata-port@[0-9a-f]+$":
     $ref: /schemas/ata/ahci-common.yaml#/$defs/ahci-port