diff --git a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-graph-card.yaml b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-graph-card.yaml
index fc271f644aaf..249970952202 100644
--- a/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-graph-card.yaml
+++ b/Documentation/devicetree/bindings/sound/nvidia,tegra-audio-graph-card.yaml
@@ -45,6 +45,9 @@ properties:
     minItems: 1
     maxItems: 3
 
+  iommus:
+    maxItems: 1
+
 required:
   - clocks
   - clock-names