diff --git a/qcom/sa8155.dtsi b/qcom/sa8155.dtsi
index 62b94a170b07..16db15f09860 100644
--- a/qcom/sa8155.dtsi
+++ b/qcom/sa8155.dtsi
@@ -130,6 +130,7 @@
 		ethqos_emb_smmu: ethqos_emb_smmu {
 			compatible = "qcom,emac-smmu-embedded";
 			iommus = <&apps_smmu 0x3C0 0x0>;
+			qcom,iommu-dma = "fastmap";
 			qcom,iommu-dma-addr-pool = <0x80000000 0x40000000>;
 		};
 	};