diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
index 9a545087d70e..7474cddf7ad3 100644
--- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
@@ -1755,6 +1755,9 @@ pcie0: pcie@1c00000 {
 					<&gem_noc MASTER_APPSS_PROC 0 &cnoc_main SLAVE_PCIE_0 0>;
 			interconnect-names = "pcie-mem", "cpu-pcie";
 
+			/* Entries are reversed due to the unusual ITS DeviceID encoding */
+			msi-map = <0x0 &gic_its 0x1401 0x1>,
+				  <0x100 &gic_its 0x1400 0x1>;
 			iommu-map = <0x0   &apps_smmu 0x1400 0x1>,
 				    <0x100 &apps_smmu 0x1401 0x1>;
 
@@ -1864,6 +1867,9 @@ pcie1: pcie@1c08000 {
 					<&gem_noc MASTER_APPSS_PROC 0 &cnoc_main SLAVE_PCIE_1 0>;
 			interconnect-names = "pcie-mem", "cpu-pcie";
 
+			/* Entries are reversed due to the unusual ITS DeviceID encoding */
+			msi-map = <0x0 &gic_its 0x1481 0x1>,
+				  <0x100 &gic_its 0x1480 0x1>;
 			iommu-map = <0x0   &apps_smmu 0x1480 0x1>,
 				    <0x100 &apps_smmu 0x1481 0x1>;