diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index 5a6a81863f6c..98953c440dcc 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -1299,6 +1299,8 @@
 		iommu_enabled = <1>;
 		dev_mode = <0>;
 		status = "disabled";
+		/* 0 means ion, 1 means drm */
+		allocator = <1>;
 	};
 
 	vpu_mmu: iommu@ff9a0800 {
@@ -1338,6 +1340,8 @@
 		iommus = <&hevc_mmu>;
 		iommu_enabled = <1>;
 		status = "disabled";
+		/* 0 means ion, 1 means drm */
+		allocator = <1>;
 	};
 
 	hevc_mmu: iommu@ff9c0440 {