--- zzzz-none-000/linux-4.4.60/arch/arm64/include/asm/device.h	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/arch/arm64/include/asm/device.h	2021-02-04 17:41:59.000000000 +0000
@@ -21,6 +21,7 @@
 #ifdef CONFIG_IOMMU_API
 	void *iommu;			/* private IOMMU data */
 #endif
+	struct dma_iommu_mapping	*mapping;
 	bool dma_coherent;
 };