diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 2ae5a6058a34..5ff8982712e0 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -223,10 +223,7 @@ struct mtk_iommu_data {
 	struct device			*smicomm_dev;
 
 	struct mtk_iommu_bank_data	*bank;
-
-	struct dma_iommu_mapping	*mapping; /* For mtk_iommu_v1.c */
 	struct regmap			*pericfg;
-
 	struct mutex			mutex; /* Protect m4u_group/m4u_dom above */
 
 	/*