diff --git a/plat/mediatek/drivers/iommu/mt8188/mtk_iommu_plat.h b/plat/mediatek/drivers/iommu/mt8188/mtk_iommu_plat.h
new file mode 100644
index 0000000..a59e0c7
--- /dev/null
+++ b/plat/mediatek/drivers/iommu/mt8188/mtk_iommu_plat.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022, MediaTek Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef IOMMU_PLAT_H
+#define IOMMU_PLAT_H
+
+#include <mtk_iommu_priv.h>
+
+/* mm iommu */
+#define SMI_LARB_NUM	(26)
+extern struct mtk_smi_larb_config *g_larb_cfg;
+
+/* infra iommu */
+#define MMU_DEV_NUM	(1)
+extern struct mtk_ifr_mst_config *g_ifr_mst_cfg;
+extern uint32_t *g_ifr_mst_cfg_base;
+extern uint32_t *g_ifr_mst_cfg_offs;
+
+extern void mtk_infra_iommu_enable_protect(void);
+
+#endif /* IOMMU_PLAT_H */