Index: sys/arm64/iommu/iommu_if.m
===================================================================
--- sys/arm64/iommu/iommu_if.m
+++ sys/arm64/iommu/iommu_if.m
@@ -32,6 +32,8 @@
 # $FreeBSD$
 #
 
+#include "opt_platform.h"
+
 #include <sys/types.h>
 #include <sys/taskqueue.h>
 #include <sys/bus.h>
@@ -138,6 +140,7 @@
 	struct iommu_ctx	*ioctx;
 };
 
+#ifdef FDT
 #
 # Notify controller we have machine-dependent data.
 #
@@ -147,3 +150,4 @@
 	pcell_t *cells;
 	int ncells;
 };
+#endif
Index: sys/arm64/iommu/smmu_fdt.c
===================================================================
--- sys/arm64/iommu/smmu_fdt.c
+++ sys/arm64/iommu/smmu_fdt.c
@@ -202,7 +202,5 @@
 DEFINE_CLASS_1(smmu, smmu_fdt_driver, smmu_fdt_methods,
     sizeof(struct smmu_softc), smmu_driver);
 
-static devclass_t smmu_fdt_devclass;
-
-EARLY_DRIVER_MODULE(smmu, simplebus, smmu_fdt_driver, smmu_fdt_devclass,
-    0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
+EARLY_DRIVER_MODULE(smmu, simplebus, smmu_fdt_driver, 0, 0,
+    BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);