diff --git a/sys/dev/dpaa2/dpaa2_mc.h b/sys/dev/dpaa2/dpaa2_mc.h
--- a/sys/dev/dpaa2/dpaa2_mc.h
+++ b/sys/dev/dpaa2/dpaa2_mc.h
@@ -179,6 +179,7 @@
 
 /* For bus interface. */
 
+struct rman *dpaa2_mc_rman(device_t mcdev, int type, u_int flags);
 struct resource * dpaa2_mc_alloc_resource(device_t mcdev, device_t child,
     int type, int *rid, rman_res_t start, rman_res_t end, rman_res_t count,
     u_int flags);
diff --git a/sys/dev/dpaa2/dpaa2_mc.c b/sys/dev/dpaa2/dpaa2_mc.c
--- a/sys/dev/dpaa2/dpaa2_mc.c
+++ b/sys/dev/dpaa2/dpaa2_mc.c
@@ -115,7 +115,6 @@
 
 static u_int dpaa2_mc_get_xref(device_t, device_t);
 static u_int dpaa2_mc_map_id(device_t, device_t, uintptr_t *);
-static struct rman *dpaa2_mc_rman(device_t, int);
 
 static int dpaa2_mc_alloc_msi_impl(device_t, device_t, int, int, int *);
 static int dpaa2_mc_release_msi_impl(device_t, device_t, int, int *);
@@ -312,10 +311,10 @@
 	struct rman *rm;
 	int error;
 
-	rm = dpaa2_mc_rman(mcdev, type);
-	if (!rm)
-		return (BUS_ALLOC_RESOURCE(device_get_parent(mcdev), child,
-		    type, rid, start, end, count, flags));
+	rm = dpaa2_mc_rman(mcdev, type, flags);
+	if (rm == NULL)
+		return (bus_generic_alloc_resource(mcdev, child, type, rid,
+		    start, end, count, flags));
 
 	/*
 	 * Skip managing DPAA2-specific resource. It must be provided to MC by
@@ -331,24 +330,10 @@
 		}
 	}
 
-	res = rman_reserve_resource(rm, start, end, count, flags, child);
-	if (!res) {
-		device_printf(mcdev, "rman_reserve_resource() failed: "
-		    "start=%#jx, end=%#jx, count=%#jx\n", start, end, count);
+	res = bus_generic_rman_alloc_resource(mcdev, child, type, rid, start,
+	    end, count, flags);
+	if (res == NULL)
 		goto fail;
-	}
-
-	rman_set_rid(res, *rid);
-
-	if (flags & RF_ACTIVE) {
-		if (bus_activate_resource(child, type, *rid, res)) {
-			device_printf(mcdev, "bus_activate_resource() failed: "
-			    "rid=%d, res=%#jx\n", *rid, (uintmax_t) res);
-			rman_release_resource(res);
-			goto fail;
-		}
-	}
-
 	return (res);
  fail:
 	device_printf(mcdev, "%s() failed: type=%d, rid=%d, start=%#jx, "
@@ -363,9 +348,10 @@
 {
 	struct rman *rm;
 
-	rm = dpaa2_mc_rman(mcdev, type);
+	rm = dpaa2_mc_rman(mcdev, type, rman_get_flags(r));
 	if (rm)
-		return (rman_adjust_resource(r, start, end));
+		return (bus_generic_rman_adjust_resource(mcdev, child, type, r,
+		    start, end));
 	return (bus_generic_adjust_resource(mcdev, child, type, r, start, end));
 }
 
@@ -375,12 +361,10 @@
 {
 	struct rman *rm;
 
-	rm = dpaa2_mc_rman(mcdev, type);
-	if (rm) {
-		KASSERT(rman_is_region_manager(r, rm), ("rman mismatch"));
-		rman_release_resource(r);
-	}
-
+	rm = dpaa2_mc_rman(mcdev, type, rman_get_flags(r));
+	if (rm)
+		return (bus_generic_rman_release_resource(mcdev, child, type,
+		    rid, r));
 	return (bus_generic_release_resource(mcdev, child, type, rid, r));
 }
 
@@ -388,26 +372,26 @@
 dpaa2_mc_activate_resource(device_t mcdev, device_t child, int type, int rid,
     struct resource *r)
 {
-	int rc;
-
-	if ((rc = rman_activate_resource(r)) != 0)
-		return (rc);
+	struct rman *rm;
 
-	return (BUS_ACTIVATE_RESOURCE(device_get_parent(mcdev), child, type,
-	    rid, r));
+	rm = dpaa2_mc_rman(mcdev, type, rman_get_flags(r));
+	if (rm)
+		return (bus_generic_rman_activate_resource(mcdev, child, type,
+		    rid, r));
+	return (bus_generic_activate_resource(mcdev, child, type, rid, r));
 }
 
 int
 dpaa2_mc_deactivate_resource(device_t mcdev, device_t child, int type, int rid,
     struct resource *r)
 {
-	int rc;
-
-	if ((rc = rman_deactivate_resource(r)) != 0)
-		return (rc);
+	struct rman *rm;
 
-	return (BUS_DEACTIVATE_RESOURCE(device_get_parent(mcdev), child, type,
-	    rid, r));
+	rm = dpaa2_mc_rman(mcdev, type, rman_get_flags(r));
+	if (rm)
+		return (bus_generic_rman_deactivate_resource(mcdev, child, type,
+		    rid, r));
+	return (bus_generic_deactivate_resource(mcdev, child, type, rid, r));
 }
 
 /*
@@ -498,7 +482,7 @@
 
 	if (flags & DPAA2_MC_DEV_ALLOCATABLE) {
 		/* Select rman based on a type of the DPAA2 device. */
-		rm = dpaa2_mc_rman(mcdev, dinfo->dtype);
+		rm = dpaa2_mc_rman(mcdev, dinfo->dtype, 0);
 		if (!rm)
 			return (ENOENT);
 		/* Manage DPAA2 device as an allocatable resource. */
@@ -523,7 +507,7 @@
 		return (EINVAL);
 
 	/* Select resource manager based on a type of the DPAA2 device. */
-	rm = dpaa2_mc_rman(mcdev, devtype);
+	rm = dpaa2_mc_rman(mcdev, devtype, 0);
 	if (!rm)
 		return (ENOENT);
 	/* Find first free DPAA2 device of the given type. */
@@ -749,8 +733,8 @@
  * @internal
  * @brief Obtain a resource manager based on the given type of the resource.
  */
-static struct rman *
-dpaa2_mc_rman(device_t mcdev, int type)
+struct rman *
+dpaa2_mc_rman(device_t mcdev, int type, u_int flags)
 {
 	struct dpaa2_mc_softc *sc;
 
diff --git a/sys/dev/dpaa2/dpaa2_mc_acpi.c b/sys/dev/dpaa2/dpaa2_mc_acpi.c
--- a/sys/dev/dpaa2/dpaa2_mc_acpi.c
+++ b/sys/dev/dpaa2/dpaa2_mc_acpi.c
@@ -352,6 +352,7 @@
 	DEVMETHOD(device_detach,	dpaa2_mc_detach),
 
 	/* Bus interface */
+	DEVMETHOD(bus_get_rman,		dpaa2_mc_rman),
 	DEVMETHOD(bus_alloc_resource,	dpaa2_mc_alloc_resource),
 	DEVMETHOD(bus_adjust_resource,	dpaa2_mc_adjust_resource),
 	DEVMETHOD(bus_release_resource,	dpaa2_mc_release_resource),
diff --git a/sys/dev/dpaa2/dpaa2_mc_fdt.c b/sys/dev/dpaa2/dpaa2_mc_fdt.c
--- a/sys/dev/dpaa2/dpaa2_mc_fdt.c
+++ b/sys/dev/dpaa2/dpaa2_mc_fdt.c
@@ -355,6 +355,7 @@
 	DEVMETHOD(device_detach,	dpaa2_mc_detach),
 
 	/* Bus interface */
+	DEVMETHOD(bus_get_rman,		dpaa2_mc_rman),
 	DEVMETHOD(bus_alloc_resource,	dpaa2_mc_alloc_resource),
 	DEVMETHOD(bus_adjust_resource,	dpaa2_mc_adjust_resource),
 	DEVMETHOD(bus_release_resource,	dpaa2_mc_release_resource),