diff --git a/sys/arm/freescale/imx/imx_wdog.c b/sys/arm/freescale/imx/imx_wdog.c
index cbd171f3263e..e5f801dee8bc 100644
--- a/sys/arm/freescale/imx/imx_wdog.c
+++ b/sys/arm/freescale/imx/imx_wdog.c
@@ -54,8 +54,6 @@ __FBSDID("$FreeBSD$");
 struct imx_wdog_softc {
 	struct mtx		sc_mtx;
 	device_t		sc_dev;
-	bus_space_tag_t		sc_bst;
-	bus_space_handle_t	sc_bsh;
 	struct resource		*sc_res[2];
 	uint32_t		sc_timeout;
 };
@@ -63,9 +61,12 @@ struct imx_wdog_softc {
 static struct resource_spec imx_wdog_spec[] = {
 	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
 	{ SYS_RES_IRQ,		0,	RF_ACTIVE },
-	{ -1, 0 }
+	RESOURCE_SPEC_END
 };
 
+#define	MEMRES	0
+#define	IRQRES	1
+
 static struct ofw_compat_data compat_data[] = {
 	{"fsl,imx6sx-wdt", 1},
 	{"fsl,imx6sl-wdt", 1},
@@ -80,28 +81,19 @@ static struct ofw_compat_data compat_data[] = {
 	{NULL,             0}
 };
 
-static void	imx_watchdog(void *, u_int, int *);
-static int	imx_wdog_probe(device_t);
-static int	imx_wdog_attach(device_t);
+static inline uint16_t
+RD2(struct imx_wdog_softc *sc, bus_size_t offs)
+{
 
-static device_method_t imx_wdog_methods[] = {
-	DEVMETHOD(device_probe,		imx_wdog_probe),
-	DEVMETHOD(device_attach,	imx_wdog_attach),
-	DEVMETHOD_END
-};
+	return bus_read_2(sc->sc_res[MEMRES], offs);
+}
 
-static driver_t imx_wdog_driver = {
-	"imx_wdog",
-	imx_wdog_methods,
-	sizeof(struct imx_wdog_softc),
-};
-static devclass_t imx_wdog_devclass;
-DRIVER_MODULE(imx_wdog, simplebus, imx_wdog_driver, imx_wdog_devclass, 0, 0);
+static inline void
+WR2(struct imx_wdog_softc *sc, bus_size_t offs, uint16_t val)
+{
 
-#define	RD2(_sc, _r)							\
-		bus_space_read_2((_sc)->sc_bst, (_sc)->sc_bsh, (_r))
-#define	WR2(_sc, _r, _v)						\
-		bus_space_write_2((_sc)->sc_bst, (_sc)->sc_bsh, (_r), (_v))
+	return bus_write_2(sc->sc_res[MEMRES], offs, val);
+}
 
 static void
 imx_watchdog(void *arg, u_int cmd, int *error)
@@ -165,12 +157,24 @@ imx_wdog_attach(device_t dev)
 
 	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), "imx_wdt", MTX_DEF);
 
-	sc->sc_dev = dev;
-	sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
-	sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
-
 	/* TODO: handle interrupt */
 
 	EVENTHANDLER_REGISTER(watchdog_list, imx_watchdog, sc, 0);
 	return (0);
 }
+
+static device_method_t imx_wdog_methods[] = {
+	DEVMETHOD(device_probe,		imx_wdog_probe),
+	DEVMETHOD(device_attach,	imx_wdog_attach),
+	DEVMETHOD_END
+};
+
+static driver_t imx_wdog_driver = {
+	"imx_wdog",
+	imx_wdog_methods,
+	sizeof(struct imx_wdog_softc),
+};
+
+static devclass_t imx_wdog_devclass;
+
+DRIVER_MODULE(imx_wdog, simplebus, imx_wdog_driver, imx_wdog_devclass, 0, 0);