diff --git a/sys/dev/gpio/gpiobus.c b/sys/dev/gpio/gpiobus.c
--- a/sys/dev/gpio/gpiobus.c
+++ b/sys/dev/gpio/gpiobus.c
@@ -693,8 +693,9 @@
 	return (0);
 }
 
-static device_t
-gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
+device_t
+gpiobus_add_child_common(device_t dev, u_int order, const char *name, int unit,
+    size_t ivars_size)
 {
 	device_t child;
 	struct gpiobus_ivar *devi;
@@ -702,7 +703,7 @@
 	child = device_add_child_ordered(dev, order, name, unit);
 	if (child == NULL) 
 		return (child);
-	devi = malloc(sizeof(struct gpiobus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
+	devi = malloc(ivars_size, M_DEVBUF, M_NOWAIT | M_ZERO);
 	if (devi == NULL) {
 		device_delete_child(dev, child);
 		return (NULL);
@@ -713,6 +714,13 @@
 	return (child);
 }
 
+static device_t
+gpiobus_add_child(device_t dev, u_int order, const char *name, int unit)
+{
+	return (gpiobus_add_child_common(dev, order, name, unit,
+	    sizeof(struct gpiobus_ivar)));
+}
+
 static void
 gpiobus_child_deleted(device_t dev, device_t child)
 {
diff --git a/sys/dev/gpio/gpiobus_internal.h b/sys/dev/gpio/gpiobus_internal.h
--- a/sys/dev/gpio/gpiobus_internal.h
+++ b/sys/dev/gpio/gpiobus_internal.h
@@ -42,6 +42,7 @@
 int gpiobus_read_ivar(device_t, device_t, int, uintptr_t *);
 int gpiobus_acquire_pin(device_t, uint32_t);
 void gpiobus_release_pin(device_t, uint32_t);
+device_t gpiobus_add_child_common(device_t, u_int, const char *, int, size_t);
 
 extern driver_t gpiobus_driver;
 #endif
diff --git a/sys/dev/gpio/ofw_gpiobus.c b/sys/dev/gpio/ofw_gpiobus.c
--- a/sys/dev/gpio/ofw_gpiobus.c
+++ b/sys/dev/gpio/ofw_gpiobus.c
@@ -451,28 +451,22 @@
 	device_t child;
 	struct ofw_gpiobus_devinfo *devi;
 
-	child = device_add_child_ordered(dev, order, name, unit);
+	child = gpiobus_add_child_common(dev, order, name, unit,
+	    sizeof(struct ofw_gpiobus_devinfo));
 	if (child == NULL)
-		return (child);
-	devi = malloc(sizeof(struct ofw_gpiobus_devinfo), M_DEVBUF,
-	    M_NOWAIT | M_ZERO);
-	if (devi == NULL) {
-		device_delete_child(dev, child);
-		return (0);
-	}
+		return (NULL);
 
 	/*
 	 * NULL all the OFW-related parts of the ivars for non-OFW
 	 * children.
 	 */
+	devi = device_get_ivars(child);
 	devi->opd_obdinfo.obd_node = -1;
 	devi->opd_obdinfo.obd_name = NULL;
 	devi->opd_obdinfo.obd_compat = NULL;
 	devi->opd_obdinfo.obd_type = NULL;
 	devi->opd_obdinfo.obd_model = NULL;
 
-	device_set_ivars(child, devi);
-
 	return (child);
 }