Index: sys/dev/mii/mii_fdt.c
===================================================================
--- sys/dev/mii/mii_fdt.c
+++ sys/dev/mii/mii_fdt.c
@@ -326,20 +326,6 @@
 	return (&ma->obd);
 }
 
-static ssize_t
-miibus_fdt_get_property(device_t bus, device_t child, const char *propname,
-    void *buf, size_t size)
-{
-	struct mii_attach_args *ma;
-
-	ma = device_get_ivars(child);
-
-	if (ma->obd.obd_node == 0)
-		return (-1);
-
-	return (OF_getencprop(ma->obd.obd_node, propname, buf, size));
-}
-
 static device_method_t miibus_fdt_methods[] = {
 	DEVMETHOD(device_probe,		miibus_fdt_probe),
 	DEVMETHOD(device_attach,	miibus_fdt_attach),
@@ -362,7 +348,6 @@
 	DEVMETHOD(bus_get_resource,		bus_generic_rl_get_resource),
 	DEVMETHOD(bus_set_resource,		bus_generic_rl_set_resource),
 	DEVMETHOD(bus_get_resource_list,	miibus_fdt_get_resource_list),
-	DEVMETHOD(bus_get_property,		miibus_fdt_get_property),
 
 	DEVMETHOD_END
 };
Index: sys/kern/bus_if.m
===================================================================
--- sys/kern/bus_if.m
+++ sys/kern/bus_if.m
@@ -77,12 +77,6 @@
 		return (0);
 	}
 
-	static ssize_t
-	null_get_property(device_t dev, device_t child, const char *propname,
-	    void *propvalue, size_t size)
-	{
-		return (-1);
-	}
 };
 
 /**
@@ -944,4 +938,4 @@
 	const char *_propname;
 	void *_propvalue;
 	size_t _size;
-} DEFAULT null_get_property;
+} DEFAULT bus_generic_get_property;
Index: sys/kern/subr_bus.c
===================================================================
--- sys/kern/subr_bus.c
+++ sys/kern/subr_bus.c
@@ -4125,6 +4125,23 @@
 	return (ENOENT);
 }
 
+/**
+ * @brief Helper function for implementing BUS_GET_PROPERTY().
+ *
+ * This simply calls the BUS_GET_PROPERTY of the parent of dev,
+ * until a non-default implementation is found.
+ */
+ssize_t
+bus_generic_get_property(device_t dev, device_t child, const char *propname,
+    void *propvalue, size_t size)
+{
+	if (device_get_parent(dev) != NULL)
+		return (BUS_GET_PROPERTY(device_get_parent(dev), child,
+		    propname, propvalue, size));
+
+	return (-1);
+}
+
 /**
  * @brief Stub function for implementing BUS_GET_RESOURCE_LIST().
  *
Index: sys/sys/bus.h
===================================================================
--- sys/sys/bus.h
+++ sys/sys/bus.h
@@ -443,6 +443,9 @@
 bus_space_tag_t
 	bus_generic_get_bus_tag(device_t dev, device_t child);
 int	bus_generic_get_domain(device_t dev, device_t child, int *domain);
+ssize_t bus_generic_get_property(device_t dev, device_t child,
+			    const char *propname, void *propvalue,
+			    size_t size);
 struct resource_list *
 	bus_generic_get_resource_list(device_t, device_t);
 int	bus_generic_map_resource(device_t dev, device_t child, int type,