ofw_bus_find_child_device_by_phandle
childdev = ofw_bus_find_child_device_by_phandle(bus, child);
childdev = ofw_bus_find_child_device_by_phandle(bus, child);
childdev = ofw_bus_find_child_device_by_phandle(bus, child);
device_t ofw_bus_find_child_device_by_phandle(device_t bus, phandle_t node);