fdt_add_child
fdt_add_child(parent, child, faa, 0);
fdt_add_child(parent, child, faa, 0);
fdt_add_child(self, child, faa, 0);
fdt_add_child(bus, child, faa, fdt_get_order(child));
void fdt_add_child(device_t, int, struct fdt_attach_args *, u_int);