fdt_parent_offset
bootbus = fdt_parent_offset(initial_boot_params, cf);
bootbus = fdt_parent_offset(initial_boot_params, led);
return offset_devp(fdt_parent_offset(fdt, devp_offset(devp)));
parent = fdt_parent_offset(blob, node_offset);
parent = fdt_parent_offset(blob, node_offset);
nodeoffset = fdt_parent_offset(fdt, nodeoffset);
int fdt_parent_offset(const void *fdt, int nodeoffset);