fdt_parent_offset
int fdt_parent_offset(const void *fdt, int nodeoffset);
int parent = fdt_parent_offset(fdt, node);
int parent = fdt_parent_offset(fdt, node);
node = fdt_parent_offset(gFDT, node);
nodeoffset = fdt_parent_offset(fdt, nodeoffset);
int parent = fdt_parent_offset(fdt, node);
int parent = fdt_parent_offset(fdt, node);
int parent = fdt_parent_offset(fdt, node);
node = fdt_parent_offset(fdt, node);