fdt_first_property_offset
int fdt_first_property_offset(const void *fdt, int nodeoffset);
for (property = fdt_first_property_offset(fdt, node); \
for (offset = fdt_first_property_offset(fdt, offset);
for (int prop = fdt_first_property_offset(fdt, node); prop >= 0; prop = fdt_next_property_offset(fdt, prop)) {