year_mon_day       54 arch/powerpc/include/asm/opal.h int64_t opal_tpo_read(uint64_t token, __be32 *year_mon_day, __be32 *hour_min);
year_mon_day       55 arch/powerpc/include/asm/opal.h int64_t opal_tpo_write(uint64_t token, uint32_t year_mon_day,