RTC_CENTURY_MASK   40 drivers/rtc/rtc-ds1553.c #define RTC_CENTURY_MASK	0x3f
RTC_CENTURY_MASK   36 drivers/rtc/rtc-ds1742.c #define RTC_CENTURY_MASK	0x3f
RTC_CENTURY_MASK  129 include/linux/rtc/ds1685.h #define RTC_CENTURY_MASK	0xff	/* x x x x x x x x */