s390rtc_read
if (s390rtc_read(sc, S390_STATUS1, reg, sizeof(reg)))
if (s390rtc_read(sc, S390_STATUS2, reg, sizeof(reg)))
if ((error = s390rtc_read(sc, S390_REALTIME1, bcd,
static int s390rtc_read(struct s390rtc_softc *, int, uint8_t *, size_t);