RTCSB_ALL_INTRS
KASSERT((vrtc->rtcdev.reg_b & RTCSB_ALL_INTRS) != 0,
if (changed & RTCSB_ALL_INTRS)
vrtc_set_reg_b(vrtc, rtc->reg_b & ~(RTCSB_ALL_INTRS | RTCSB_SQWE));