PCFCLOCK_NAME
dev = device_find_child(parent, PCFCLOCK_NAME, DEVICE_UNIT_ANY);
BUS_ADD_CHILD(parent, 0, PCFCLOCK_NAME, DEVICE_UNIT_ANY);
UID_ROOT, GID_WHEEL, 0400, PCFCLOCK_NAME "%d", unit);
PCFCLOCK_NAME,
.d_name = PCFCLOCK_NAME,