MKCLOCK_AP_STRIDE
bus_space_write_4(sc->sc_bst, sc->sc_bsh, off << MKCLOCK_AP_STRIDE, v);
((MK48T02_CLKOFF + MK48TXX_ICSR) << MKCLOCK_AP_STRIDE)
rv = bus_space_read_4(sc->sc_bst, sc->sc_bsh, off << MKCLOCK_AP_STRIDE);