POWMAN_PCFR
bus_space_write_4(sc->sc_iot, sc->sc_pm_ioh, POWMAN_PCFR, rv);
rv = bus_space_read_4(iot, ioh, POWMAN_PCFR);
bus_space_write_4(iot, ioh, POWMAN_PCFR, rv | PCFR_PI2C_EN);
rv = bus_space_read_4(iot, ioh, POWMAN_PCFR);
bus_space_write_4(iot, ioh, POWMAN_PCFR, rv & ~PCFR_FVC);
rv = bus_space_read_4(iot, ioh, POWMAN_PCFR);
bus_space_write_4(iot, ioh, POWMAN_PCFR,