finsio_writereg
static void finsio_writereg(bus_space_tag_t, bus_space_handle_t, int, int);
finsio_writereg(sc->sc_iot, ioh, FINSIO_FUNC_SEL, FINSIO_FUNC_HWMON);
finsio_writereg(sc->sc_iot, sc->sc_ioh, FINSIO_HWMON_CONF, cr | 0x3);