NCT6775_REG_FANDIV2
u16 fandiv_reg = nr < 2 ? NCT6775_REG_FANDIV1 : NCT6775_REG_FANDIV2;
err = nct6775_read_value(data, NCT6775_REG_FANDIV2, &i);
err = nct6775_read_value(data, NCT6775_REG_FANDIV2, &tmp);
err = nct6775_write_value(data, NCT6775_REG_FANDIV2, data->fandiv2);