AR_PHY_SPECTRAL_SCAN_PERIOD
val &= ~AR_PHY_SPECTRAL_SCAN_PERIOD;
val |= SM(ss->ss_period, AR_PHY_SPECTRAL_SCAN_PERIOD);
ss->ss_period = MS(val, AR_PHY_SPECTRAL_SCAN_PERIOD);
val &= ~AR_PHY_SPECTRAL_SCAN_PERIOD;
val |= SM(ss->ss_period, AR_PHY_SPECTRAL_SCAN_PERIOD);