Hi Jinoj,
The following sequence should help you:
struct rf_rssi rssi;
rssi.ant = 0;
rssi.duration = 1;
ad9361_get_rx_rssi(ad9361_phy, 0, &rssi);
printf("rssi = %d.%02d dB\n", rssi.symbol / rssi.multiplier, rssi.symbol % rssi.multiplier);
Regards,
Dragos