args: "dev0=/dev/sdr1,dev1=/dev/sdr2,dev2=/dev/sdr0"
args: "dev0=/dev/sdr1@0"

sample_hw_fmt
rx_antenna: auto/tx_rx, rx
sync: none / internal / gps / external
clock: internal / external

cpri_mult:        []int                     per card
cpri_mapping:     [](standard|hw|spread)    per card
fast_cm_pointer:  []int                     per card
ifname:           []ifname                  per card
vss_data          []...
cpri_rx_delay:    []int
cpri_tx_delay:    []int
cpri_tx_dbm:      []float