Jonathan, Thanks for the information. It appears my original email was sent with an old @ieee.org alias, meaning I never received the reply since that alias is currently inactive. My end goal is get an 8-channel ADC working with >100ksps/channel. That doesn't seem do-able without an FPGA/PRU/real-time coprocessor to offload the SPI controller to for an IIO-based approach. So now I'm researching how to do something similar, but with the ASoC framework instead of iio, using a different ADC that supports DAIs like NXP SAI and TI McASP. But I'm running into issues there too with learning how to configure simple-sound-card and a dummy-codec, but I suppose my questions there should to go to the ALSA mailing list. Starting to wonder though if I do need to go PRU/real-time coprocessor route e,g., Cortex-M4 on same die as microprocessor (e.g, IMX8 and M4, STM32MP1 A7 w/ M4, AM3358 w/ PRU, etc.). Thanks, Alex.
