Testing under way.
Everything but SPI has been validated. SPI and UART tests still need to be written and added to the minnow-max-test suite.
Still pending SPI and UART tests, but the *very basic* test suite is available here: http://git.infradead.org/users/dvhart/minnow-max-test.git
Thanks to John Hawley and Chiau Ee Chew, we have successfully tested the MCP3204 driver with the Calamari Lure, and moving the linear potentiometer results in IIO value changes in sysfs. That completes testing for SPI.