[alsa-devel] mcasp: stream has more channels (2) than are enabled in mcasp (0)

I've got a Beaglebone Green with a custom cape (CODEC and amp and some other stuff).

Kernel 4.4.6-bone-rt-r6. When I load the overlay that should set up my CODEC in the device tree, I get the following in the log.

[ 367.172337] davinci-mcasp 48038000.mcasp: stream has more channels (2) than are enabled in mcasp (0) [ 367.172374] davinci-mcasp 48038000.mcasp: ASoC: can't set 48038000.mcasp hw params: -22

You can see a little more log context, along with the DTS, here:

http://pastebin.com/UPB1xjPF

Can anyone tell me what this means? Thanks!