I managed to get this working, thanks to a post on the alsa-devel forum:
http://mailman.alsa-project.org/pipermail/alsa-devel/2015-September/098022.html

By loading the overlay *before* the sound drivers, rather than after it now 
works.
from /boot/uEnv.txt:
##Example v4.1.x
#cape_disable=bone_capemgr.disable_partno=
cape_enable=bone_capemgr.enable_partno=BB-BONE-AUDI-02


On Wednesday, August 9, 2017 at 3:27:56 PM UTC-4, Mike Davis wrote:
>
> I have the same issue.
> I am running kernel debian with kernel 4.4.52-bone16
> I pulled down RobertCNelson's dtb-rebuilder from 
> https://github.com/RobertCNelson/dtb-rebuilder 
> <https://github.com/RobertCNelson/dtb-rebuilder/blob/4.1-ti/src/arm/am335x-boneblack-audio.dts#L17-L28>,
>  
> branch 4.4.x and rebuilt all the arm dtbs and installed them.
> Then added then updated my *base* dtb, which 
> is am335x-boneblack-emmc-overlay.dtb with the clock definitions 
> in am335x-boneblack-audio.dts, 
> as per 
> https://github.com/RobertCNelson/dtb-rebuilder/blob/4.1-ti/src/arm/am335x-boneblack-audio.dts#L17-L28
>  
> <https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2FRobertCNelson%2Fdtb-rebuilder%2Fblob%2F4.1-ti%2Fsrc%2Farm%2Fam335x-boneblack-audio.dts%23L17-L28&sa=D&sntz=1&usg=AFQjCNHdxge1SQz3V8cG2II6UbZ9j0nDDw>
>
> Reboot, then install the audio: sudo sh -c "echo BB-BONE-AUDI-02 > 
> /sys/devices/platform/bone_capemgr/slots"
>
> All seems ok in dmesg:
> [  411.768801] bone_capemgr bone_capemgr: part_number 'BB-BONE-AUDI-02', 
> version 'N/A'
> [  411.768866] bone_capemgr bone_capemgr: slot #4: override
> [  411.774250] bone_capemgr bone_capemgr: Using override eeprom data at 
> slot 4
> [  411.774295] bone_capemgr bone_capemgr: slot #4: 'Override Board 
> Name,00A0,Override Manuf,BB-BONE-AUDI-02'
> [  411.811080] bone_capemgr bone_capemgr: slot #4: dtbo 
> 'BB-BONE-AUDI-02-00A0.dtbo' loaded; overlay id #0
>
> but speaker-test and aplay both fail with:
> [ 2632.788052] davinci-mcasp 48038000.mcasp: stream has more channels (2) 
> than are enabled in mcasp (0)
> [ 2632.788110] davinci-mcasp 48038000.mcasp: ASoC: can't set 
> 48038000.mcasp hw params: -22
>
>
> On Wednesday, July 19, 2017 at 12:21:09 PM UTC-4, engka...@gmail.com 
> wrote:
>>
>> This might be an old thread but I got a question. I was able to compile 
>> and load the modified device tree. I then loaded my overlay for the audio. 
>> I built this circuit base from 
>> http://elinux.org/CircuitCo:Audio_Cape_RevB. The only difference with 
>> mine is that I am using I2C1. I can see the it is using address 0x18 dmesg 
>> has:
>> [  135.176315] asoc-simple-card sound: tlv320aic3x-hifi <-> 
>> 48038000.mcasp mapping ok
>>
>> However, when I call on the speaker-test, this error appears: 
>>
>>
>> Unable to set hw params for playback: Invalid argument
>> Setting of hwparams failed: Invalid argument
>>
>> Checking dmesg:
>> [  617.051387] davinci-mcasp 48038000.mcasp: stream has more channels (2) 
>> than are enabled in mcasp (0)
>> [  617.051781] davinci-mcasp 48038000.mcasp: ASoC: can't set 
>> 48038000.mcasp hw params: -22
>>
>> Has anyone encountered the same problem?
>>
>>
>>
>>
>> On Monday, April 4, 2016 at 5:48:01 PM UTC+8, Rick M wrote:
>>>
>>> I'm trying to get my audio cape to work (which is nearly identical to 
>>> the cape that was available for sale). I've had it working to some level of 
>>> success with past kernels (3.1.18), but now I'm on 4.4.6. My existing DTS 
>>> didn't work, so I'm looking at how the BB-BONE-AUDI-02 DTS is written. 
>>>
>>> One of the differences is that it doesn't explicitly call out the McASP 
>>> clock frequency like the older one did. Instead, it seems to refer to 
>>> clk_mcasp0. But when I copy the same code into my DTS, I get: 
>>>
>>> [  103.180866] of_resolve_phandles: Could not find symbol 'clk_mcasp0' 
>>> [  103.187269] bone_capemgr bone_capemgr: slot #4: Failed to resolve 
>>> tree 
>>>
>>> I found it defined by grepping /boot/dtbs. It's in 
>>> /boot/dtbs/4.4.6-bone-rt-r6/am335x-abbbi.dtb. Where can I find the source 
>>> files for these DTBs? 
>>>
>>> Is this dtb part of what's loaded by default in 4.4.6-bone-rt-r6? If 
>>> not, can I copy the definition into my 
>>>
>>> FWIW, here's my DTS and some output from dmesg: 
>>> http://pastebin.com/niDkWdWV 
>>>
>>> Thanks, 
>>>
>>>
>>> -- 
>>> Rick Mann 
>>> rm...@latencyzero.com 
>>>
>>>
>>>

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