I have the same issue.
I am running kernel debian with kernel 4.4.52-bone16
I pulled down RobertCNelson's dtb-rebuilder from 
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 

Reboot, then install the audio: sudo sh -c "echo BB-BONE-AUDI-02 > 

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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