[alsa-devel] Wolfson 5102 on Beaglebone Black using ALSA

[Clark Dunson]

Thanks guys,

Cannot thank you enough.  We’ll probably go at it from both angles, schedule is very tight.  We’ve worked with both the 3.18 cirrus branch, and 4.4 main line, would be so awesome if we could figure a way to write to the wm5102 regmap from user land.  (Busybox i2cset is from the stone ages).

Will keep you posted on progress,

Clark

> On May 16, 2016, at 5:33 AM, Peter Ujfalusi <peter.ujfalusi at ti.com> wrote:
> 
> On 05/15/16 01:16, Clark Dunson wrote:
>> Hey everybody!
>> 
>> We have been working on integrating the Wolfson 5102 codec with the
>> Beaglebone Black.  We’ve made pretty decent progress, got the arizona code
>> in kernel 4.4 registering the wm5102 as ALSA sound card (both player and
>> recorder), have McAsp0 as 24.576 MHz clock source, and have 12 IRQs showing
>> up in /proc/interrupts.
>> 
>> We have been working with sound{compatible = "simple-audio-card”}, but now
>> have hit our first real question.  sysclk is hard coded to ‘0’ under
>> simple-audio-card, and we had to hack the kernel and change that to ‘1’ to
>> achieve ALSA sound card registration.  We’d all like for this work to
>> proceed without having to hack the kernel, and wondered if one of you might
>> recommend another approach or selection for device tree sound{compatible}
>> that might work out better?
> 
> For simple card you would need:
> http://mailman.alsa-project.org/pipermail/alsa-devel/2016-February/104316.html
> to be able to select the McASP clocks.
> 
> It is not going to apply on linux-next becasue of:
> http://mailman.alsa-project.org/pipermail/alsa-devel/2016-May/107783.html
> 
> but it is not should not be a big issue to resolve (one patch to move the
> clkid to binding header).
> 
> The davinci-mcasp driver will remain broken in this sense for a foreseen
> future as we need to convert the daVinci architecture to CCF first to be able
> to progress with the clock selection.
> 
> -- 
> Péter