linux-kernel - Re: [alsa-devel] System with multiple arizona (wm5102) codecs

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Date:	Tue, 15 Sep 2015 06:56:39 -0700
From:	Caleb Crome <caleb@...me.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	tiwai@...e.de, linux-kernel@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com, lgirdwood@...il.com,
	broonie@...nel.org
Subject: Re: [alsa-devel] System with multiple arizona (wm5102) codecs

Hi Pavel,
   I'd love to see the patches :-)  I've been trying to figure out the
*right* way to add multiple codecs to a single card (and single CPU
DAI) for some days now.  Any help would be greatly appreciated.

Thanks,
 -Caleb

On Tue, Sep 15, 2015 at 1:35 AM, Pavel Machek <pavel@....cz> wrote:
> Hi!
>
>> > > I must confess I haven't ever tested a system with two Arizona
>> > > CODECs connected. Yes it seems you would get clashes on the
>> > > regulator names, I guess that would need to be fixed up. If you
>> > > were doing so wm831x-ldo.c would probably make a reasonable
>> > > example.
>> > >
>> > > I guess you would need to be careful with the machine driver as
>> > > well, you will need to use a snd_soc_codec_conf structure for at
>> > > least one (although I would do both) of the CODECs to give  a
>> > > prefix for all the widget/control names, otherwise those will
>> > > clash and everything will probably behave very strangely. See
>> > > sound/soc/samsung/bells.c for an example doing this for wm9081.
>> > >
>> > > Those are the only two things that spring to mind at the moment
>> > > but keep me informed on how you are getting on and I will let you
>> > > know if I can come up with any other traps.
>> >
>> > It seems that davinci-evm takes data from device tree, but then uses
>> > statically-allocated evm_soc_card, which would lead to problems in
>> > dual-codec config....?
>>
>> That somewhat depends on how you plan on doing things. I had
>> assumed you would be having a single machine driver with both
>> CODECs connected to it, in which case the statically allocated
>> snd_soc_card wouldn't be a problem. However, if you wanted to
>> have two seperate machine drivers with a single CODEC connected
>> to each then you would have an issue.
>>
>> I guess either approach is reasonable and probably just depends
>> on what your end goal is.
>
> The way dts is set up in my case, I ended up with two
> snd_soc_cards. It seems to work for me now (on old kernel and with
> some rather extreme hacks).
>
> I'll most likely clean it up and get into mainline-ready form, but it
> will take some time. If you want to see the ugly patches, let me know.
>
> Thanks and best regards,
>                                                                         Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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