linux-kernel - Re: System with multiple arizona (wm5102) codecs

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Date:	Mon, 14 Sep 2015 14:31:29 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Pavel Machek <pavel@....cz>
CC:	<lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
	<tiwai@...e.de>, <patches@...nsource.wolfsonmicro.com>,
	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: System with multiple arizona (wm5102) codecs

On Mon, Sep 14, 2015 at 12:52:55PM +0100, Charles Keepax wrote:
> On Mon, Sep 14, 2015 at 01:54:39PM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > I've got an embedded system with two arizona / wm5102 codecs.
> > 
> > Unfortunately, kernel does not seem to be ready for that
> > configuration.
> > 
> > In particular, drivers/regulator/arizona-ldo1.c and
> > drivers/regulator/arizona-micsupp.c register system-wide "MICVDD" and
> > "LDO1" regulators, but with two codecs in the system, we really have
> > wm5102-codec.1.MICVDD, wm5102-codec.2.MICVDD, wm5102-codec.1.LDO1 and
> > wm5102-codec.2.LDO1.
> > 
> > That got me second codec working in two-codec configuration, but first
> > one still stops working as soon as two codecs are enabled.
> > 
> > If you have idea what else needs fixing, let me know.
> > 
> > Best regards,
> > 								Pavel
> 
> 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.

Oh and one more all the calls to mfd_add_devices in
arizona-core.c use PLATFORM_DEVID_NONE at the moment, which I
suspect will also cause problems at some point.

Thanks,
Charles
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