linux-kernel - Re: multi-codec support for arizona-ldo1 was Re: System with multiple arizona (wm5102) codecs

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Date:	Mon, 16 Nov 2015 14:05:47 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Pavel Machek <pavel@....cz>
CC:	Mark Brown <broonie@...nel.org>, <sameo@...ux.intel.com>,
	<lee.jones@...aro.org>, <lgirdwood@...il.com>, <perex@...ex.cz>,
	<tiwai@...e.de>, <patches@...nsource.wolfsonmicro.com>,
	<alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: multi-codec support for arizona-ldo1 was Re: System with
 multiple arizona (wm5102) codecs

On Sat, Nov 14, 2015 at 06:59:16PM +0100, Pavel Machek wrote:
> Hi!
> 
> > If you're asking about the regulator API or embedded ALSA both of those
> > are me but there are other things in here - the driver you're working
> > with and the MFD core at least.  At the minute I'm not convinced that
> > the problem here isn't just that the MFD and/or MFD core hasn't set up
> > the mappings to the child devices properly.
> 
> Ok, good. I don't understand how the things are expected to fit
> together. See above. I believe SND_SOC_ macros should have another
> argument "device", or maybe regulator names should have "device" name
> embedded in them.

Effectively the device is passed it is just implicit. If you look
where the regulator is actually registered in soc-dapm.c

	case snd_soc_dapm_regulator_supply:
		w->regulator = devm_regulator_get(dapm->dev, w->name);
		if (IS_ERR(w->regulator)) {

You see we are requesting the regulator with the dapm device,
which will correspond to the CODEC.

Thanks,
Charles
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