[alsa-devel] multi-codec support for arizona-ldo1 was Re: System with multiple arizona (wm5102) codecs

[Charles Keepax]

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