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 14:11:42 +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 10:16:33PM +0100, Pavel Machek wrote:
> HiOn Sat 2015-11-14 18:49:40, Mark Brown wrote:
> > On Sat, Nov 14, 2015 at 06:59:16PM +0100, Pavel Machek wrote:
> > 
> > > Well, mfd_core.c seems to call regulator_bulk_register_supply_alias()
> > > with device that does not have dev_name initialized.
> > 
> > OK, that'll be the problem then - we're not mapping the supply into the
> > individual child device but rather system wide, probably because that
> > mapping is being done too early, before we've actually created the
> > device.
> 
> Take a look at mfd_add_device(). Yes, we do
> regulator_bulk_register_supply_alias() before doing
> platform_device_add().
> 
> > > regulator_bulk_register_supply_alias() results in "Adding alias"
> > > stuff, and then drivers/regulator/arizona-micsupp.c tries to register
> > > another "MICVDD".
> > 
> > That's fine because all supplies should be namespaced with a device.
> > The goal is to say "Supply X on device Y" (we do support exceptions for
> > the few cases where there are not yet any devices involved but this
> > clearly isn't one of them).

Indeed that should be the case.

> 
> Well, clearly someone should tell that to wm5102
> maintainers. Hmm. It looks like driver is marked supported but there
> are no names attached?
> 
> WOLFSON MICROELECTRONICS DRIVERS
> L:      patches@...nsource.wolfsonmicro.com
> T:      git git://opensource.wolfsonmicro.com/linux-2.6-asoc
> T:      git git://opensource.wolfsonmicro.com/linux-2.6-audioplus
> W:
> http://opensource.wolfsonmicro.com/content/linux-drivers-wolfson-device\
> s
> S:      Supported
> 
> I guess Charles Keepax should be listed there?

The patches mailing list functions as maintainer here. That way
anyone who works on upstream Linux stuff here will see the email
so you have more chance of someone replying. Also convient for
when people leave the company etc. makes for an easy transition.
I am afraid though that as in this case you are not always going
to get a reply over the weekend.

Thanks,
Charles
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