linux-kernel - Re: [PATCH 1/5] regulator: core: Resolve supply earlier

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Message-ID: <20160411135621.GF3351@sirena.org.uk>
Date:	Mon, 11 Apr 2016 14:56:21 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Jon Hunter <jonathanh@...dia.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org,
	Javier Martinez Canillas <javier@....samsung.com>
Subject: Re: [PATCH 1/5] regulator: core: Resolve supply earlier

On Mon, Apr 11, 2016 at 03:09:14PM +0200, Thierry Reding wrote:
> On Mon, Apr 11, 2016 at 01:58:14PM +0100, Mark Brown wrote:

> > That then takes us right the way back to the original problem where
> > people we're getting upset at the number of probe deferrals they were
> > seeing and more importantly we didn't have any way of sorting out
> > dependencies within a single PMIC if the parents weren't registered
> > before their children.

> Isn't that usually solved by making each regulator of a PMIC a separate
> device (platform device, typically, for MFD devices? That way each of
> them is probed separately allowing the dependency cycle to be broken.

That's not something we've actually done and it's going to be an
enormous pain for driver authors without helpers to make the devices,
IIRC some systems are depending on this happening at the minute.  I can
also see the complaints starting to flood in about kicking off more
deferred probes.

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