linux-kernel - Re: [PATCH 01/12] regulator: gpio-regulator: Demote GPIO Regulator driver to start later

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Date:	Thu, 13 Dec 2012 11:55:24 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, linus.walleij@...ricsson.com, ulf.hansson@...aro.org
Subject: Re: [PATCH 01/12] regulator: gpio-regulator: Demote GPIO Regulator
 driver to start later

On Mon, 10 Dec 2012, Mark Brown wrote:

> On Mon, Dec 10, 2012 at 02:28:36PM +0000, Lee Jones wrote:
> > On Mon, 10 Dec 2012, Mark Brown wrote:
> 
> > > This really isn't a good solution, especially not for a system that's DT
> > > based - on a DT system we can tell if there should be a GPIO present so
> > > we should be able to defer only when there's something that might
> > > provide the GPIO later on.
> 
> > Understood, but what's the solution for non-DT systems?
> 
> Provide a fixed regulator or something, perhaps we need a "definitely
> does not exist" regulator to help with this.  For every board you help
> with a sequencing bodge you're probably going to break another that
> needs different sequencing; for that matter it's not like GPIO
> controlled regulators are exclusively used for MMC, or that MMC
> exclusively uses GPIO - doing this for only one regulator is a bit of a
> red flag.

I understand your logic, hence why I wrote such a lengthy commit
message. However, I'm not sure I see a logical way around it. Asking
all users of MMCI to provide a not-regulator to declare that a
secondary regulator isn't available seems a little unreasonable to me.

Is there anything else we can do?

-- 
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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