linux-kernel - Re: [PATCH] mmc: move regulator handling to core

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Date:	Fri, 4 Dec 2009 12:58:05 +0100
From:	Daniel Mack <daniel@...aq.de>
To:	Adrian Hunter <adrian.hunter@...ia.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Pierre Ossman <pierre@...man.eu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Fleming <matt@...sole-pimps.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Eric Miao <eric.y.miao@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Cliff Brake <cbrake@...-systems.com>,
	"Lavinen Jarkko (Nokia-D/Helsinki)" <jarkko.lavinen@...ia.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"madhu.cr@...com >> Madhusudhan Chikkature" <madhu.cr@...com>
Subject: Re: [PATCH] mmc: move regulator handling to core

On Thu, Dec 03, 2009 at 10:12:36PM +0200, Adrian Hunter wrote:
> Daniel Mack wrote:
> >On Thu, Dec 03, 2009 at 04:27:39PM +0200, Adrian Hunter wrote:

> >>What about arch/arm/mach-omap2/mmc-twl4030.c ?
> >
> >Argh, missed that one. And this particular case doesn't fit to my
> >modifications. I don't know the code well ...  We would need to
> >have a struct mmc_host * in all the functions there calling
> >mmc_regulator_{set,get}_ocr. Any idea how to resolve that?
> >
> 
> Pass it down from the omap_hsmmc driver.

It's not that easy, unfortunately, because this code does not conform to
all the other mmc host drivers in tree.

I don't understand why things are done the way it is currently
implemented. Why isn't there a mmc_host for each slot, and why is a
regulator reference acquired for each slot, and not once for the whole
device?

Even with the default 'vcc' supply factored out to the mmc core, the
'vmmc_aux' regulator would still need some extra attention, but I would
also do that from the omap_hsmmc driver rather than in the plaform
support code.

Moving the regulator handling to the mmc core would require a major
cleanup to all this code, but I don't have such hardware to test my
modifications. Can anyone help here?

Thanks,
Daniel

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