Re: [PATCH 4/5 v3] mmc: add a function to get a regulator, supplying card's Vdd

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

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On Mon, May 28, 2012 at 11:12:18AM +0300, Adrian Hunter wrote:
> On 28/05/12 06:32, Philip Rakity wrote:

> > I have started looking at this area and I am rather confused.  It seems to me two "dedicated" regulators are required.

> It probably pays not to assume too much about regulators.  For example:

> Sometimes vccq is always on, so there may be just 1 regulator for vcc.

Even if the supply is always on you can easily provide an always on
regulator.  From the point of view of the consumer if there are two
physical supplies needed it's much clearer and easier to just code that
and deal with the fact that we might have no control over them
externally, there's nothing device specific about that process.

> wl12xx/SDIO is setup with a fake regulator that actually controls
> the enable line.

Which enable line is this?  If it's not for the regulator why wouldn't
other boards control this line?

> There is a case where power is supplied at a different voltage than
> spec'ed i.e. commit 6e8201f57c9359c9c5dc8f9805c15a4392492a10

The commit message there is really unclear so it's very hard to
understand what the commit is supposed to do...  for one thing it's not
entirely obvious what the connection with fixed voltage regulators is or
why there might be an intermittent issue.

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