linux-kernel - Re: [PATCH] regulator: read low power states configuration from device tree

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Message-ID: <2074197.ld4vucf8Ke@flatron>
Date:	Fri, 26 Jul 2013 22:54:10 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Vincent Palatin <vpalatin@...omium.org>,
	Grant Likely <grant.likely@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-kernel@...r.kernel.org, Olof Johansson <olofj@...omium.org>,
	devicetree@...r.kernel.org
Subject: Re: [PATCH] regulator: read low power states configuration from device tree

On Thursday 25 of July 2013 21:03:43 Mark Brown wrote:
> On Thu, Jul 25, 2013 at 12:42:00PM -0700, Vincent Palatin wrote:
> > +- regulator-suspend-disk-microvolt: voltage applied when entering S2D
> > +- regulator-suspend-disk-disabled: turn off when entering S2D
> > +- regulator-suspend-mem-microvolt: voltage applied when entering S2M
> > +- regulator-suspend-mem-disabled: turn off when entering S2M
> > +- regulator-suspend-standby-microvolt: voltage applied when entering
> > standby +- regulator-suspend-standby-disabled: turn off when entering
> > standby
> The reason this isn't in device tree at the minute is that suspend to
> disk and suspend to RAM are somewhat Linux specific concepts and the
> whole thing gets more and more dynamic as time moves forwards with the
> suspend state for practical systems depending on the instantaneous
> device state prior to entering suspend and the bits that are fixed often
> involving sequencing elements and so on which get fixed in hardware
> and/or bootloader.  Do you have practical systems where this is needed?

We do have such boards at Samsung. Actually I made a similar patch for our 
internal tree.

> It's also not clear to me hat the -disabled properties make sense; if we
> have properties for the state when enabled I'd expect them to allow
> things to be marked as enabled or disabled (with don't touch as the
> default).

+1

Best regards,
Tomasz

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