linux-kernel - Re: [PATCH] regulator: Fix machine constraints apply for min_uV != max

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Message-ID: <20100903145420.GB7614@rakim.wolfsonmicro.main>
Date:	Fri, 3 Sep 2010 15:54:20 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Jarkko Nikula <jhnikula@...il.com>
Cc:	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [PATCH] regulator: Fix machine constraints apply for min_uV !=
 max_uV

On Fri, Sep 03, 2010 at 04:43:49PM +0300, Jarkko Nikula wrote:
> Constraints are not applied until both min_uV and max_uV are the same. This
> looks like a typo in the test.
> 
> Signed-off-by: Jarkko Nikula <jhnikula@...il.com>

This is deliberate behaviour, apply_uV can only be used with a fixed
voltage at startup in order to avoid issues with handover from the
bootloader if we suddenly drop the supply voltage on a device which has
not yet been claimed by a driver.  The expectation is that if the
voltage can vary then something that understands the hardware state
needs to be involved in maintaining the voltage.
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