Re: [patch 2.6.29-rc3-git 1/2] regulator: twl4030 regulators
From: Liam Girdwood
Date: Thu Feb 26 2009 - 17:15:40 EST
On Sun, 2009-02-08 at 10:37 -0800, David Brownell wrote:
> From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
> Support most of the LDO regulators in the twl4030 family chips.
> In the case of LDOs supporting MMC/SD, the voltage controls are
> used; but in most other cases, the regulator framework is only
> used to enable/disable a supplies, conserving power when a given
> voltage rail is not needed.
> The drivers/mfd/twl4030-core.c code already sets up the various
> regulators according to board-specific configuration, and knows
> that some chips don't provide the full set of voltage rails.
> The omitted regulators are intended to be under hardware control,
> such as during the hardware-mediated system powerup, powerdown,
> and suspend states. Unless/until software hooks are known to
> be safe, they won't be exported here.
> These regulators implement the new get_status() operation, but
> can't realistically implement get_mode(); the status output is
> effectively the result of a vote, with the relevant hardware
> inputs not exposed.
> Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
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