linux-kernel - Re: [PATCH v2] regulator: Add GPIO enable control to fixed voltage regulator driver

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Date:	Sat, 1 Aug 2009 08:57:43 +0300
From:	Roger Quadros <quadros.roger@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	pHilipp Zabel <philipp.zabel@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] regulator: Add GPIO enable control to fixed voltage 
	regulator driver

On Sat, Aug 1, 2009 at 12:44 AM, Mark
Brown<broonie@...nsource.wolfsonmicro.com> wrote:
> On Fri, Jul 31, 2009 at 11:32:32PM +0300, Roger Quadros wrote:
>
>> Not having gpio_get_direction() in gpiolib is a limitation I think.
>> Can we just do the following for now ? (i.e. disable regulator by default)
>> Will there be any glitch? If yes, then how?
>
> If you're going to do this then like I say you should make the default
> state controllable by platform data.  If we unconditionally disable the
> regulator then if, for example, the regulator is controlling the display
> backlight and it's on when Linux get controls then the user will see the
> backlight blink off then on during startup.
>

OK I will add another bit for this in fixed_voltage_config.

Do we need to check whether CONFIG_GPIOLIB is available? or do we need
to explicitly
select it in Kconfig?
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