linux-kernel - Re: [PATCH 2/4] regulator: add ab8500 per-regulator startup delay

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Message-ID: <AANLkTi=wv-HM3CVrfE-akwhpbV061LMKMQoxbsrRzRa6@mail.gmail.com>
Date:	Fri, 11 Mar 2011 12:08:45 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Linus Walleij <linus.walleij@...ricsson.com>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
	Bengt Jonsson <bengt.g.jonsson@...ricsson.com>
Subject: Re: [PATCH 2/4] regulator: add ab8500 per-regulator startup delay

On Thu, Mar 10, 2011 at 4:53 PM, Mark Brown
<broonie@...nsource.wolfsonmicro.com> wrote:
> On Thu, Mar 10, 2011 at 04:43:50PM +0100, Linus Walleij wrote:
>> as well. disable() may look superfluous but I bet there may be
>> cases where not having a voltage fully disabled before doing
>> something will cause immesurable harm.
>
> Given how heavily dependant collapsing the voltage is on the external
> circuitry I'm not sure the driver can say too much useful here.  Usually
> you're either going to collapse very quickly due to active discharge and
> load or you're heavily dependant on the board.

Hm! That's true. So if needed this should probably be a delay setting in
the rail in the struct regulation_constraints if it's really needed?

(I'll verify if it's need before implementing that.)

Linus Walleij
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