linux-kernel - Re: [PATCH] regulator: Provide a check for dummy regulator

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Message-ID: <CAJe_ZhdzuHo8P5WHguKMaikht8aN4RU-j_Q9FB+xOSw=roFZ=w@mail.gmail.com>
Date:	Fri, 20 Apr 2012 23:55:22 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	linux-kernel@...r.kernel.org, lrg@...com
Subject: Re: [PATCH] regulator: Provide a check for dummy regulator

On 20 April 2012 20:12, Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:
>
>> > No.  You're failing to understand what dummy regulators are for.
>
>> I think I do understand what dummy regulators are for and also that
>> they are meant to go away some time in future.
>
> No, they're here to stay - people will always be bringing up new boards
> after all - but they're not supposed to be used on platforms.
>
"some time in future" means utopia.... whenever that be. The longer that is
to more important is it for dummy support to be 'complete'.

>
> In any case, as I've said it's not the fact that you've got a dummy
> supply that's an issue for most of the cases you mention - it's the fact
> that the supply is always on.
>
I am not sure anymore you read my posts :(
I am more bothered by the case where the supply is always off i.e,
physically absent.

> Even in the case where a supply might genuinely be missing (which are
> very unusual, it's more effort in silicon to cope with missing supplies)
>
It's not that unusual.  See vcc_aux at line 150 of omap_hsmmc.c

See how dummy fools the driver throughout into stuff like toggling vcc
even for platforms that don't really provide vcc_aux.
In practice, see how dummy affects (negatively because of unnecessary
toggles) the vcc too.  Not every platform with omap_hsmmc might afford
having dummy disabled (I don't know all to tell for sure).

Best Regards,
-Jassi
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