linux-kernel - Re: [PATCH 1/1] mmc: core: Use regulator_get

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Message-ID: <CAD7vxxKTk2Na9B4ae6EGT8HaKDRp0iu4zX1tB8DPtmePKbHrLw@mail.gmail.com>
Date:	Sun, 17 Aug 2014 10:11:30 -0700
From:	Tim Kryger <tim.kryger@...il.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Chris Ball <chris@...ntf.net>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Haijun Zhang <Haijun.Zhang@...escale.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Yuvaraj Kumar C D <yuvaraj.cd@...il.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] mmc: core: Use regulator_get_voltage() if OCR mask is empty.

On Fri, Aug 15, 2014 at 3:29 PM, Mark Brown <broonie@...nel.org> wrote:
> On Fri, Aug 15, 2014 at 07:19:41AM -0700, Tim Kryger wrote:
>
>> That is a little different from my suggestion where the constraints
>> check is skipped when the regulator output is fixed.  It effectively
>> does this now when the regulator itself provides the fixed voltage.
>> However, the checks aren't skipped when that fixed voltage is coming
>> from an ancestor.  Why the difference?
>
> Nobody has written suitable code, and please bear in mind that even if
> the code is written there will probably be cases where it's too
> expensive for whatever reason so Javier's change is going to be needed.

I fail to see how replicating similar logic at all current
regulator_list_voltage call sites would be any more efficient than
handling this directly in regulator core.
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