linux-kernel - Re: [PATCH 1/2] gpio: add pin biasing and drive mode to gpiolib

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Message-ID: <BANLkTimfkpjQ9DoYKRTVwyvtPRccO+RwpA@mail.gmail.com>
Date:	Wed, 20 Apr 2011 14:32:35 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ben Nizette <bn@...sdigital.com>, linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] gpio: add pin biasing and drive mode to gpiolib

2011/4/19 Kyungmin Park <kmpark@...radead.org>:

> One more consideration, not mentioned previous time, is that pin
> configuration for power down mode.
> Samsung SoCs has retention GPIO configurations at sleep (suspend)
> mode. and restore it at resume time.
> it's need to reduce power and proper operation after suspend.

Isn't this supposed to be handled by runtime_pm hooks inside
your GPIO driver rather than by someone else talking to
the GPIO driver trying to spool/unspool the state from the
outside in some other place?

Or am I getting things backwards now...?

Yours,
Linus Walleij
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