linux-kernel - Re: [PATCHv2] Input: omap4-keypad: Add pinctrl support

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Date:	Tue, 23 Oct 2012 13:11:56 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	balbi@...com, "Rafael J. Wysocki" <rjw@...k.pl>,
	Magnus Damm <damm@...nsource.se>,
	Paul Mundt <lethal@...ux-sh.org>,
	Benoit Cousson <b-cousson@...com>, tony@...mide.com,
	devicetree-discuss@...ts.ozlabs.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	Sourav Poddar <sourav.poddar@...com>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>
Subject: Re: [PATCHv2] Input: omap4-keypad: Add pinctrl support


On Tue, 23 Oct 2012 12:45:33 +0200, Linus Walleij wrote:

> Hm so I have had this idea of runtime PM core helping out
> with pins, so I could add something like
> 
> pm_pins_fetch()
> pm_pins_default()
> pm_pins_idle()
> pm_pins_sleep()
> 
> So if one is using the pin states defined in
> <linux/pinctrl/pinctrl-state.h> then the PM core can help out in
> keeping track of the pins and states, and the driver will just tell
> the PM core what to do and when.
> 
> Would this fit the bill for everyone's code consolidation needs?
> It would sure work for us...

That surely would work but is kind of non-obvious when reading a
driver's code: that's the problem with bus notifier, they do things a
bit "behind your back" without you noticing. Having the driver request
its own pinctrl state, and switch between states upon suspend/resume is
a lot more explicit, IMO.

Thomas
-- 
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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