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

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Message-ID: <20121023104256.GB24820@arwen.pp.htv.fi>
Date:	Tue, 23 Oct 2012 13:42:56 +0300
From:	Felipe Balbi <balbi@...com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	<balbi@...com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.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

Hi,

On Tue, Oct 23, 2012 at 12:45:33PM +0200, Linus Walleij wrote:
> On Tue, Oct 23, 2012 at 12:29 PM, Felipe Balbi <balbi@...com> wrote:
> > On Tue, Oct 23, 2012 at 12:29:28PM +0200, Linus Walleij wrote:
> 
> >> So the biggest implementation of the notifier approach to resource
> >> handling is the SH clock thing:
> >> drivers/base/power/clock_ops.c
> >
> > that's different right ? It's just creating the list of clocks, device
> > drivers still have to call pm_clk_add().
> >
> > That's ok, I guess, otherwise all struct device would allocate memory
> > which hardly ever used (so far).
> 
> 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...
> 
> It however require that no custom states are used and that we
> keep to the state semantics I just happen to think is most
> common.

From a quick read, it looks ok. I guess problems will only how up when
we actually end up with a silicon errata or something similar which
mandates that we change pin's state at a particular location. Not sure
if we have those yet.

-- 
balbi

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