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

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Message-ID: <20121023102903.GA24820@arwen.pp.htv.fi>
Date:	Tue, 23 Oct 2012 13:29:03 +0300
From:	Felipe Balbi <balbi@...com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Magnus Damm <damm@...nsource.se>,
	Paul Mundt <lethal@...ux-sh.org>, <balbi@...com>,
	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>
Subject: Re: [PATCHv2] Input: omap4-keypad: Add pinctrl support

Hi,

On Tue, Oct 23, 2012 at 12:29:28PM +0200, Linus Walleij wrote:
> On Tue, Oct 23, 2012 at 12:23 PM, Thomas Petazzoni
> <thomas.petazzoni@...e-electrons.com> wrote:
> >
> > On Tue, 23 Oct 2012 13:03:33 +0300, Felipe Balbi wrote:
> >
> >> > But it appears that shmobile prefer to get all resources using
> >> > bus notifiers.
> >> >
> >> > So we need to form some kind of consensus ... or live with
> >> > the fact that different systems do it different ways. Which will
> >> > explode the day we need to use a driver on two systems,
> >> > each using the other approach :-)
> >>
> >> I much prefer having drivers explicitly manage all their resources,
> >> which would mean that pinctrl calls need to be done on probe() and, if
> >> necessary, during suspend()/resume().
> >>
> >> Using bus notifiers for that is quite a hack IMHO.
> >
> > Agreed. Just like drivers do their ioremap, request_irq and others,
> > they should also request their pin resources using the pinctrl API.
> > Hiding this behind a bus notifier is not nice.
> 
> 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).

-- 
balbi

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