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

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Message-ID: <20121023122312.56b23e1c@skate>
Date:	Tue, 23 Oct 2012 12:23:12 +0200
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	balbi@...com
Cc:	Linus Walleij <linus.walleij@...aro.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
Subject: Re: [PATCHv2] Input: omap4-keypad: Add pinctrl support


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.

Best regards,

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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