From mboxrd@z Thu Jan  1 00:00:00 1970
From: Felipe Balbi <balbi@ti.com>
Subject: Re: [RFC PATCH] gpio: add GPIO hogging mechanism
Date: Thu, 19 Dec 2013 10:47:37 -0600
Message-ID: <20131219164737.GA4536@saruman.home>
References: <1387463671-1164-1-git-send-email-b.brezillon@overkiz.com>
 <1387463671-1164-2-git-send-email-b.brezillon@overkiz.com>
 <20131219164109.GB27409@kroah.com>
Reply-To: <balbi@ti.com>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="pf9I7BMVVzbSWLtt"
Return-path: <linux-kernel-owner@vger.kernel.org>
Content-Disposition: inline
In-Reply-To: <20131219164109.GB27409@kroah.com>
Sender: linux-kernel-owner@vger.kernel.org
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Boris BREZILLON <b.brezillon@overkiz.com>, Rob Landley <rob@landley.net>, Linus Walleij <linus.walleij@linaro.org>, Alexandre Courbot <gnurou@gmail.com>, Jiri Prchal <jiri.prchal@aksignal.cz>, Ben Gamari <bgamari.foss@gmail.com>, Mark Rutland <mark.rutland@arm.com>, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, devicetree@vger.kernel.org
List-Id: linux-gpio@vger.kernel.org

--pf9I7BMVVzbSWLtt
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Thu, Dec 19, 2013 at 08:41:09AM -0800, Greg Kroah-Hartman wrote:
> On Thu, Dec 19, 2013 at 03:34:31PM +0100, Boris BREZILLON wrote:
> > GPIO hogging is a way to request and configure specific GPIO without
> > explicitly requesting it in the device driver.
> >=20
> > The request and configuration procedure is handled in the core device
> > driver code before the driver probe function is called.
> >=20
> > It allows specific GPIOs to be configured without any driver specific c=
ode.
> >=20
> > Particularly usefull when a external device is connected to a bus and t=
he
> > bus connections depends on an external switch controlled by a GPIO pin.

for external switches, you probably need a pinctrl-gpio driver.

--=20
balbi

--pf9I7BMVVzbSWLtt
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.15 (GNU/Linux)
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=7IMU
-----END PGP SIGNATURE-----

--pf9I7BMVVzbSWLtt--