linux-kernel - Re: [RFC PATCH] gpio: add GPIO hogging mechanism

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Date:	Thu, 19 Dec 2013 18:18:40 +0100
From:	boris brezillon <b.brezillon@...rkiz.com>
To:	balbi@...com, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Rob Landley <rob@...dley.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Jiri Prchal <jiri.prchal@...ignal.cz>,
	Ben Gamari <bgamari.foss@...il.com>,
	Mark Rutland <mark.rutland@....com>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [RFC PATCH] gpio: add GPIO hogging mechanism

Hello Felipe,

On 19/12/2013 17:47, Felipe Balbi wrote:
> 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.
>>>
>>> The request and configuration procedure is handled in the core device
>>> driver code before the driver probe function is called.
>>>
>>> It allows specific GPIOs to be configured without any driver specific code.
>>>
>>> Particularly usefull when a external device is connected to a bus and the
>>> bus connections depends on an external switch controlled by a GPIO pin.
> for external switches, you probably need a pinctrl-gpio driver.
>
Do you mean using pinctrl pinconf to configure the PIN as output-high or
output-low ?

This was my first proposal
(see https://www.mail-archive.com/devicetree@vger.kernel.org/msg05829.html).


Best Regards,

Boris
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