Re: [RFC PATCH] gpio: add GPIO hogging mechanism

boris brezillon
2013-12-19T17:29:15Z

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