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

[boris brezillon]

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@xxxxxxxxxxxxxxx/msg05829.html).


Best Regards,

Boris
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/