Re: [PATCH 1/3] gpiolib: add gpio_set_direction()

[Mark Brown]

On 27 Feb 2010, at 16:24, David Brownell <david-b@xxxxxxxxxxx> wrote:

> On Saturday 27 February 2010, Mark Brown wrote:
> > >  "none" ... since it's not even a GPIO, why would it show
> > >       up through the GPIO subsystem???
> >
> > I suspect this is intended to be tristated, which might be useful  
> > to add.
>
> That's what "input" means, as a rule:  no output driver
> is active with a GPIO configured as "iput".  "Tristate"
> is an option that's relevant for outputs ... low, high,
> or not-driven.

Indeed, but some devices do implement a distinct tristate state for  
input mode pins (disabling interrupt generation logic and so on for  
example).
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