Re: [PATCH 1/3] gpiolib: Add ability to get GPIO pin direction

[Alan Cox]

> > If a GPIO driver implements get_direction(), it is called in
> > gpio_request() to set the initial direction of the pin accurately.
> 
> I see Grant was just added as a GPIO maintainer, so added him on CC.
> 
> Anything gating getting these 3 patches being picked up?

We need four states for a gpio pin direction though. A pin can be

- input
- output
- unknown (hardware lacks get functionality and it has not been set by
  software yet)
- alt_func (pin is in use for some other purpose)

(and being able to set them alt_func was proposed a while ago and I think
wants revisiting judging by the number of platforms which use gpio, and
in their own arch code are privately handling alt_func stuff)

Alan
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