Messages in this thread | | | Date | Mon, 14 Feb 2011 17:08:12 +0000 | From | Alan Cox <> | Subject | Re: [PATCH 1/3] gpiolib: Add ability to get GPIO pin direction |
| |
> > 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
| |