More GPIO madness on iMX6 - and the crappy ARM port of Linux

[Stephen Warren]

On 01/17/2014 11:47 AM, Russell King - ARM Linux wrote:
> So, we have this wonderful GPIO layer which abstracts GPIO stuff and
> hides stuff.  It's really wonderful, because you don't have to care
> about how the GPIOs are actually accessed in drivers anymore.
...
> 1. What should gpio_get_value() return for an output?

Some HW can't ever read back the value of an output pin, so isn't
calling gpio_get_value() undefined for output pins?

> 2. What should be reported in /sys/kernel/debug/gpio for an output?

Shouldn't it indicate that the pin is an output, and say nothing about
the input value?