Re: [PATCH v2] gpio: add userspace ABI for GPIO line information

[Michael Welling <mwelling@xxxxxxxx>]

On Fri, Feb 19, 2016 at 09:55:41AM +0100, Linus Walleij wrote:
> On Wed, Feb 17, 2016 at 9:54 PM, Michael Welling <mwelling@xxxxxxxx> wrote:
> 
> > After applying the patch from Josh Cartwright:
> > http://www.spinics.net/lists/arm-kernel/msg484070.html
> 
> Sorry for screwing up :(
> 
> > root@dragonboard-410c:/sys/class/gpio# ~/lsgpio
> > GPIO chip: gpiochip0, "1000000.pinctrl", 122 GPIO lines
> >         line 0: unnamed unlabeled
> > (...)
> >
> > Tested-by: Michael Welling <mwelling@xxxxxxxx>
> 
> I hope that means you also like where this is going :D
>

I am very happy to see the progress that is being made.

I am looking forward to see how the GPIOs will be modified from userspace.
The fact that single controllers can host hundreds of GPIOs is going to
make it an interesting problem.

Do you have a sketch of how the accesses with be performed?
ioctl, read, write.

Thanks for all of the work so far.
> I merged this to my main branch now.
> 
> Yours,
> Linus Walleij
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