DT GPIO numbering?

Linus Walleij linus.walleij at linaro.org
Tue Aug 14 20:00:23 EST 2012


On Fri, Aug 10, 2012 at 11:34 AM, Johannes Stezenbach <js at sig21.net> wrote:

> Actually I think the kernel internal GPIO numbers shouldn't be in the
> sysfs API, instead userspace should use the names.

This is true, but we cannot remove these numbers because they
are now in Documentation/ABI/testing/sysfs-gpio

And while the "testing" ABI is, well for testing, it would probably
break a lot of stuff it we removed it.

But we can sure add names. However these would still sit under
/sys/class/gpio/gpioN/name

Or do you suggest we simply duplicate all GPIOs which have
names under /sys/class/gpio/named/<name>
or something like that?

I know Grant may have opinions on this...

>  Probably it's
> best to not use /sys/class/gpio/export but instead let the board
> init code export the GPIOs available to userspace with proper names.

This sounds true.

Yours,
Linus Walleij


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