Hello,

Some other platforms expose gpio ports via sysfs drivers, something like
/sys/devices/platform/gpio
/sys/class/gpio

Do such things exist for at91 or this is something yet to be written?

Using /sys/class/gpio here.

Is it available somewhere?

There is another post that might describe what you want a little more: http://www.at91.com/samphpbb/viewtopic.php?f=12&t=20065

A quick Google gets this
http://www.armbedded.eu/node/258

Pretty sure buildroot pulls it in by default.

Thanks for this link.



Thanks for this link.
Unfortunately prebuilt kernel does not have gpio driver.
Although, when I build the kernel preconfigured for my board (Electrum-100) I see gpio.o among object files.
Interestingly, at what step it is slipped away from the kernel?
Do you think if it would be possible to build gpio as a module?

I appreciate your help on this matter.