gpio after kernel 3.8

[zamek z]

Hi All, 

I would like to use userspace gpio in my pandaboard. Before 3.8 it was very simple, 

echo <gpio_number> > /sys/class/gpio/export 

it made the gpio<gpio_number> directory and I entered the directory and I could set direction and level with simple echo commands. 

After Kernel 3.8 there was a new gpio system, named pinctrl. 

In a 3.12 kernel I can export the wanted gpio to /sys/cass/gpio, and it creates the directory and virtually everything is works. But at the expansion header I cannot detect anything. 

Maybe I need to set mux setting. Could somebody help me how can I use for example gpio39 or any gpio pin in j3? 

thx

Zamek