Petalinux gpio

[kmbm]

Hi, 

I have a problem with my PS GPIO. I've routed them throught EMIO to PMOD and I would like to use it with petalinux. 

In /sys/class/gpio I have: export gpiochip906 unexport. I tried to change value of one of the 906-908 gpio but nothing change on PMOD. Also when I cat ./gpio908/value I always have 0.

Here is my dts struct:

&gpio0{
    emio-gpio-width = <3>;
    gpio-mask-high = <0x0>;
    gpio-mask-low = <0x5600>;
};

Where can be a reason of this problem

[hxiaoqiang]

hi @kmbm,

   what version petalinux are you use？

   take a look at http://www.wiki.xilinx.com/Linux+GPIO+Driver 。

   have you export the gpio’s direction?

[kmbm]

I use petalinux 2016.2.

Yes I set direction. Here Is what i did

export 906 > export
cd gpio906
echo out > direction
echo 1 > value

The link which you included  doesn't help

[hxiaoqiang]

try delete the dts you added.

&gpio0{
    emio-gpio-width = <3>;
    gpio-mask-high = <0x0>;
    gpio-mask-low = <0x5600>;
};

[hxiaoqiang]

have you set emio‘s  constraint？ just like this:

set_property PACKAGE_PIN W15 [get_ports {gpio_0_tri_io[0]}]
set_property PACKAGE_PIN W16 [get_ports {gpio_0_tri_io[1]}]