i have windriver ported linux with ls1020a chip. But in our side, it seemed that the gpio is not working.
After kernel boot, we can only see:
root@localhost:~# ls /sys/class/gpio/
And it seemed that there is no any gpio exported. What it should be?
And i am also not sure what kernel log should be when kernel enable gpio?
I need to use gpio2_14 to control external device but so far not able to export to user space and control with set/get value.
Please also help point to me what gpio source file i should look at in linux kernel. If you can, please let me know the working kernel source code and device tree then i can compare with the kernel & device tree i had in my side.
thanks a lot and it really affects our project seriously.