[MinnowBoard] MinnowBoard MAX getting started with GPIO

[Martin Oldfield]

Thanks for the pointers.

I compiled a new kernel from the 3.18rc3 source and made some progress.

There are now gpio devices in /sys:

seabass mjo # ls /sys/class/gpio/
export       gpiochip338/ gpiochip382/ gpiochip410/ unexport     

And you can export things:
seabass mjo # echo 338 > /sys/class/gpio/export 
seabass mjo # ls /sys/class/gpio/
export       gpio338/     gpiochip338/ gpiochip382/ gpiochip410/ unexport     

But the GPIO numbers don't match the documentation:
seabass mjo # cat /sys/class/gpio/gpiochip*/base
338
382
410
seabass mjo # cat /sys/class/gpio/gpiochip*/ngpio
44
28
102

Is this to be expected ?

Cheers,
--
M.






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