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Odroid C2 GPIO failure

mboehmer
in Amlogic meson

Featured Replies

Hi,

 

maybe someone can give me a hint... I have a running system now on 128GB eMMC card, and wanto to use GPIO.

I have /sys/class/gpio/ with export, and unexport files, and two gpiochip0 and gpiochip14 entries.

Unfortunately I can't export pins, as 

export 231 > /sys/class/gpio/export

gives me a (as user and root) 

bash: echo: write error: Invalid argument

Any help is appreciated.

 

EDIT: works now. It is somehow a bit complicated, as the "usual" numbers as known from 3.x kernels vanished. Debug output shows two "gpiochips", with a certain number of pins, which you have to correlate to the device tree enums for that "chips" - giving you finally the number you want.

Maybe I simply don't get the simplicity of that new concept...

 

So far, Michael

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