[fedora-arm] Re: Nvidia Jetson Nano GPIO?

On Tue, Mar 30, 2021 at 12:31 PM Richard Shaw <hobbes1069@gmail.com> wrote:
>
> I have a Jetso Nano running Fedora 33 following this guide:

Which guide, could you provide a link?

> I want to use it to play with home automation and I have node-red installed and have hacked together a node based on the Rpi GPIO node for the Jetson.
>
> I have copied the udev rules into /etc/udev/rules.d but I don't see the devices, there is no /sys/class/gpio. I changed the udev loglevel to info and see:

<snip> please only include relevant logs.

We don't support the gpio sysfs means of accessing GPIO, it's been
deprecated since around the 4.8 kernel.

> Any tips? Or am I stuck running Nvidia's linux for it to work?

The replacement mechanism is the GPIO character interface where the
GPIO is available via /dev/gpiochip* or through the libgpiod userspace
utils and python3 bindings in the python3-libgpiod package. I've not
looked but I would guess there's support for this interface on NodeRED
as it's been around for some time.

Peter
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