udev How do I add name and serial properties/attributes to an existing driver

ADorchak

I'm trying to set up persistent device id's on my custom gpio ports. But udevadm info -a produces no unique identifiers for my ports. I had hoped that I could just add a reg-name or serial-number field in my device tree and it would proliferate through to /sys. Then I could create a rule and symbolic link in the typical way. That doesn't seem to be the case. Is there an of_ call that I need to include in the device driver to pick up my node entries from my device tree? Or am I just totally confused. Thanks in advance. I don't mind doing some work if there's a simple "go read this answer". But so far I'm totally confused about the back end part of this.

luisviveropena

Hi @ADorchak,

But udevadm info -a produces no unique identifiers for my ports

What do you mean with that? What udevadm info --name=/dev/ --attribute-walk
is giving you?

I found this document about "Assign fixed USB port names to your Raspberry Pi":

https://www.freva.com/assign-fixed-usb-port-names-to-your-raspberry-pi/

I don't have any gpio ports here and I haven't worked with them, so I don't see how to make a test case.

Regards,
Luis.

lee42x

Please note this is outside of the target for this forum, but here are a couple of links you may find interesting.

Regards Lee

How about this link: https://wiki.gentoo.org/wiki/Raspberry_Pi_Serial_Ports#Create_Udev_Rules
or:
https://raspberrypi.com/documentation/computers/configuration.html#configuring-uarts

ADorchak

Thanks guys for the pointers and sorry if this is not an appropriate topic for the forum. I'll hop on one of the links you shared if this information doesn't help.

luisviveropena

Hi @ADorchak, it's a pleasure!

Regards,
Luis.