The poe-hat [1] is an official hat from the raspberry foundation that:

> The Raspberry Pi PoE HAT powers a Raspberry Pi 4 Model B and Raspberry Pi 3 
> Model B+ via an Ethernet cable. Power-sourcing equipment is required on the 
> Ethernet network.

The hat is equipped with a fan that can adjust its speed based on the
temperature of the raspberry pi CPU.

Currently the hat fan doesn't work with openSUSE, it simply doesn't move.

I've reached out for help on the openSUSE-arm irc channel and this the sad
outcome of a brief investigation:

2020-09-10 16:18:52     nsaenz  guillaume_g, fcastelli: Sadly we don't have
upstream support for the poe hat. It depends on this driver:
https://github.com/raspberrypi/linux/blob/rpi-5.4.y/drivers/hwmon/rpi-poe-fan.c
which isn't available upstream. On the other hand there is a specfic DT overlay
available for that specific use case (rpi-poe.dtbo), but it's useless without
the actual driver.


Currently the hat fan works fine with raspbian and with ubuntu systems. It
would be great to include openSUSE to the list of the supported systems.



[1] https://www.raspberrypi.org/products/poe-hat/