Does anyone have any insight into lan78xx usb driver support for the Raspberry Pi?

 

I am attempting to use a Microchip PoE USB-C device to enabling networking to a Raspberry Pi4B. The work is part of a RoadTest for Microchip PoE to USB-C® Power and Data Adapter .

 

A quick check with a command line lsmod shows no lan78xx driver. There is no /lib/modules/5.10.17-v7l+/kernel/net/usb to support the lan78xx as suggested in some posts I have found.

 

I did find this post https://wiki.seeedstudio.com/Dual-Gigabit-Ethernet-Carrier-Board-for-Raspberry-Pi-CM4/   and successfully completed the procedure for an Ethernet Port configuration.

 

A lan7800 module reference does appear for a command line lsmod after the install. The Microchip PoE USB-C lan7800 port is not detected when connected to the Pi. Still no reference to a lan78xx module appears in the directory structure.

 

The vendors site https://www.microchip.com/wwwproducts/en/LAN7800  indicates there has been support in the Linux kernel. My searches for Pi driver support has been limited. My understanding is lan78xx is a modules in the usb subdirectory when installed. I'm not seeing that for this kludge.

 

I'm thinking maybe I need a a dtsoverlay in the config.txt directory. Really not sure. I have gone as far as to load Ubuntu for the Pi to see if it is O/S related. That didn't prove fruitful.

 

I welcome any insight community members may have regarding network driver installs for the Pi. I will continue to hunt and peck to see if there is anything I have missed.