I'd assume any driver source code, which the Linux world has produced a lot of, can serve as a source (pun intended) of documentation. There's also https://env

I'd assume any driver source code, which the Linux world has produced a lot of, can serve as a source (pun intended) of documentation. There's also https://envytools.readthedocs.io/en/latest/hw/intro.html https://envytools.readthedocs.io/en/latest/hw/intro.html