Changelog of features / drivers removed from kernel?

Apologies if this comes off as a lazy question, but after a fair bit of
searching I've been unable to find a changelog indicating which device
drivers / features were dropped from various versions of the kernel. Does
such a changelog exist?

I'm specifically trying to narrow down why the PCI devices on a server I
have work with 5.8 and don't work with 5.9+. The server is circa 2014, so I
suppose there's an off chance support for some component got dropped.

Thanks in advance,
Evan

-- 
Evan Mesterhazy
etm2131@columbia.edu