What are the applicable devices in addition to uarts(4)? Grepping /usr/src/share/man/man4 for tty and removing what I think are false positives finds ucom(4) and nmdm(4), but I may have missed some.
Probably cu(1) would be useful to mention
Created attachment 216397 [details]
Add crossrefs between ttys(5), nmdm(4), ucom(4), and uart(4)
A commit references this bug:
Date: Sat Jul 11 20:56:58 UTC 2020
New revision: 363111
Add cross references betwen ttys(5) and related drivers
nmdm(4), ucom(4), and uart(4)
Submitted by: Pau Amma <firstname.lastname@example.org>
Reported by: 0mp
MFC after: 4 weeks
Sponsored by: Klara Inc.
Event: July 2020 Bugathon