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: Author: allanjude Date: Sat Jul 11 20:56:58 UTC 2020 New revision: 363111 URL: https://svnweb.freebsd.org/changeset/base/363111 Log: Add cross references betwen ttys(5) and related drivers nmdm(4), ucom(4), and uart(4) PR: 247638 Submitted by: Pau Amma <pauamma@gundo.com> Reported by: 0mp MFC after: 4 weeks Sponsored by: Klara Inc. Event: July 2020 Bugathon Changes: head/libexec/getty/ttys.5 head/share/man/man4/nmdm.4 head/share/man/man4/uart.4 head/share/man/man4/ucom.4