MastinZgZ reacted to tparys in RS485 in NanoPi Neo Core
I've not tried this, but you might start looking at the 485 specific device tree bindings. If it's possible, you'll almost certainly need to write your own overlay.
Also, USB to 485 adapters are only around ~$15 USD on amazon. Unless you need to to use an onboard UART, or want to do it as a project, it may not be worth the time investment.