[OpenWrt-Devel] [PATCH v4 1/2] serial: ar933x_uart: add rs485 support

Karl Palsson karlp at tweak.net.au
Wed Feb 12 07:55:37 EST 2020

Petr  Štetiar  <ynezz at true.cz> wrote:

> I really dont get this part and BTW it possibly breaks
> `rs485-rx-during-tx` DTS binding.

Just as an aside, that's not a required binding, and not used all
that often either. Not all hardware even supports this, even if
you make sure the driver handles it well. The transceivers
normally have separate pins for driver enable and (not) receiver
enable, but they're (very) often wired together, so you _can't_
rx during tx. If your hardware does offer it, it can be used to
do collision detection, but it's definitely an optional binding.
I'd _MUCH_ rather see the basic bindings working _at all_ rather
than asking for this optional one.

Karl Palsson
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