Re: [PATCH/RFC] serial: Add ioctl to enable auto rs485 mode with some Exar UARTs

[Matthias Fuchs <mfuchs@ma-fu.de>]

Hi Christopher,

I checked all your referenced threads. Here is my summary:

1) RS485 seems to be an issue for several people.
2) enabling hardware RS485 via ioct is never totally dismissed.
3) Discussion about software direction control will never end.

So I suggest not to mix hardware and software direction control
as the same issue. When the hardware supports direction control
we should implement it as ioctl. 

Even this sounds a little bit egoistic, it might bring us a little forward.

I will update my initial patch and consider Laurent's comments.

Matthias

> Recent discussions on RS485 auto direction control seem to be split over
> a number of threads.
> 
> Here are the threads that I'm aware of:
> http://marc.info/?t=121805745200001&r=1&w=2
> http://marc.info/?t=121690034200007&r=1&w=2
> http://marc.info/?t=122821576400003&r=1&w=2
> http://marc.info/?t=122822457300004&r=1&w=2
> http://marc.info/?t=122954923400001&r=1&w=2
> http://marc.info/?t=122964426200001&r=1&w=2
> http://marc.info/?t=121566595900001&r=1&w=2
> http://marc.info/?t=121805198200004&r=1&w=2
>