linux-kernel - Re: [PATCH] Documentation about RS485 serial communications

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Date:	Tue, 16 Nov 2010 20:04:26 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Grant Edwards <grant.b.edwards@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] Documentation about RS485 serial communications

> Comtrol, Moxa, B&B, Sealevel, and others all sell PCI cards and
> Ethernet attached serial ports that have selectable interfaces
> (typically RS-232/422/485).  Comtrol and Moxa have had drivers in the
> kernel tree for ages, but they've always had to use custom ioctl calls
> for things like configuring 232/485/422 mode and half/full-duplex
> mode.

Ok so what is needed that isn't covered by the current termiox and
TIOCG/SRS485 ioctls ?

> Having a standard API for things like interface mode, half-full
> duplex, inter-character timeout, 9-bit mode, and so on would be life a
> lot easier for those of us who maintain Linux serial drivers...

9bit mode is a real problem with the tty layer defined in terms of 8bit
streams but yes.
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