Date: Tue, 16 Nov 2010 20:04:26 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Grant Edwards <grant.b.edwards@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] Documentation about RS485 serial communications
Message-ID: <20101116200426.75085b68@lxorguk.ukuu.org.uk>
In-Reply-To: <ibuh1v$uh6$1@dough.gmane.org>
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> 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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