linux-kernel - Re: [PATCH v1] 8250: add support for DTR/DSR hardware flow control

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Message-ID: <20080807101448.239fadc6@lxorguk.ukuu.org.uk>
Date:	Thu, 7 Aug 2008 10:14:48 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Laurent Pinchart <laurentp@...-semaphore.com>
Cc:	Aristeu Rozanski <arozansk@...hat.com>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] 8250: add support for DTR/DSR hardware flow control

> Please read the '[PATCH/RFC] 8250: Auto RS485 direction control' thread for background information. In a nutshell we need more than just CTS/RTS and DTR/DSR, and we don't have enough c_cflags bits. We will probably have to create a new ioctl.

Maybe - fortunately the kernel and user termios structure are now
independent so we can extend ktermios easily enough.

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