linux-kernel - Re: [PATCH] serial: 8250: Make ISA ports optional

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Date:	Thu, 8 Jan 2015 22:36:26 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Tony Lindgren <tony@...mide.com>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH] serial: 8250: Make ISA ports optional

> One idea that has come up in the past but never saw an implementation
> is to make the ttyS namespace and minor numbers completely generic and
> let any serial port driver use it. This would be a major rework, but
> have the added advantage of cleaning up a number of other namespace
> issues as well. There also lots of open question, in particular how
> to maintain compatibility with existing drivers. One could imagine
> that each uart always gets a ttyS device and optionally also gets
> a device node for the same port with a driver specific chardev as
> most of them do today. Or it could be an either/or decision that is
> made at compile time or as a module parameter.

I'm not sure we should use ttyS for it. ttyS means 8250, a lot of
existing code knows what ttyS is and what sort of ioctls and the like are
assumed. A generic namespace needs not to be attached to a legacy naming 

(eg also put all serial ports in /dev/serial/0 /dev/serial/1 etc either
via the tty layer or via systemd/udev)

Alan
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