From mboxrd@z Thu Jan  1 00:00:00 1970
From: NeilBrown <neilb@suse.de>
Subject: Re: [Gta04-owner] [PATCH 2/3] TTY: add support for tty_slave
 devices.
Date: Thu, 26 Mar 2015 08:17:29 +1100
Message-ID: <20150326081729.700a7a6e@notabene.brown>
References: <20150318055437.21025.13990.stgit@notabene.brown>
	<20150318055831.21025.85317.stgit@notabene.brown>
	<5512E288.4020703@hurleysoftware.com>
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To: Peter Hurley <peter@hurleysoftware.com>
Cc: NeilBrown <neil@brown.name>, Mark Rutland <mark.rutland@arm.com>, One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>, Arnd Bergmann <arnd@arndb.de>, devicetree@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Sebastian Reichel <sre@kernel.org>, linux-kernel@vger.kernel.org, GTA04 owners <gta04-owner@goldelico.com>, Pavel Machek <pavel@ucw.cz>, Grant Likely <grant.likely@linaro.org>, Jiri Slaby <jslaby@suse.cz>
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On Wed, 25 Mar 2015 12:30:00 -0400 Peter Hurley <peter@hurleysoftware.com>
wrote:

> On 03/18/2015 01:58 AM, NeilBrown wrote:
>=20
> > + * A "tty-slave" is a device permanently attached to a particularly
> > + * tty, typically wired to a UART.
>=20
> Why "permanently"?
> Is that a limitation of the implementation or design?
>=20

The slave is described in devicetree - that only happens for permanently
attached devices, doesn't it?

I guess that with device-tree overlays and 'capes' for boards you could have
a device attached to the uart "for this power session" rather than
"permanently", but I think it is a rather subtle distinction.

Did you have something else in mind?

NeilBrown

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