linux-kernel - Re: [Gta04-owner] [PATCH 2/3] TTY: add support for tty

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Message-ID: <20150326081729.700a7a6e@notabene.brown>
Date:	Thu, 26 Mar 2015 08:17:29 +1100
From:	NeilBrown <neilb@...e.de>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	NeilBrown <neil@...wn.name>, Mark Rutland <mark.rutland@....com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	linux-kernel@...r.kernel.org,
	GTA04 owners <gta04-owner@...delico.com>,
	Pavel Machek <pavel@....cz>,
	Grant Likely <grant.likely@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: Re: [Gta04-owner] [PATCH 2/3] TTY: add support for tty_slave
 devices.

On Wed, 25 Mar 2015 12:30:00 -0400 Peter Hurley <peter@...leysoftware.com>
wrote:

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

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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