linux-kernel - Re: [PATCH 0/3] tty slave device support

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Message-ID: <20150320193119.GA28194@amd>
Date:	Fri, 20 Mar 2015 20:31:19 +0100
From:	Pavel Machek <pavel@....cz>
To:	NeilBrown <neil@...wn.name>
Cc:	Mark Rutland <mark.rutland@....com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Peter Hurley <peter@...leysoftware.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>,
	GTA04 owners <gta04-owner@...delico.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] tty slave device support - version 3.

Hi!

>  here is version 3 of support for tty-slaves.
> 
>  This version introduces a new bus-type for tty-slaves, and causes
>  a tty-slave device to appear in /sys/devices between the uart and the
>  tty.
>  It effectively intercepts and calls from the tty to the uart (i.e. any
>  tty_operations) and applies extra functionality at that point.
> 
>  Currently the only driver intercepts open and close.
>  It powers on the device on open, and powers off at last-close.
> 
>  Power can be controlled by a regulator or by toggling a GPIO.
> 
>  I think I've incorporated most of the feed back I received from
>  previous versions, but if I missed something - I apologize.  If
>  this approach is structurally acceptable then I can fix up all the
>  smaller issues.

Do you have dts example? Anyway, we'll need something similar for
bluetooth on N900. But we'd like the /dev/ttyXX not to be visible to
the userspace in that case.

Thanks,
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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