linux-kernel - Re: [Gta04-owner] [PATCH 3/3] tty/slaves: add a driver to power on/off UART attached devices.

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Message-ID: <20150404075241.GC31064@amd>
Date:	Sat, 4 Apr 2015 09:52:41 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
Cc:	Sebastian Reichel <sre@...nel.org>, NeilBrown <neilb@...e.de>,
	List for communicating with real GTA04 owners 
	<gta04-owner@...delico.com>, 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>,
	Grant Likely <grant.likely@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>, devicetree@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [Gta04-owner] [PATCH 3/3] tty/slaves: add a driver to power
 on/off UART attached devices.

Hi!

> >> And if you want to hide uart1 from the user-space, that should be a property
> >> of the uart1 node (whereever it is defined).
> > 
> > Sorry? That would be one heck of layering violation.
> 
> Which layering?

Device tree is not operating system specific. It does not know what
"user space" is, and can't assume we have uart nodes in
/dev. Therefore it can't contain information that it should be hidden.

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