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: <20150320195019.GC28194@amd>
Date:	Fri, 20 Mar 2015 20:50:19 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
Cc:	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>,
	Sebastian Reichel <sre@...nel.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!

> >> 
> >> Wouldn’t it be easier to simply write
> >> 
> >> &uart1 {
> >> 	vdd-suppy = <&vaux4>;
> >> }
> > 
> > Easier to write: certainly.
> > Easier to justify? No.
> 
> I just justified.
> 
> > Easier to get merged upstream?  Definitely not.
> 
> Are you the maintainer?

And you? I believe Neil is right here, and this kind of shortcut can
not be taken.

> > After all, the uart itself doesn't require a power supply.
> > It is the device connected to the uart which requires the power supply.
> 
> Yes.

There's UART, long rs/232 cable, and a GPS.

UART needs some kind of power supply, to present voltages on the
rs/232 cable.

GPS needs some kind of power supply to work.

They are different power supplies, and we should have way to tell them
apart.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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