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

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Date:	Wed, 29 Apr 2015 08:56:25 +0200
From:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
To:	Pavel Machek <pavel@....cz>, devicetree@...r.kernel.org
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>,
	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 Pavel,

Am 27.04.2015 um 22:35 schrieb Pavel Machek <pavel@....cz>:

> Hi!
> 
>>> In my opinion making something a node in / is always the
>>> last resort and in my perspective it has been handled in such a way
>>> so far.
>> 
>> But that contradicts some documents I have found and linked. Please
>> show me a document about DT that supports your view.
>> 
>> I agree that both views can be valid, but in lack of some ?official? guideline
>> we can?t decide ourselves.
> 
> This is not how kernel development works.
> 
> We can decide ourselves, and DT people will swear at us if we decide wrongly,
> and then Linus swears at them if they do too obvious mistakes.
> 
> Lets KISS.

some time ago you also wrote in this thread:

> Device tree is not operating system specific. 

In other words: this is a discussion about compatibility with the world outside of Linux.
And compatibility can not be achieved by decisions about Linux implementation details,
even if Linus is deciding. He can just decide to stay incompatible (but then it should
IMHO be a general decision and not case specific).

So I think we should follow some basic design principles, if they exist (which I don’t know),
to have this compatibility. And then adapt the Linux implementation (using the KISS principle).

Anyways I have not yet seen any comment from the DT people or did I miss them?

BR,
Nikolaus

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