linux-kernel - Re: [Gta04-owner] [PATCH 0/3] tty slave device support

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Message-ID: <CAL_Jsq+exFg17M-f_nKHM+RHKmkFPzrdn9RscOD1y=TB6oU_jg@mail.gmail.com>
Date:	Thu, 7 May 2015 10:48:13 -0500
From:	Rob Herring <robherring2@...il.com>
To:	"Dr. H. Nikolaus Schaller" <hns@...delico.com>
Cc:	List for communicating with real GTA04 owners 
	<gta04-owner@...delico.com>, NeilBrown <neil@...wn.name>,
	Mark Rutland <mark.rutland@....com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sebastian Reichel <sre@...nel.org>,
	Pavel Machek <pavel@....cz>,
	Grant Likely <grant.likely@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Gta04-owner] [PATCH 0/3] tty slave device support - version 3.

On Wed, May 6, 2015 at 12:19 AM, Dr. H. Nikolaus Schaller
<hns@...delico.com> wrote:
> Hi Peter,
>
> Am 05.05.2015 um 21:54 schrieb Peter Hurley <peter@...leysoftware.com>:
>
>> Hi Neil,
>>
>> On 03/18/2015 01:58 AM, NeilBrown wrote:
>>> here is version 3 of support for tty-slaves.
>>
>> Is there a v4 of this that I missed?

I'm interested in seeing this to completion as well.

> We did have a lengthy discussion about [PATCH 3/3] how to best (1)
> represent the slave device in the device tree but as far as I am concerned,
> I do not see that we have a consensus (2) and the device tree maintainers
> have no comments or clear guidelines so far.

I'm just catching up on the thread, but I agree with what Sebastian
has said at least on regulators.

>
> BR,
> Nikolaus
>
> (1) best with respect to maintainability, flexibility, common design patterns,
> compatibility and some other factors I don’t know the correct english words for
> (2) basically the slave can be described as a subnode like for I2C bus slaves
> or the slave device can reference the uart it is connected to like for GPIOs
> and regulators--

I'm not sure I follow the debate on sub-nodes, but it is a pretty well
defined pattern that sub-nodes are describing a connection to parent
nodes. Usually it follows the main/data connection and not some
side-band connections like regulators or gpios.

Rob

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