linux-kernel - Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays

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Message-Id: <D7FC4B45-D6EC-4294-B0B4-58546CC9DA49@antoniou-consulting.com>
Date:	Thu, 7 Nov 2013 09:27:06 +0200
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Sebastian Andrzej Siewior <bigeasy@...akpoint.cc>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robherring2@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3 - V2] Introducing Device Tree Overlays

Hi Guenter,

On Nov 6, 2013, at 11:17 PM, Guenter Roeck wrote:

> On Wed, Nov 06, 2013 at 09:38:21PM +0100, Sebastian Andrzej Siewior wrote:
>> On 06.11.13, Guenter Roeck wrote:
>>> At least that is our use case. u-boot doesn't know which cards are going to be
>>> inserted at runtime. Even PCIe hotplug itself is insufficient, as the PCIe
>>> configuration differs per card, and the cards support a variety of i2c devices
>>> as well as other card specific devices such LEDs and multi-function FPGAs.
>> 
>> So you have your FPGA behind PCIe and you use the DT to describe the
>> chips behind i2c? And then you update your FPGA and want update the
>> devices in DT without reboot?
>> 
> No.
> 
> We have a variety of boards ...
[snip]

TL;DR the real world...

> 
> We use DT overlays to describe the hardware on those boards and, if necessary,
> its configuration. For example, if there is a PCIe switch, the overlay would
> describe its memory and bus number configuration.
> 
> Guenter

Glad it's been useful...

Regards

-- Pantelis--
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