linux-kernel - Re: [RFC] Device Tree Overlays Proposal (Was Re: capebus moving omap

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Message-Id: <11727BE5-7173-4383-BD0E-751EFD093706@dominion.thruhere.net>
Date:	Mon, 12 Nov 2012 12:03:23 +0100
From:	Koen Kooi <koen@...inion.thruhere.net>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Pantelis Antoniou <panto@...oniou-consulting.com>,
	Rob Herring <robherring2@...il.com>,
	Deepak Saxena <dsaxena@...aro.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Scott Wood <scottwood@...escale.com>,
	Tony Lindgren <tony@...mide.com>, Russ Dill <Russ.Dill@...com>,
	Felipe Balbi <balbi@...com>, Benoit Cousson <b-cousson@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Matt Porter <mporter@...com>, linux-omap@...r.kernel.org,
	Kevin Hilman <khilman@...com>, Paul Walmsley <paul@...an.com>,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [RFC] Device Tree Overlays Proposal (Was Re: capebus moving omap_devices to mach-omap2)


Op 5 nov. 2012, om 21:40 heeft Grant Likely <grant.likely@...retlab.ca> het volgende geschreven:

> Hey folks,
> 
> As promised, here is my early draft to try and capture what device
> tree overlays need to do and how to get there. Comments and
> suggestions greatly appreciated.
> 
> Device Tree Overlay Feature
> 
> Purpose
> =======
> Sometimes it is not convenient to describe an entire system with a
> single FDT. For example, processor modules that are plugged into one or
> more modules (a la the BeagleBone), or systems with an FPGA peripheral
> that is programmed after the system is booted.
> 
> For these cases it is proposed to implement an overlay feature for the
> so that the initial device tree data can be modified by userspace at
> runtime by loading additional overlay FDTs that amend the original data.
> 
> User Stories
> ============
> Note - These are potential use cases, but just because it is listed here
> doesn't mean it is important. I just want to thoroughly think through the
> implications before making design decisions.

I think the beaglebone use cases cover it as well, but it deserves a seperate mention: SOMs. Gumstix is a good example of those, their website has a list of the different expansionboards they sell so we can see if we missed a use case somewhere.
Their expansionboards have an EEPROM to ID them, just like the beagleboard classic/xM expansionboards, but I don't know if all 3rd party vendors honour that standard. I know the Ettus USRP E-100 on my desk has it.

regards,

Koen--
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