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From: Stephen Warren <swarren@wwwdotorg.org>
To: Grant Likely <grant.likely@secretlab.ca>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>,
	Rob Herring <robherring2@gmail.com>,
	Deepak Saxena <dsaxena@linaro.org>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Scott Wood <scottwood@freescale.com>,
	Tony Lindgren <tony@atomide.com>, Kevin Hilman <khilman@ti.com>,
	Matt Porter <mporter@ti.com>,
	Koen Kooi <koen@dominion.thruhere.net>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Felipe Balbi <balbi@ti.com>, Russ Dill <Russ.Dill@ti.com>,
	linux-omap@vger.kernel.org, devicetree-discuss@lists.ozlabs.org
Subject: Re: [RFC] Device Tree Overlays Proposal (Was Re: capebus moving omap_devices to mach-omap2)
Date: Fri, 09 Nov 2012 16:23:53 -0700	[thread overview]
Message-ID: <509D9089.7020407@wwwdotorg.org> (raw)
In-Reply-To: <CACxGe6v=+8UKerzp9z5cZo6TbXJQ4Nb=fpKgfkuvib_B-BoVdw@mail.gmail.com>

On 11/09/2012 09:28 AM, Grant Likely wrote:
> On Tue, Nov 6, 2012 at 10:37 PM, Stephen Warren <swarren@wwwdotorg.org> wrote:
...
>> I do rather suspect this use-case is quite common. NVIDIA certainly has
>> a bunch of development boards with pluggable
>> PMIC/audio/WiFi/display/..., and I believe there's some ability to
>> re-use the pluggable components with a variety of base-boards.
>>
>> Given people within NVIDIA started talking about this recently, I asked
>> them to enumerate all the boards we have that support pluggable
>> components, and how common it is that some boards support being plugged
>> into different main boards. I don't know when that enumeration will
>> complete (or even start) but hopefully I can provide some feedback on
>> how common the use-case is for us once it's done.
> 
> From your perspective, is it important to use the exact same .dtb
> overlays for those add-on boards, or is it okay to have a separate
> build of the overlay for each base tree?

I certainly think it'd be extremely beneficial to use the exact same
child board .dtb with arbitrary base boards.

Consider something like the Arduino shield connector format, which I
/believe/ has been re-used across a wide variety of Arduino boards and
other compatible or imitation boards. Now consider a vendor of an
Arduino shield. The shield vendor probably wants to publish a single
.dtb file that works for users irrespective of which board they're using
it with.

(Well, I'm not sure that Arduino can run Linux; perhaps that's why you
picked BeagleBone capes for your document!)

I suppose it would be acceptable for the shield vendor to ship the .dts
file rather than the .dtb, and hence need to build the shield .dtb for a
specific base board.

However, I think the process for an end-user needs to be as simple as
"drop this .dts/.dtb file into some standard directory", and I imagine
it'll be much easier for distros/... to make that process work if
they're dealing with a .dtb that they can just blast into the kernel's
firmware loader interface, rather than having to also locate the
base-board .dts/.dtb file, and run dtc and/or other tools on both .dts
files together.

  reply	other threads:[~2012-11-09 23:23 UTC|newest]

Thread overview: 99+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-05 20:40 [RFC] Device Tree Overlays Proposal (Was Re: capebus moving omap_devices to mach-omap2) Grant Likely
     [not found] ` <CACxGe6vu8ek7-K-yDDMXyg9x-oKiFt_cSz+Pz-yZf5U5vwe=0g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-05 21:40   ` Tabi Timur-B04825
2012-11-05 23:22     ` Tony Lindgren
     [not found]       ` <20121105232218.GA8284-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2012-11-09 12:06         ` Grant Likely
2012-11-06  0:07     ` Grant Likely
2012-11-06 10:31     ` Pantelis Antoniou
2012-11-07 22:35     ` Ryan Mallon
2012-11-08 13:28       ` Koen Kooi
2012-11-08 14:09         ` Timur Tabi
2012-11-08 17:00         ` Mitch Bradley
2012-11-06 22:37   ` Stephen Warren
     [not found]     ` <50999145.2070306-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-11-07  0:54       ` Mitch Bradley
2012-11-09 17:02         ` Grant Likely
2012-11-12 11:29           ` Pantelis Antoniou
2012-11-07  8:47     ` Pantelis Antoniou
2012-11-07 17:18       ` Stephen Warren
     [not found]         ` <509A97D0.5010006-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-11-07 22:08           ` Pantelis Antoniou
2012-11-09 16:28     ` Grant Likely
2012-11-09 23:23       ` Stephen Warren [this message]
2012-11-09 23:40         ` Grant Likely
2012-11-12 10:53           ` Koen Kooi
     [not found]         ` <509D9089.7020407-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-11-12 12:10           ` Pantelis Antoniou
2012-11-12 16:52             ` Stephen Warren
2012-11-13  7:25               ` David Gibson
     [not found]                 ` <20121113072517.GE25915-W9XWwYn+TF0XU02nzanrWNbf9cGiqdzd@public.gmane.org>
2012-11-13  8:09                   ` Pantelis Antoniou
2012-11-13 12:24                     ` Grant Likely
     [not found]                       ` <CACxGe6vQxmAk_joUYbaXw4r8J3_RbQt22zFg84ANvcw+ycCMHg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13 13:38                         ` Pantelis Antoniou
2012-11-15  4:57                           ` David Gibson
2012-11-13 17:10                     ` Stephen Warren
     [not found]                     ` <BD20AE03-C138-4BC6-AE02-F162AF6840B2-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
2012-11-13 23:30                       ` David Gibson
2012-11-14  0:00                         ` Pantelis Antoniou
2012-11-13 16:57                 ` Stephen Warren
     [not found]                   ` <50A27BF1.4030502-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-11-13 18:10                     ` Mitch Bradley
     [not found]                       ` <50A28D03.7050002-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2012-11-13 18:29                         ` Stephen Warren
2012-11-13 19:09                           ` Mitch Bradley
2012-11-13 19:11                             ` Pantelis Antoniou
2012-11-17 22:27         ` Jean-Christophe PLAGNIOL-VILLARD
2012-11-20 17:09           ` Grant Likely
2012-11-11 20:47       ` Rob Landley
2012-11-12 12:50         ` Pantelis Antoniou
     [not found]           ` <ABAD0875-A618-405D-954F-CD76F09DDF04-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
2012-11-12 16:54             ` Stephen Warren
2012-11-12 11:23       ` Pantelis Antoniou
2012-11-12 16:49         ` Stephen Warren
2012-11-12 17:00           ` Pantelis Antoniou
2012-11-12 17:10             ` Stephen Warren
2012-11-12 17:19               ` Pantelis Antoniou
2012-11-12 17:29                 ` Stephen Warren
2012-11-12 17:38                   ` Pantelis Antoniou
2012-11-12 20:16         ` Russ Dill
2012-11-12 16:45       ` Stephen Warren
2012-11-12 11:03   ` Koen Kooi
2012-11-06 10:30 ` Pantelis Antoniou
2012-11-06 11:14   ` Grant Likely
2012-11-06 18:35     ` Tony Lindgren
2012-11-06 19:29       ` Russ Dill
     [not found]         ` <CA+Bv8XZOt7h3dtDsk1SaR71J3tYFOTsPJSjZLSP3RVuLdYdFDg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-06 19:41           ` Pantelis Antoniou
2012-11-06 22:17             ` Stephen Warren
2012-11-06 19:34     ` Pantelis Antoniou
2012-11-06 20:45       ` Grant Likely
2012-11-06 20:50         ` Grant Likely
2012-11-07  8:06         ` Pantelis Antoniou
2012-11-07 15:33           ` Alan Tull
2012-11-09 17:03           ` Grant Likely
2012-11-07  8:13         ` Pantelis Antoniou
     [not found]           ` <5ED17D42-07B8-4D4F-B54F-82B4CC60584C-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
2012-11-07 10:19             ` Benoit Cousson
2012-11-07 11:02               ` Pantelis Antoniou
     [not found]                 ` <A6697FB9-3614-4027-A71B-59C7556005BF-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
2012-11-07 11:12                   ` Benoit Cousson
2012-11-07 11:23                     ` Pantelis Antoniou
2012-11-09 20:33                 ` Grant Likely
2012-11-12 11:34                   ` Pantelis Antoniou
2012-11-12 13:01                     ` Grant Likely
2012-11-07 17:25               ` Stephen Warren
     [not found]                 ` <509A9984.3000709-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-11-07 22:10                   ` Pantelis Antoniou
2012-11-08 10:36                 ` Cousson, Benoit
2012-11-09  5:32   ` Joel A Fernandes
2012-11-09 14:29     ` David Gibson
2012-11-10  3:15       ` Joel A Fernandes
2012-11-09 21:22     ` Grant Likely
     [not found]       ` <CACxGe6vL9gbAKyDWcZWWAQ4WO=nTgdAioXS-h2e1jtJK9pmZUg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-12 11:47         ` Pantelis Antoniou
2012-11-13  3:59       ` Joel A Fernandes
2012-11-09 22:59     ` Stephen Warren
     [not found]   ` <-4237940489086529028@unknownmsgid>
     [not found]     ` <559B8433-67C3-4A1A-A5D6-859907655176@antoniou-consulting.com>
     [not found]       ` <559B8433-67C3-4A1A-A5D6-859907655176-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
2012-11-10  3:36         ` Joel A Fernandes
2012-11-12 12:48           ` Pantelis Antoniou
2012-11-13  2:28           ` David Gibson
2012-11-09  2:26 ` David Gibson
2012-11-09 15:40   ` Pantelis Antoniou
     [not found]     ` <A97699E9-6C57-4A56-BC45-86A57CF2496F-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>
2012-11-13  0:03       ` David Gibson
2012-11-09 21:08   ` Grant Likely
     [not found]     ` <CACxGe6v7q2=Dxn6BE_V-w9CEKxAsZ6zQd5Uqm4TeYGYCCu76cg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13  0:05       ` David Gibson
2012-11-09 21:42   ` Grant Likely
     [not found]     ` <CACxGe6vQ50aS0Fe7QvTHKfV=EDpsZoLC7SOxXLGc0pkMvyk5DQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-11-13  1:05       ` David Gibson
2012-11-13  5:22         ` Stephen Warren
     [not found]           ` <50A1D8FF.7060104-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-11-13  6:54             ` David Gibson
2012-11-09 22:57   ` Stephen Warren
2012-11-09 23:27     ` Grant Likely
2012-11-12 12:05     ` Pantelis Antoniou
     [not found]   ` <20121109022624.GI23553-W9XWwYn+TF0XU02nzanrWNbf9cGiqdzd@public.gmane.org>
2012-11-09 23:14     ` Stephen Warren
2012-11-09 23:06 ` Stephen Warren
2012-11-09 23:32   ` Grant Likely

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