linux-kernel - Re: [PATCH v3 7/9] ARM: add Armada 1500 and Sony NSZ-GS7 device tree files

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Message-ID: <20131108202930.GL10335@titan.lakedaemon.net>
Date:	Fri, 8 Nov 2013 15:29:30 -0500
From:	Jason Cooper <jason@...edaemon.net>
To:	Olof Johansson <olof@...om.net>
Cc:	Kumar Gala <galak@...eaurora.org>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 7/9] ARM: add Armada 1500 and Sony NSZ-GS7 device
 tree files

On Fri, Nov 08, 2013 at 12:10:27PM -0800, Olof Johansson wrote:
> On Fri, Nov 8, 2013 at 11:30 AM, Jason Cooper <jason@...edaemon.net> wrote:
> > On Fri, Nov 08, 2013 at 11:14:07AM -0800, Olof Johansson wrote:
> >> On Fri, Nov 8, 2013 at 10:24 AM, Jason Cooper <jason@...edaemon.net> wrote:
> >> > On Fri, Nov 08, 2013 at 12:06:26PM -0600, Kumar Gala wrote:
> >> >>
> >> >> On Nov 8, 2013, at 10:57 AM, Jason Cooper wrote:
> >> >>
> >> >> > On Fri, Nov 08, 2013 at 10:13:19AM -0600, Kumar Gala wrote:
> >> >> >> On Nov 5, 2013, at 8:28 AM, Sebastian Hesselbarth wrote:
> >> >> > ...
> >> >> >>> .../devicetree/bindings/arm/marvell,berlin.txt     |   24 +++
> >> >> >>> arch/arm/boot/dts/Makefile                         |    2 +
> >> >> >>> arch/arm/boot/dts/berlin2-sony-nsz-gs7.dts         |   29 +++
> >> >> >>> arch/arm/boot/dts/berlin2.dtsi                     |  227 ++++++++++++++++++++
> >> >> >>> 4 files changed, 282 insertions(+)
> >> >> >>> create mode 100644 Documentation/devicetree/bindings/arm/marvell,berlin.txt
> >> >> >>> create mode 100644 arch/arm/boot/dts/berlin2-sony-nsz-gs7.dts
> >> >> >>> create mode 100644 arch/arm/boot/dts/berlin2.dtsi
> >> >> >>
> >> >> >> Haven't we been trying to go away from non-prefixed dts/dtsi?
> >> >> >
> >> >> > hmmm, this is the first I've heard of that.  Although, your proposal
> >> >> > (in another thread) makes more sense now.  :)
> >> >> >
> >> >> >> So should these be something like marvell-berlin2-...
> >> >> >
> >> >> > I don't recall this being brought up at the summit, nor in Grant's
> >> >> > report.  I do need to give it a more careful read this weekend, though.
> >> >> > Perhaps I missed something.
> >> >>
> >> >> This was based on review comments Olof gave when we pushed some .dts
> >> >> files for MSM/APQ Qualcomm Technologies soc/boards.
> >> >
> >> > As Andrew Lunn mentioned to me earlier, we should consider the fact that
> >> > the dts file names are being used by Debian's flash-kernel.  Oh no!
> >> > Another ABI! ;-)
> >>
> >> Yes, the names are mostly stable. ST-Ericsson renamed their dts files
> >> and it caused some pain, some build environments have them hardcoded,
> >> etc.
> >>
> >> Still, it is a good idea to start adding new ones using family or
> >> vendor prefixes, so they are easier to group. Please keep that in mind
> >> on new ones too, Jason -- I don't think I've discussed with you in the
> >> past. :-)
> >
> > Nope, I definitely missed that if you did ;-)  Will do in the future.
> >
> > Perhaps now is the time to consider separating the dts filename from the
> > dtb filename?  I'm warming up to my idea of globalscale,mirabox.dtb...
> 
> Having a "dtb-install" make target that sets those up as softlinks
> could be a good idea, at least.

oooh, I like that.  Something like

$ dtc -L -o kirkwood-dreamplug.dtb kirkwood-dreamplug.dts
$ ls
...
globalscale,dreamplug.dtb -> kirkwood-dreamplug.dtb
...
kirkwood-dreamplug.dtb
...
$

Otherwise the build system would have to learn to parse dts/dtbs...

> I'm not sold on using them as filenames myself though.

fair enough.

thx,

Jason.
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