linux-kernel - Re: [PATCH v5] dtb: Create a common home for cross-architecture dtsi files.

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Message-ID: <CAOesGMj46mvbdya1OQnZzL8VrxVwxAV3KoZZRtk3c0CTVx7d5w@mail.gmail.com>
Date:	Sun, 23 Aug 2015 16:13:54 -0700
From:	Olof Johansson <olof@...om.net>
To:	Rob Herring <robherring2@...il.com>
Cc:	Ian Campbell <ian.campbell@...rix.com>,
	"arm@...nel.org" <arm@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Liviu Dudau <liviu.dudau@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Kristina Martsenko <kristina.martsenko@....com>,
	Kevin Hilman <khilman@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v5] dtb: Create a common home for cross-architecture dtsi files.

On Fri, Aug 14, 2015 at 2:21 PM, Rob Herring <robherring2@...il.com> wrote:
> +arm-soc
>
> On Tue, Aug 11, 2015 at 5:07 AM, Ian Campbell <ian.campbell@...rix.com> wrote:
>> On Mon, 2015-08-03 at 17:06 +0100, Ian Campbell wrote:
>>> Commit 9ccd608070b6 ("arm64: dts: add device tree for ARM SMM-A53x2 on
>>> LogicTile Express 20MG") added a new dts file to arch/arm64 which
>>> included "../../../../arm/boot/dts/vexpress-v2m-rs1.dtsi", i.e. a
>>> .dtsi supplied by arch/arm.
>>>
>>> Unfortunately this causes some issues for the split device tree
>>> repository[0], since things get moved around there. In that context
>>> the new .dts ends up at src/arm64/arm/vexpress-v2f-1xv7-ca53x2.dts
>>> while the include is at src/arm/vexpress-v2m-rs1.dtsi.
>>
>> Hi Grant,
>>
>> Do you think there is any chance of getting this into 4.2-rc$NEXT or shall
>> we wait until 4.3? I'm assuming this should go via the DT tree, but maybe
>> it should go via an ARM tree?
>
> I was assuming this would go thru the arm-soc tree which is why I
> acked it. It is getting a bit late for 4.2 at this point, but I guess
> the standalone tree remains broken for these platforms until this is
> done. Probably not such a big deal in grand scheme of things.

I'm cc:d in the far tail of a thread, so I'll just comment here
instead of further up:

I'm not a fan at all of creating kernel/dts/<arch>/*, at least if
there's expected to be contents in there.

We don't have include/linux/asm-<arch>/ in the common tree either.
Let's not create that for dts.

So, while I'm all for a prefix-based sharing of DTSI files, I don't
want them to go in a common kernel/dts directory.

Besides sharing some snippets between arm and arm64, what else is
expected to need to go into such a shared location today?


-Olof
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