linux-kernel - Re: [PATCH v2] dtb: Create a common home for cross-architecture dtsi files.

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Date:	Thu, 30 Jul 2015 10:30:27 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Ian Campbell <ian.campbell@...rix.com>,
	Mark Rutland <mark.rutland@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <pawel.moll@....com>,
	Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Liviu Dudau <liviu.dudau@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Kristina Martsenko <kristina.martsenko@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	Kevin Hilman <khilman@...aro.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] dtb: Create a common home for cross-architecture dtsi files.

Hi,


2015-07-30 0:23 GMT+09:00 Rob Herring <robherring2@...il.com>:
> On Wed, Jul 29, 2015 at 8:22 AM, Ian Campbell <ian.campbell@...rix.com> wrote:
>> On Wed, 2015-07-29 at 20:07 +0900, Masahiro Yamada wrote:
>>> Hi Ian,
>>>
>>>
>>> 2015-07-27 19:35 GMT+09:00 Ian Campbell <ian.campbell@...rix.com>:
>>> > 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.
>>> >
>>> > The sharing of the .dtsi is legitimate since the baseboard is the same
>>> > for various vexpress systems whatever processor they use.
>>> >
>>> > Rather than using ../../ tricks to pickup .dtsi files from another
>>> > arch this patch creates a new directory include/dt-dtsi as a
>>> > home for such cross-arch .dtsi files, arranges for it to be in the
>>> > include path when the .dts files are processed by cpp and switches the
>>>
>>>
>>> "include/dt-dtsi/"  can be referenced from normal C sources.
>>>
>>> I think another possible home for cross-arch DTSI is "kernel/dts/".
>>> This directory can be hidden from C sources.
>>
>> I suppose, I don't really mind and will follow the direction of the other
>> DTB maintainers. It doesn't seem like a big deal to me.
>
> Seems fine to me. We might think of other things to put here that are
> not includes. Overlays perhaps?


Putting device trees below "include/" seems weird to me.


I thought, kernel/  is a place where we put something common among
architectures.


"kernel/configs/" was created as a home for cross-arch config fragments.


arch/${ARCH}/configs/  -  arch-specific *_defconfig and *.config
kernel/configs/        -  arch-common  *.config


Likewise,

arch/${ARCH}/boot/dts  -  arch-specific *.dts and *.dtsi
kernel/dts             -  arch-common  *.dtsi


This is just a matter of preference, though.



-- 
Best Regards
Masahiro Yamada
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