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

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Message-ID: <20150729132758.GR15213@leverpostej>
Date:	Wed, 29 Jul 2015 14:27:58 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	Masahiro Yamada <yamada.masahiro@...ionext.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>,
	Sudeep Holla <Sudeep.Holla@....com>,
	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>,
	Kumar Gala <galak@...eaurora.org>,
	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.

On Wed, Jul 29, 2015 at 02:22:54PM +0100, Ian Campbell 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.

I don't really have a preference either way.

> > >@@ -223,7 +223,7 @@ Example of a VE tile description (simplified)
> > >                 /* Active high IRQ 0 is connected to GIC's SPI0 */
> > >                 interrupt-map = <0 0 0 &gic 0 0 4>;
> > > 
> > > -               /include/ "vexpress-v2m-rs1.dtsi"
> > > +               #include <arm/vexpress-v2m-rs1.dtsi>
> > >         };
> > >  };
> > 
> > 
> > 
> > You do not have to replace /include/ with #include,
> > if you add the include path for DTC.
> 
> Ah, I looked for this but -i is not documented in the man page.
> 
> Is there any reason to prefer one over the other?

#include allows you to use CPP in the file you're including, /include/
does not.

I would imagine we have to use #include in case the dtsi itself has
#include statements...

> > Please add include path for DTC too
> > so that both /include/ and #include are available.

... though that does not preclude adding it to the path for /include/.

Thanks,
Mark.

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