Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754196AbbG2OiS (ORCPT ); Wed, 29 Jul 2015 10:38:18 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:11674 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751291AbbG2OiQ (ORCPT ); Wed, 29 Jul 2015 10:38:16 -0400 X-IronPort-AV: E=Sophos;i="5.15,571,1432598400"; d="scan'208";a="288888169" Message-ID: <1438180692.11600.206.camel@citrix.com> Subject: Re: [PATCH v2] dtb: Create a common home for cross-architecture dtsi files. From: Ian Campbell To: Mark Rutland CC: Masahiro Yamada , "devicetree@vger.kernel.org" , "Lorenzo Pieralisi" , Russell King , Pawel Moll , "Linux Kbuild mailing list" , Catalin Marinas , Sudeep Holla , Liviu Dudau , Linux Kernel Mailing List , Will Deacon , "Rob Herring" , Kristina Martsenko , Kumar Gala , "Kevin Hilman" , linux-arm-kernel Date: Wed, 29 Jul 2015 15:38:12 +0100 In-Reply-To: <20150729132758.GR15213@leverpostej> References: <1437993343-9542-1-git-send-email-ian.campbell@citrix.com> <1438176174.11600.198.camel@citrix.com> <20150729132758.GR15213@leverpostej> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.16.3-1 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-DLP: MIA1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3317 Lines: 85 On Wed, 2015-07-29 at 14:27 +0100, Mark Rutland wrote: > 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 : > > > > 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. I'm inclined to leave it, "visible to C sources" doesn't seem like that much of an issue and IMHO the cure (kernel/dts/...) is worse than the disease. @@ -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 > > > > }; > > > > }; > > > > > > > > > > > > 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... If it did, yes. I don't think vexpress-v2m-rs1.dtsi does, since it is using /include/ today. I'm inclined to switch back to /include/ unless someone objects. > > > 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/. Indeed, I've done that locally already. Ian. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/