Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992631AbbEPAro (ORCPT ); Fri, 15 May 2015 20:47:44 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:34620 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992541AbbEPArl (ORCPT ); Fri, 15 May 2015 20:47:41 -0400 Message-ID: <555693AA.1000105@gmail.com> Date: Fri, 15 May 2015 17:47:38 -0700 From: Frank Rowand Reply-To: frowand.list@gmail.com User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: Pantelis Antoniou CC: Geert Uytterhoeven , linux-kbuild@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH/RFC] kbuild: Create a rule for building device tree overlay objects References: <1431431816-24612-1-git-send-email-geert+renesas@glider.be> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2344 Lines: 69 On 5/12/2015 7:33 AM, Pantelis Antoniou wrote: > Hi Geert, > >> On May 12, 2015, at 14:56 , Geert Uytterhoeven wrote: >> >> This allows to handle device tree overlays like plain device trees. >> >> Signed-off-by: Geert Uytterhoeven >> --- >> Questions: >> - Do we want dtso files under arch//boot/dts/, too? >> - Do we want to move the dts files outside the kernel repository >> first? >> > > Oh that’s a nice hornet’s nest you’ve kicked here. > > arch//boot/dts should not be the place, cause overlays are not related with boot per se. > As they are right now are board (family) specific. Aren't overlays meant to describe child boards (capes, shields, whatever) that may vary from system to system, but are not expected to be hot-plugged while the OS is up? Or is hot-plug a design goal? If no hot-plug, then to me an overlay is just as related to boot as the base dts. It is a mere implementation detail that overlays are "loaded" from userspace instead of by the booting kernel (I don't really know the details of using overlays, so please correct me if I am wrong about how the kernel becomes aware of an overlay). > > I think we should try to keep an external kernel repo with them for now until we > figure out where to put them. > >> scripts/Makefile.lib | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib >> index 79e86613712f2230..4b14eef1d4b2ce8f 100644 >> --- a/scripts/Makefile.lib >> +++ b/scripts/Makefile.lib >> @@ -292,6 +292,9 @@ cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ >> $(obj)/%.dtb: $(src)/%.dts FORCE >> $(call if_changed_dep,dtc) >> >> +$(obj)/%.dtbo: $(src)/%.dtso FORCE >> + $(call if_changed_dep,dtc) >> + >> dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) >> >> # Bzip2 >> -- >> 1.9.1 > > Regards > > — Pantelis > > -- > To unsubscribe from this list: send the line "unsubscribe devicetree" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- 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/