linux-kernel - Re: [PATCH] kbuild: Don't assume dts files live in arch/*/boot/dts

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Date:	Wed, 08 May 2013 08:50:49 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Matthijs Kooijman <matthijs@...in.nl>
CC:	Michal Marek <mmarek@...e.cz>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-kbuild@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH] kbuild: Don't assume dts files live in arch/*/boot/dts

On 05/08/2013 04:59 AM, Matthijs Kooijman wrote:
> In commit b40b25ff (kbuild: always run gcc -E on *.dts, remove cmd_dtc_cpp),
> dts building was changed to always use the C preprocessor. This meant
> that the .dts file passed to dtc is not the original, but the
> preprocessed one.
> 
> When compiling with a separate build directory (i.e., with O=), this
> preprocessed file will not live in the same directory as the original.
> When the .dts file includes .dtsi files, dtc will look for them in the
> build directory, not in the source directory and compilation will fail.
> 
> The commit referenced above tried to fix this by passing arch/*/boot/dts
> as an include path to dtc. However, for mips, the .dts files are not in
> this directory, so dts compilation on mips breaks for some targets.
> 
> Instead of hardcoding this particular include path, this commit just
> uses the directory of the .dts file that is being compiled, which
> effectively restores the previous behaviour wrt includes. For most .dts
> files, this path is just the same as the previous hardcoded
> arch/*/boot/dts path.
> 
> This was tested on a mips (rt3052) and an arm (bcm2835) target.

Reviewed-by: Stephen Warren <swarren@...dia.com>

(although I wonder if the .dts files shouldn't be in a standard location?)
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