linux-kernel - Re: [PATCH 1/7] kbuild: create an "include chroot" for DT bindings

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Message-ID: <20130318151348.GB4713@S2101-09.ap.freescale.net>
Date:	Mon, 18 Mar 2013 23:13:50 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	<arm@...nel.org>, Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Michal Marek <mmarek@...e.cz>, <linux-kbuild@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Stephen Warren <swarren@...dia.com>,
	Hiroshi Doyu <hdoyu@...dia.com>
Subject: Re: [PATCH 1/7] kbuild: create an "include chroot" for DT bindings

On Wed, Mar 06, 2013 at 11:22:57AM -0700, Stephen Warren wrote:
> From: Stephen Warren <swarren@...dia.com>
> 
> The recent dtc+cpp support allows header files and C pre-processor
> defines/macros to be used when compiling device tree files. These
> headers will typically define various constants that are part of the
> device tree bindings.
> 
> The original patch which set up the dtc+cpp include path only considered
> using those headers from device tree files. However, most are also
> useful for kernel code which needs to interpret the device tree.
> 
> In both the DT files and the kernel, I'd like to include the DT-related
> headers in the same way, for example, <dt-bindings/gpio/tegra-gpio.h>.
> That will simplify any text which discusses the DT header locations.
> 
> Creating a <dt-bindings/> for kernel source to use is as simple as
> placing files into include/dt-bindings/.
> 
> However, when compiling DT files, the include path should be restricted
> so that only the dt-bindings path is available; arbitrary kernel headers
> shouldn't be exposed. For this reason, create a specific include
> directory for use by dtc+cpp, and symlink dt-bindings from there to the
> actual location of include/dt-bindings/. For want of a better location,
> place this "include chroot" into the existing dts/ directory.
> 
> arch/*/boot/dts/include/dt-bindings -> ../../../../../include/dt-bindings
> 
> Some headers used by device tree files may not be useful to the kernel;
> they may be used simply to aid in constructing the DT file (e.g. macros
> to create a node), but not define any information that the kernel needs
> to share. These may be placed directly into arch/*/boot/dts/ along with
> the DT files themselves.
> 
> Cc: Shawn Guo <shawn.guo@...aro.org>
> Cc: Hiroshi Doyu <hdoyu@...dia.com>
> Acked-by: Michal Marek <mmarek@...e.cz>
> Acked-by: Shawn Guo <shawn.guo@...aro.org>
> Acked-by: Rob Herring <rob.herring@...xeda.com>
> Signed-off-by: Stephen Warren <swarren@...dia.com>
> ---
> This first patch was previously posted separately as V2. I'm including
> it here to keep it with the whole series. I hope this series can be
> applied as a topic branch in arm-soc.

So no comments on the series means that we can start maintain it on
a topic branch, so that people can base their works on it?

Shawn

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