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authorStephen Warren <swarren@nvidia.com>2013-02-20 13:39:41 -0700
committerStephen Warren <swarren@nvidia.com>2013-04-05 12:22:32 -0600
commitc58299aa87544a590c62bda0bf52b69fa56cb8d5 (patch)
tree59d5f2b7a23fe8ed32e89b5c961094fb2ccbd8a4
parent6dbe51c251a327e012439c4772097a13df43c5b8 (diff)
downloadop-kernel-dev-c58299aa87544a590c62bda0bf52b69fa56cb8d5.zip
op-kernel-dev-c58299aa87544a590c62bda0bf52b69fa56cb8d5.tar.gz
kbuild: create an "include chroot" for DT bindings
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. Acked-by: Michal Marek <mmarek@suse.cz> Acked-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
l---------arch/arm/boot/dts/include/dt-bindings1
-rw-r--r--scripts/Makefile.lib2
2 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm/boot/dts/include/dt-bindings b/arch/arm/boot/dts/include/dt-bindings
new file mode 120000
index 0000000..08c00e4
--- /dev/null
+++ b/arch/arm/boot/dts/include/dt-bindings
@@ -0,0 +1 @@
+../../../../../include/dt-bindings \ No newline at end of file
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 07125e6..af35521 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -158,7 +158,7 @@ ld_flags = $(LDFLAGS) $(ldflags-y)
dtc_cpp_flags = -Wp,-MD,$(depfile) -nostdinc \
-I$(srctree)/arch/$(SRCARCH)/boot/dts \
- -I$(srctree)/arch/$(SRCARCH)/include/dts \
+ -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \
-undef -D__DTS__
# Finds the multi-part object the current object will be linked into
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