[PATCH v3 1/3] MIPS: Create common infrastructure for building built-in device-trees

[Andrew Bresticker <abrestic@chromium.org>]

In preparation for moving the device-trees to a common location,
introduce the config option BUILTIN_DTB, which can be selected by
platforms that use a device-tree built into the kernel image, and
create a Makefile to build the device-trees in arch/mips/boot/dts/.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
---
Changes from v2:
 - use $(dts-dirs) for descending into vendor subdirs
No changes from v1.
---
 arch/mips/Kconfig           | 3 +++
 arch/mips/Makefile          | 6 ++++++
 arch/mips/boot/dts/Makefile | 4 ++++
 3 files changed, 13 insertions(+)
 create mode 100644 arch/mips/boot/dts/Makefile

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 900c7e5..ffa8388 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2479,6 +2479,9 @@ config USE_OF
 	select OF_EARLY_FLATTREE
 	select IRQ_DOMAIN
 
+config BUILTIN_DTB
+	bool
+
 endmenu
 
 config LOCKDEP_SUPPORT
diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 9336509..72cdd6a 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -324,6 +324,12 @@ endif
 
 CLEAN_FILES += vmlinux.32 vmlinux.64
 
+# device-trees
+core-$(CONFIG_BUILTIN_DTB) += arch/mips/boot/dts/
+
+%.dtb %.dtb.S %.dtb.o: | scripts
+	$(Q)$(MAKE) $(build)=arch/mips/boot/dts arch/mips/boot/dts/$@
+
 archprepare:
 ifdef CONFIG_MIPS32_N32
 	@echo '  Checking missing-syscalls for N32'
diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
new file mode 100644
index 0000000..4a78bad
--- /dev/null
+++ b/arch/mips/boot/dts/Makefile
@@ -0,0 +1,4 @@
+obj-y		+= $(addsuffix /, $(dts-dirs))
+
+subdir-y	:= $(dts-dirs)
+clean-files	:= *.dtb *.dtb.S
-- 
2.1.0.rc2.206.gedb03e5