MIPS: Add support for building device-tree binaries

Add a 'dtbs' Makefile target that just builds the device-tree binaries
enabled by the configuration.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Kumar Gala <galak@codeaurora.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: David Daney <david.daney@cavium.com>
Cc: John Crispin <blogic@openwrt.org>
Cc: Jayachandran C <jchandra@broadcom.com>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7557/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 12 insertions, 1 deletions

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index bd642623f360..23cb94806fbc 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -339,6 +339,10 @@ core-$(CONFIG_BUILTIN_DTB) += arch/mips/boot/dts/
 %.dtb %.dtb.S %.dtb.o: | scripts
         $(Q)$(MAKE) $(build)=arch/mips/boot/dts arch/mips/boot/dts/$@
 
+PHONY += dtbs
+dtbs: scripts
+        $(Q)$(MAKE) $(build)=arch/mips/boot/dts dtbs
+
 archprepare:
 ifdef CONFIG_MIPS32_N32
         @echo '  Checking missing-syscalls for N32'
@@ -373,6 +377,7 @@ define archhelp
         echo '  vmlinuz.srec         - SREC zboot image'
         echo '  uImage               - U-Boot image'
         echo '  uImage.gz            - U-Boot image (gzip)'
+        echo '  dtbs                 - Device-tree blobs for enabled boards'
         echo
         echo '  These will be default as appropriate for a configured platform.'
 endef
diff --git a/arch/mips/boot/.gitignore b/arch/mips/boot/.gitignore
index a73d6e2c4f64..d3962cd5ce0c 100644
--- a/arch/mips/boot/.gitignore
+++ b/arch/mips/boot/.gitignore
@@ -5,3 +5,4 @@ zImage
 zImage.tmp
 calc_vmlinuz_load_addr
 uImage
+*.dtb
diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
index 6bb41df59264..9b3da1f4bc6d 100644
--- a/arch/mips/boot/dts/Makefile
+++ b/arch/mips/boot/dts/Makefile
@@ -1,3 +1,8 @@
 obj-y           += $(patsubst %.dtb, %.dtb.o, $(dtb-y))
 
-clean-files     += *.dtb.S
+targets         += dtbs
+targets         += $(dtb-y)
+
+dtbs: $(addprefix $(obj)/, $(dtb-y))
+
+clean-files     += *.dtb *.dtb.S