xtensa: enable building of all dtbs

Enable building all dtb files when CONFIG_OF_ALL_DTBS is enabled. The dtbs
are not really dependent on a platform being enabled or any other kernel
config, so for testing coverage it is convenient to build all of the dtbs.
This builds all dts files in the tree, not just targets listed.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: linux-xtensa@linux-xtensa.org

2 files changed, 10 insertions, 1 deletions

diff --git a/arch/xtensa/Makefile b/arch/xtensa/Makefile
index f9e6a068aafd..709b5748a2d7 100644
--- a/arch/xtensa/Makefile
+++ b/arch/xtensa/Makefile
@@ -101,6 +101,10 @@ zImage: vmlinux
 %.dtb:
         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 
+dtbs: scripts
+        $(Q)$(MAKE) $(build)=$(boot)/dts
+
 define archhelp
   @echo '* zImage      - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'
+  @echo '  dtbs        - Build device tree blobs for enabled boards'
 endef
diff --git a/arch/xtensa/boot/dts/Makefile b/arch/xtensa/boot/dts/Makefile
index 5f711bba8307..a15e241c9153 100644
--- a/arch/xtensa/boot/dts/Makefile
+++ b/arch/xtensa/boot/dts/Makefile
@@ -12,4 +12,9 @@ ifneq ($(CONFIG_BUILTIN_DTB),"")
 obj-$(CONFIG_OF) += $(BUILTIN_DTB)
 endif
 
-clean-files := *.dtb.S
+dtstree := $(srctree)/$(src)
+dtb-$(CONFIG_OF_ALL_DTBS) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
+
+always += $(dtb-y)
+clean-files += *.dtb *.dtb.S
+