[RFC PATCH] arm/arm64: build all dtbs for CONPILE_TEST

[Rob Herring]

Enable building all dtb files when COMPILE_TEST 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. This
is simpler for arm64 which has a bunch of sub-dirs.

Signed-off-by: Rob Herring <robh at kernel.org>
Cc: Russell King <linux at arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will.deacon at arm.com>
---
I've had this on my todo list for a while. RFC for now as I want to do 
the rest of the arches as well. I was originally thinking a new target 
for this, but thanks to Olof for the COMPILE_TEST suggestion. 

Rob

 arch/arm/boot/dts/Makefile   | 4 ++++
 arch/arm64/boot/dts/Makefile | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 246473a..4968442a 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -712,5 +712,9 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += \
 dtb-$(CONFIG_ARCH_ZX) += zx296702-ad1.dtb
 endif
 
+dtstree		:= $(srctree)/$(src)
+
+dtb-$(CONFIG_COMPILE_TEST) := $(patsubst $(dtstree)/%.dts,%.dtb, $(wildcard $(dtstree)/*.dts))
+
 always		:= $(dtb-y)
 clean-files	:= *.dtb
diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
index 38913be..9f19390 100644
--- a/arch/arm64/boot/dts/Makefile
+++ b/arch/arm64/boot/dts/Makefile
@@ -11,3 +11,9 @@ dts-dirs += sprd
 dts-dirs += xilinx
 
 subdir-y	:= $(dts-dirs)
+
+dtstree		:= $(srctree)/$(src)
+
+dtb-$(CONFIG_COMPILE_TEST) := $(patsubst $(dtstree)/%.dts,%.dtb, $(foreach d,$(dts-dirs), $(wildcard $(dtstree)/$(d)/*.dts)))
+
+always		:= $(dtb-y)
-- 
2.1.4