[RESEND PATCHv2 2/4] ARM: dts: add support for individual build flags for DT subdirs
From: Frank Rowand <hidden>
Date: 2018-09-05 20:36:31
Also in:
linux-devicetree
On 09/04/18 01:05, Tero Kristo wrote:
quoted hunk ↗ jump to hunk
Currently the makefile is setup in such manner that even if we build a DT file in a subdirectory under arch/arm/boot/dts, it gets built based on the base boot/dts/Makefile rules. This patch modifies the base makefile in such manner, that it detects which makefile to use based on build target path. This allows setting for example per-directory DTC_FLAGS and using those for the subdir build. The dtbdir local variable is setup to target to the build path. Signed-off-by: Tero Kristo <redacted> --- arch/arm/Makefile | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)diff --git a/arch/arm/Makefile b/arch/arm/Makefile index ab555a0..b7c21e8 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile@@ -339,8 +339,10 @@ $(BOOT_TARGETS): vmlinux $(INSTALL_TARGETS): $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@ +%.dtb %.dtbo: dtbdir = $(patsubst %/,%,$(patsubst %./,%,$(boot)/dts/$(dir $@))) + %.dtb %.dtbo: | scripts - $(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $(boot)/dts/$@ + $(Q)$(MAKE) $(build)=$(dtbdir) MACHINE=$(MACHINE) $(boot)/dts/$@ PHONY += dtbs dtbs_install
The makefile magic to handle subdirectories below $(boot)/dts/ already
works properly to have Makefiles in $(boot)/dts/, using the following
rule in arch/arm64/Makefile:
%.dtb: scripts
$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
I don't understand why that works for arm64, but it should work the
same way for arm. Or if arch/arm is missing another piece from
arch/arm64 we should be consistent with however the make system
specifies it in arch/arm64