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kbuild: centralize .dts->.dtb rule

All architectures that use cmd_dtc do so in almost the same way. Create
a central build rule to avoid duplication. The one difference is that
most current uses of dtc build $(obj)/%.dtb from $(src)/dts/%.dts rather
than building the .dtb in the same directory as the .dts file. This
difference will be eliminated arch-by-arch in future patches.

MIPS is the exception here; it already uses the exact same rule as the
new common rule, so the duplicate is removed in this patch to avoid any
conflict. arch/mips changes courtesy of Ralf Baechle.

Update Documentation/kbuild to remove the explicit call to cmd_dtc from
the example, now that the rule exists in a centralized location.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Olof Johansson <olof@lixom.net>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: linux@lists.openrisc.net
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: linux-c6x-dev@linux-c6x.org
Cc: Mark Salter <msalter@redhat.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: microblaze-uclinux@itee.uq.edu.au
Cc: Chris Zankel <chris@zankel.net>
Cc: linux-xtensa@linux-xtensa.org
Cc: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This commit is contained in:
Stephen Warren 2012-11-27 16:29:10 -07:00 committed by Rob Herring
parent 4a92a385f8
commit 90b335fbbc
5 changed files with 12 additions and 17 deletions

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@ -1175,15 +1175,16 @@ When kbuild executes, the following steps are followed (roughly):
in an init section in the image. Platform code *must* copy the
blob to non-init memory prior to calling unflatten_device_tree().
To use this command, simply add *.dtb into obj-y or targets, or make
some other target depend on %.dtb
A central rule exists to create $(obj)/%.dtb from $(src)/%.dts;
architecture Makefiles do no need to explicitly write out that rule.
Example:
#arch/x86/platform/ce4100/Makefile
clean-files := *dtb.S
DTC_FLAGS := -p 1024
obj-y += foo.dtb.o
$(obj)/%.dtb: $(src)/%.dts
$(call cmd,dtc)
targets += $(dtb-y)
clean-files += *.dtb
DTC_FLAGS ?= -p 1024
--- 6.8 Custom kbuild commands

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@ -24,9 +24,6 @@ DTB_FILES = $(patsubst %.dts, %.dtb, $(DTS_FILES))
obj-y += $(patsubst %.dts, %.dtb.o, $(DTS_FILES))
$(obj)/%.dtb: $(src)/%.dts FORCE
$(call if_changed_dep,dtc)
# Let's keep the .dtb files around in case we want to look at them.
.SECONDARY: $(addprefix $(obj)/, $(DTB_FILES))

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@ -1,4 +1 @@
obj-$(CONFIG_DT_EASY50712) := easy50712.dtb.o
$(obj)/%.dtb: $(obj)/%.dts
$(call if_changed,dtc)

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@ -1,4 +1 @@
obj-$(CONFIG_DT_XLP_EVP) := xlp_evp.dtb.o
$(obj)/%.dtb: $(obj)/%.dts
$(call if_changed,dtc)

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@ -266,6 +266,9 @@ $(obj)/%.dtb.S: $(obj)/%.dtb
quiet_cmd_dtc = DTC $@
cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $<
$(obj)/%.dtb: $(src)/%.dts FORCE
$(call if_changed_dep,dtc)
# Bzip2
# ---------------------------------------------------------------------------