dts, kbuild: Implement support for dtb vendor subdirs

dtb-$(CONFIG_ARCH_XGENE) += apm-mustang.dtb

always		:= $(dtb-y)

subdir-y	:= $(dts-dirs)

clean-files	:= *.dtb

#

#   $INSTALL_PATH/dtbs/$KERNELRELEASE

#

# Traverse through subdirectories listed in $(dts-dirs).

# ==========================================================================

src := $(obj)

PHONY := __dtbs_install

__dtbs_install:

export dtbinst-root ?= $(obj)

include include/config/auto.conf

include scripts/Kbuild.include

include $(srctree)/$(obj)/Makefile

PHONY += __dtbs_install_prep

__dtbs_install_prep:

ifeq ("$(dtbinst-root)", "$(obj)")

	$(Q)if [ -d $(INSTALL_DTBS_PATH).old ]; then rm -rf $(INSTALL_DTBS_PATH).old; fi

	$(Q)if [ -d $(INSTALL_DTBS_PATH) ]; then mv $(INSTALL_DTBS_PATH) $(INSTALL_DTBS_PATH).old; fi

	$(Q)mkdir -p $(INSTALL_DTBS_PATH)

endif

dtbinst-files	:= $(dtb-y)

dtbinst-dirs	:= $(dts-dirs)

# Helper targets for Installing DTBs into the boot directory

quiet_cmd_dtb_install =	INSTALL $<

      cmd_dtb_install =	cp $< $(2)

      cmd_dtb_install =	mkdir -p $(2); cp $< $(2)

install-dir = $(patsubst $(dtbinst-root)%,$(INSTALL_DTBS_PATH)%,$(obj))

$(dtbinst-files) $(dtbinst-dirs): | __dtbs_install_prep

$(dtbinst-files): %.dtb: $(obj)/%.dtb

	$(call cmd,dtb_install,$(install-dir))

$(dtbinst-files): %.dtb: $(obj)/%.dtb | __dtbs_install_prep

	$(call cmd,dtb_install,$(INSTALL_DTBS_PATH))

$(dtbinst-dirs):

	$(Q)$(MAKE) $(dtbinst)=$(obj)/$@

PHONY += $(dtbinst-files)

__dtbs_install: $(dtbinst-files)

PHONY += $(dtbinst-files) $(dtbinst-dirs)

__dtbs_install: $(dtbinst-files) $(dtbinst-dirs)

.PHONY: $(PHONY)