# SPDX-License-Identifier: GPL-2.0+

  #
  # Copyright (c) 2011 The Chromium OS Authors.

  
  # This Makefile builds the internal U-Boot fdt if CONFIG_OF_CONTROL is
  # enabled. See doc/README.fdt-control for more details.

  DEVICE_TREE ?= $(CONFIG_DEFAULT_DEVICE_TREE:"%"=%)
  ifeq ($(DEVICE_TREE),)

  DEVICE_TREE := unset

  endif

  ifneq ($(EXT_DTB),)
  DTB := $(EXT_DTB)

  else

  DTB := arch/$(ARCH)/dts/$(DEVICE_TREE).dtb

  endif

  $(obj)/dt-spl.dtb: $(DTB) $(objtree)/tools/fdtgrep FORCE
  	$(call if_changed,fdtgrep)

  $(obj)/dt.dtb: $(DTB) FORCE

  	$(call if_changed,shipped)

  targets += dt.dtb dt-spl.dtb

  $(DTB): arch-dtbs

  	$(Q)test -e $@ || (						\
  	echo >&2;							\
  	echo >&2 "Device Tree Source is not correctly specified.";	\
  	echo >&2 "Please define 'CONFIG_DEFAULT_DEVICE_TREE'";		\
  	echo >&2 "or build with 'DEVICE_TREE=<device_tree>' argument";	\
  	echo >&2;							\
  	/bin/false)

  PHONY += arch-dtbs

  arch-dtbs:

  	$(Q)$(MAKE) $(build)=arch/$(ARCH)/dts dtbs

  ifeq ($(CONFIG_SPL_BUILD),y)
  obj-$(CONFIG_OF_EMBED) := dt-spl.dtb.o
  # support "out-of-tree" build for dtb-spl
  $(obj)/dt-spl.dtb.o: $(obj)/dt-spl.dtb.S FORCE
  	$(call if_changed_dep,as_o_S)
  else

  obj-$(CONFIG_OF_EMBED) := dt.dtb.o

  endif

  dtbs: $(obj)/dt.dtb $(obj)/dt-spl.dtb

  	@:

  clean-files := dt.dtb.S dt-spl.dtb.S

  
  # Let clean descend into dts directories

  subdir- += ../arch/arm/dts ../arch/microblaze/dts ../arch/mips/dts ../arch/sandbox/dts ../arch/x86/dts ../arch/powerpc/dts ../arch/riscv/dts