arch/mips/boot/dts/xilfpga/Makefile - arm/linux - Git at Google

 # SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_XILFPGA_NEXYS4DDR)	+= nexys4ddr.dtb

 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))

 # Force kbuild to make empty built-in.o if necessary
 obj-				+= dummy.o

 always				:= $(dtb-y)
 clean-files	:= *.dtb *.dtb.S
	# SPDX-License-Identifier: GPL-2.0
	dtb-$(CONFIG_XILFPGA_NEXYS4DDR) += nexys4ddr.dtb

	obj-y += $(patsubst %.dtb, %.dtb.o, $(dtb-y))

	# Force kbuild to make empty built-in.o if necessary
	obj- += dummy.o

	always := $(dtb-y)
	clean-files := .dtb .dtb.S