arch/mips/boot/dts/cavium-octeon/Makefile - kernel/lockdown - Git at Google

 dtb-$(CONFIG_CAVIUM_OCTEON_SOC)	+= octeon_3xxx.dtb octeon_68xx.dtb

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

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

 always				:= $(dtb-y)
 clean-files			:= *.dtb *.dtb.S
	dtb-$(CONFIG_CAVIUM_OCTEON_SOC) += octeon_3xxx.dtb octeon_68xx.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