--- zzzz-none-000/linux-4.9.276/arch/mips/boot/dts/cavium-octeon/Makefile	2021-07-20 14:21:16.000000000 +0000
+++ falcon-5530-750/linux-4.9.276/arch/mips/boot/dts/cavium-octeon/Makefile	2023-04-05 08:19:00.000000000 +0000
@@ -1,9 +1,3 @@
 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				:= $(dtb-y)
-clean-files			:= *.dtb *.dtb.S
+obj-$(CONFIG_BUILTIN_DTB)	+= $(addsuffix .o, $(dtb-y))