diff --git a/Makefile b/Makefile
index b8f34f642fa8cf77ac2441978157887dbe69088d..f0f4788be30cd4f51017d807ad2d607110b1bd05 100644
--- a/Makefile
+++ b/Makefile
@@ -1835,7 +1835,7 @@ clean: $(clean-dirs)
 	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
 		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
 		-o -name '*.ko.*' \
-		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
+		-o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
 		-o -name '*.dwo' -o -name '*.lst' \
 		-o -name '*.su' -o -name '*.mod' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index 0e8cf4e371cd61d42c53c7e9b1afb8637e70368b..7cb6ddbf76879ce98da5b95e162e77641cffc175 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -1490,3 +1490,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-bmc-opp-zaius.dtb \
 	aspeed-bmc-portwell-neptune.dtb \
 	aspeed-bmc-quanta-q71l.dtb
+
+
+dts-dirs        += seco
+subdir-y        := $(dts-dirs)
diff --git a/arch/arm/boot/dts/seco/Makefile b/arch/arm/boot/dts/seco/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..66f9d101960966cd28b2a20cce6ae81a5b230024
--- /dev/null
+++ b/arch/arm/boot/dts/seco/Makefile
@@ -0,0 +1,3 @@
+#
+# SECO Makefile
+#