From 9fe15b3b565e70238b2413f63c7b79de54fc2653 Mon Sep 17 00:00:00 2001
From: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Date: Tue, 24 Nov 2020 15:39:24 +0200
Subject: overlays: add makefile

Add the initial version of Makefile using
the reference solution from the commit
10a077204e0c ("overlays: add makefile using regular kbuild infrastructure")

Realted-to: ELB-3239
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
---
 overlays/Makefile | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 overlays/Makefile

diff --git a/overlays/Makefile b/overlays/Makefile
new file mode 100644
index 0000000..379dd65
--- /dev/null
+++ b/overlays/Makefile
@@ -0,0 +1,48 @@
+# your kernel sources
+STAGING_KERNEL_DIR ?= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)/source/
+
+# kernel output (if building out-of-tree)
+KBUILD_OUTPUT ?= $(STAGING_KERNEL_DIR)
+
+DTC_FLAGS := -@
+
+# we have dtbos in arm and arm64 architecture, set the include paths
+# to include both architectures.
+KERNEL_INCLUDE = " \
+    ${STAGING_KERNEL_DIR}/arch/arm/boot/dts/ \
+    ${STAGING_KERNEL_DIR}/arch/arm64/boot/dts/*/ \
+"
+
+DTS_INCLUDES := $(patsubst %,-I%,$(dir $(wildcard $(KERNEL_INCLUDE))))
+
+HOSTCC := gcc $(DTS_INCLUDES)
+
+PWD := $(shell pwd)
+
+dtb-y += apalis-imx6_adv7280_overlay.dtbo
+dtb-y += apalis-imx6_atmel-mxt_overlay.dtbo
+dtb-y += apalis-imx6_lvds_overlay.dtbo
+dtb-y += apalis-imx6_ov5640_overlay.dtbo
+dtb-y += apalis-imx6_ov5640_v11a_overlay.dtbo
+dtb-y += apalis-imx6_parallel-rgb_overlay.dtbo
+dtb-y += colibri-imx6-aster_atmel-mxt_overlay.dtbo
+dtb-y += colibri-imx6-eval_atmel-mxt_overlay.dtbo
+dtb-y += colibri-imx7-aster_atmel-mxt_overlay.dtbo
+dtb-y += colibri-imx7-eval_atmel-mxt_overlay.dtbo
+dtb-y += display-edt5.7_overlay.dtbo
+dtb-y += display-edt7_overlay.dtbo
+dtb-y += display-lt161010_overlay.dtbo
+dtb-y += display-lt170410_overlay.dtbo
+
+targets += $(dtb-y)
+always  := $(dtb-y)
+
+# adopted to dtbo from scripts/Makefile.lib
+$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
+	$(call if_changed_dep,dtc,dtb)
+
+all:
+	make -C $(KBUILD_OUTPUT) M=$(PWD)
+
+clean:
+	make -C $(KBUILD_OUTPUT) M=$(PWD) clean
-- 
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