From 10a077204e0c8a9bc730870991091b182afd25d9 Mon Sep 17 00:00:00 2001
From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Date: Fri, 4 Sep 2020 21:27:15 +0200
Subject: overlays: add makefile using regular kbuild infrastructure

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
---
 overlays/Makefile | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 overlays/Makefile

diff --git a/overlays/Makefile b/overlays/Makefile
new file mode 100644
index 0000000..b7904eb
--- /dev/null
+++ b/overlays/Makefile
@@ -0,0 +1,59 @@
+# 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_atmel-mxt_overlay.dtbo
+dtb-y += apalis-imx6_disable-parallel-rgb_overlay.dtbo
+dtb-y += apalis-imx6_lvds_overlay.dtbo
+dtb-y += apalis-imx8qm_atmel-mxt_overlay.dtbo
+dtb-y += apalis-imx8qm_display-lt170410_overlay.dtbo
+dtb-y += apalis-imx8qm_st-m41t0_overlay.dtbo
+dtb-y += apalis-imx8x_ad7879_overlay.dtbo
+dtb-y += apalis-imx8x_atmel-mxt_overlay.dtbo
+dtb-y += apalis-imx8x_display-lt161010_overlay.dtbo
+dtb-y += apalis-imx8x_display-lt170410_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 += colibri-imx8x_ad7879_overlay.dtbo
+dtb-y += colibri-imx8x_atmel-mxt_overlay.dtbo
+dtb-y += colibri-imx8x_parallel-rgb_overlay.dtbo
+dtb-y += colibri-imx8x_display-lt170410_overlay.dtbo
+dtb-y += colibri-imx8x_dsihdmi_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
+dtb-y += verdin-imx8mm_lt8912_overlay.dtbo
+dtb-y += verdin-imx8mm_sn65dsi84_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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