From 35f7ec4d72c97208e3326a4dce626c65481e8128 Mon Sep 17 00:00:00 2001
From: The-going <48602507+The-going@users.noreply.github.com>
Date: Tue, 1 Feb 2022 21:04:08 +0300
Subject: [PATCH] scripts: add overlay compilation support

---
 arch/arm/boot/.gitignore |  2 ++
 scripts/Makefile.dtbinst | 39 ++++++++++++++++++++++++++-------------
 scripts/Makefile.lib     | 21 +++++++++++++++++++--
 3 files changed, 47 insertions(+), 15 deletions(-)

diff --git a/arch/arm/boot/.gitignore b/arch/arm/boot/.gitignore
index 8c759326b..e6ce8f6ad 100644
--- a/arch/arm/boot/.gitignore
+++ b/arch/arm/boot/.gitignore
@@ -4,3 +4,5 @@ zImage
 xipImage
 bootpImage
 uImage
+*.dtb*
+*.scr
diff --git a/scripts/Makefile.dtbinst b/scripts/Makefile.dtbinst
index 190d781e8..d7d937903 100644
--- a/scripts/Makefile.dtbinst
+++ b/scripts/Makefile.dtbinst
@@ -13,27 +13,40 @@ src := $(obj)
 PHONY := __dtbs_install
 __dtbs_install:
 
+export dtbinst_root ?= $(obj)
+
 include include/config/auto.conf
 include $(srctree)/scripts/Kbuild.include
 include $(src)/Makefile
 
-dtbs    := $(addprefix $(dst)/, $(dtb-y) $(if $(CONFIG_OF_ALL_DTBS),$(dtb-)))
-subdirs := $(addprefix $(obj)/, $(subdir-y) $(subdir-m))
+dtbinst-files	:= $(sort $(dtb-y) $(if $(CONFIG_OF_ALL_DTBS), $(dtb-)))
+dtboinst-files	:= $(dtbo-y)
+script-files	:= $(scr-y)
+readme-files	:= $(dtbotxt-y)
+dtbinst-dirs	:= $(subdir-y) $(subdir-m)
+
+# Helper targets for Installing DTBs into the boot directory
+quiet_cmd_dtb_install =	INSTALL $<
+      cmd_dtb_install =	mkdir -p $(2); cp $< $(2)
+
+install-dir = $(patsubst $(dtbinst_root)%,$(INSTALL_DTBS_PATH)%,$(obj))
+
+$(dtbinst-files): %.dtb: $(obj)/%.dtb
+	$(call cmd,dtb_install,$(install-dir))
 
-__dtbs_install: $(dtbs) $(subdirs)
-	@:
+$(dtboinst-files): %.dtbo: $(obj)/%.dtbo
+	$(call cmd,dtb_install,$(install-dir))
 
-quiet_cmd_dtb_install = INSTALL $@
-      cmd_dtb_install = install -D $< $@
+$(script-files): %.scr: $(obj)/%.scr
+	$(call cmd,dtb_install,$(install-dir))
 
-$(dst)/%.dtb: $(obj)/%.dtb
-	$(call cmd,dtb_install)
+$(readme-files): %: $(src)/%
+	$(call cmd,dtb_install,$(install-dir))
 
-$(dst)/%.dtbo: $(obj)/%.dtbo
-	$(call cmd,dtb_install)
+$(dtbinst-dirs):
+	$(Q)$(MAKE) $(dtbinst)=$(obj)/$@
 
-PHONY += $(subdirs)
-$(subdirs):
-	$(Q)$(MAKE) $(dtbinst)=$@ dst=$(patsubst $(obj)/%,$(dst)/%,$@)
+PHONY += $(dtbinst-files) $(dtboinst-files) $(script-files) $(readme-files) $(dtbinst-dirs)
+__dtbs_install: $(dtbinst-files) $(dtboinst-files) $(script-files) $(readme-files) $(dtbinst-dirs)
 
 .PHONY: $(PHONY)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 3aa384cec..02b118ce7 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -336,6 +336,9 @@ quiet_cmd_gzip = GZIP    $@
 DTC ?= $(objtree)/scripts/dtc/dtc
 DTC_FLAGS += -Wno-interrupt_provider
 
+# Overlay support
+DTC_FLAGS += -@ -Wno-unit_address_format -Wno-simple_bus_reg
+
 # Disable noisy checks by default
 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
 DTC_FLAGS += -Wno-unit_address_vs_reg \
@@ -405,8 +408,22 @@ endif
 $(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
 	$(call if_changed_dep,dtb)
 
-$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE
-	$(call if_changed_dep,dtc)
+quiet_cmd_dtco = DTCO    $@
+cmd_dtco = mkdir -p $(dir ${dtc-tmp}) ; \
+	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
+	$(DTC) -O dtb -o $@ -b 0 \
+		-i $(dir $<) $(DTC_FLAGS) \
+		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
+	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
+
+$(obj)/%.dtbo: $(src)/%.dts FORCE
+	$(call if_changed_dep,dtco)
+
+quiet_cmd_scr = MKIMAGE $@
+cmd_scr = mkimage -C none -A $(ARCH) -T script -d $< $@
+
+$(obj)/%.scr: $(src)/%.scr-cmd FORCE
+	$(call if_changed,scr)
 
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 
-- 
2.35.3