dts, kbuild: Factor out dtbs install rules to Makefile.dtbinst

Move dtbs install rules to Makefile.dtbinst. This change is needed to
implement support for dts vendor subdirs. The change makes Makefiles
easier and smaller as no longer the dtbs_install rule needs to be
defined. Another advantage is that install goals are not encoded in
targets anymore (%.dtb_dtbinst_).
Signed-off-by: Robert Richter <rrichter@cavium.com>

arch/arm/Makefile

@@ -312,9 +312,13 @@ $(INSTALL_TARGETS):
 	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $(boot)/dts/$@
 
 PHONY += dtbs dtbs_install
-dtbs dtbs_install: prepare scripts
+
+dtbs: prepare scripts
 	$(Q)$(MAKE) $(build)=$(boot)/dts MACHINE=$(MACHINE) $@
 
+dtbs_install:
+	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts MACHINE=$(MACHINE)
+
 # We use MRPROPER_FILES and CLEAN_FILES now
 archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)

arch/arm/boot/dts/Makefile

@@ -527,5 +527,3 @@ dtbs: $(addprefix $(obj)/, $(dtb-y))
 	$(Q)rm -f $(obj)/../*.dtb
 
 clean-files := *.dtb
-
-dtbs_install: $(addsuffix _dtbinst_, $(dtb-y))

arch/arm64/Makefile

@@ -71,9 +71,13 @@ zinstall install: vmlinux
 	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 
 PHONY += dtbs dtbs_install
-dtbs dtbs_install: prepare scripts
+
+dtbs: prepare scripts
 	$(Q)$(MAKE) $(build)=$(boot)/dts $@
 
+dtbs_install:
+	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts
+
 PHONY += vdso_install
 vdso_install:
 	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@

arch/arm64/boot/dts/Makefile

@@ -8,5 +8,3 @@ targets += $(dtb-y)
 dtbs: $(addprefix $(obj)/, $(dtb-y))
 
 clean-files := *.dtb
-
-dtbs_install: $(addsuffix _dtbinst_, $(dtb-y))

scripts/Kbuild.include

@@ -179,6 +179,12 @@ build := -f $(srctree)/scripts/Makefile.build obj
 # $(Q)$(MAKE) $(modbuiltin)=dir
 modbuiltin := -f $(srctree)/scripts/Makefile.modbuiltin obj
 
+###
+# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.dtbinst obj=
+# Usage:
+# $(Q)$(MAKE) $(dtbinst)=dir
+dtbinst := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.dtbinst obj
+
 # Prefix -I with $(srctree) if it is not an absolute path.
 # skip if -I has no parameter
 addtree = $(if $(patsubst -I%,%,$(1)), \

scripts/Makefile.dtbinst

+# ==========================================================================
+# Installing dtb files
+#
+# Installs all dtb files listed in $(dtb-y) either in the
+# INSTALL_DTBS_PATH directory or the default location:
+#
+#   $INSTALL_PATH/dtbs/$KERNELRELEASE
+#
+# ==========================================================================
+
+src := $(obj)
+
+PHONY := __dtbs_install
+__dtbs_install:
+
+include include/config/auto.conf
+include scripts/Kbuild.include
+include $(srctree)/$(obj)/Makefile
+
+PHONY += __dtbs_install_prep
+__dtbs_install_prep:
+	$(Q)if [ -d $(INSTALL_DTBS_PATH).old ]; then rm -rf $(INSTALL_DTBS_PATH).old; fi
+	$(Q)if [ -d $(INSTALL_DTBS_PATH) ]; then mv $(INSTALL_DTBS_PATH) $(INSTALL_DTBS_PATH).old; fi
+	$(Q)mkdir -p $(INSTALL_DTBS_PATH)
+
+dtbinst-files	:= $(dtb-y)
+
+# Helper targets for Installing DTBs into the boot directory
+quiet_cmd_dtb_install =	INSTALL $<
+      cmd_dtb_install =	cp $< $(2)
+
+$(dtbinst-files): %.dtb: $(obj)/%.dtb | __dtbs_install_prep
+	$(call cmd,dtb_install,$(INSTALL_DTBS_PATH))
+
+PHONY += $(dtbinst-files)
+__dtbs_install: $(dtbinst-files)
+
+.PHONY: $(PHONY)

scripts/Makefile.lib

@@ -283,18 +283,6 @@ $(obj)/%.dtb: $(src)/%.dts FORCE
 
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
 
-# Helper targets for Installing DTBs into the boot directory
-quiet_cmd_dtb_install =	INSTALL $<
-      cmd_dtb_install =	cp $< $(2)
-
-_dtbinst_pre_:
-	$(Q)if [ -d $(INSTALL_DTBS_PATH).old ]; then rm -rf $(INSTALL_DTBS_PATH).old; fi
-	$(Q)if [ -d $(INSTALL_DTBS_PATH) ]; then mv $(INSTALL_DTBS_PATH) $(INSTALL_DTBS_PATH).old; fi
-	$(Q)mkdir -p $(INSTALL_DTBS_PATH)
-
-%.dtb_dtbinst_: $(obj)/%.dtb _dtbinst_pre_
-	$(call cmd,dtb_install,$(INSTALL_DTBS_PATH))
-
 # Bzip2
 # ---------------------------------------------------------------------------