kbuild: add misc targets, help, ubootrelease, ubootversion

"help" target has been copied from Linux 3.13 and adjusted
for U-Boot.
Unlike Linux, cleaning is done on 4 levels:
clean, clobber, mrproper, distclean.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>

Makefile

@@ -415,7 +415,7 @@ timestamp_h := include/generated/timestamp_autogenerated.h
 
 no-dot-config-targets := clean clobber mrproper distclean \
 			 help %docs check% coccicheck \
-			 backup
+			 ubootversion backup
 
 config-targets := 0
 mixed-targets  := 0
@@ -1081,12 +1081,6 @@ TAG_SUBDIRS := $(u-boot-dirs) include
 FIND := find
 FINDFLAGS := -L
 
-PHONY += checkstack
-
-checkstack:
-	$(OBJDUMP) -d u-boot $$(find . -name u-boot-spl) | \
-	$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
-
 tags ctags:
 		ctags -w -o ctags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
 						-name '*.[chS]' -print`
@@ -1252,6 +1246,51 @@ backup:
 	F=`basename $(TOPDIR)` ; cd .. ; \
 	gtar --force-local -zcvf `LC_ALL=C date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F
 
+help:
+	@echo  'Cleaning targets:'
+	@echo  '  clean		  - Remove most generated files but keep the config and'
+	@echo  '                    necessities for testing u-boot'
+	@echo  '  clobber	  - Remove most generated files but keep the config'
+	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
+	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
+	@echo  ''
+# uncomment after adding Kconfig feature
+#	@echo  'Configuration targets:'
+#	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
+#	@echo  ''
+	@echo  'Other generic targets:'
+	@echo  '  all		  - Build all necessary images depending on configuration'
+	@echo  '  u-boot	  - Build the bare u-boot'
+	@echo  '  dir/            - Build all files in dir and below'
+	@echo  '  dir/file.[oisS] - Build specified target only'
+	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
+	@echo  '                    (requires a recent binutils and recent build (System.map))'
+	@echo  '  tags/TAGS	  - Generate tags file for editors'
+	@echo  '  cscope	  - Generate cscope index'
+	@echo  '  ubootrelease	  - Output the release version string'
+	@echo  '  ubootversion	  - Output the version stored in Makefile'
+	@echo  ''
+	@echo  'Static analysers'
+	@echo  '  checkstack      - Generate a list of stack hogs'
+	@echo  ''
+	@echo  'Documentation targets:'
+	@$(MAKE) -f $(srctree)/doc/DocBook/Makefile dochelp
+	@echo  ''
+	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
+	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
+	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
+	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
+	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
+	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
+	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
+	@echo  '		1: warnings which may be relevant and do not occur too often'
+	@echo  '		2: warnings which occur quite often but may still be relevant'
+	@echo  '		3: more obscure warnings, can most likely be ignored'
+	@echo  '		Multiple levels can be combined with W=12 or W=123'
+	@echo  ''
+	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
+	@echo  'For further info see the ./README file'
+
 
 # Documentation targets
 # ---------------------------------------------------------------------------
@@ -1267,6 +1306,18 @@ scripts: ;
 endif #ifeq ($(config-targets),1)
 endif #ifeq ($(mixed-targets),1)
 
+PHONY += checkstack ubootrelease ubootversion
+
+checkstack:
+	$(OBJDUMP) -d u-boot $$(find . -name u-boot-spl) | \
+	$(PERL) $(src)/scripts/checkstack.pl $(ARCH)
+
+ubootrelease:
+	@echo "$(UBOOTVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
+
+ubootversion:
+	@echo $(UBOOTVERSION)
+
 # Single targets
 # ---------------------------------------------------------------------------
 # Single targets are compatible with: