pylibfdt: compile pylibfdt only when dtoc/binman is necessary

Currently, pylibfdt is always compiled if swig is installed on your
machine.  It is really annoying because most of targets (excepts
x86, sunxi, rockchip) do not use dtoc or binman.

"checkbinman" and "checkdtoc" are wrong.  It is odd that the final
build stage checks if we have built necessary tools.  If your platform
depends on dtoc/binman, you must be able to build pylibfdt.  If swig
is not installed, it should fail immediately.

I added PYLIBFDT, DTOC, BINMAN entries to Kconfig.  They should be
property select:ed by platforms that need them.  Kbuild will descend
into scripts/dtc/pylibfdt/ only when CONFIG_PYLIBFDT is enabled.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

Makefile

@@ -1135,7 +1135,7 @@ cmd_ldr = $(LD) $(LDFLAGS_$(@F)) \
 
 u-boot.rom: u-boot-x86-16bit.bin u-boot.bin \
 		$(if $(CONFIG_SPL_X86_16BIT_INIT),spl/u-boot-spl.bin) \
-		$(if $(CONFIG_HAVE_REFCODE),refcode.bin) checkbinman FORCE
+		$(if $(CONFIG_HAVE_REFCODE),refcode.bin) FORCE
 	$(call if_changed,binman)
 
 OBJCOPYFLAGS_u-boot-x86-16bit.bin := -O binary -j .start16 -j .resetvec
@@ -1144,8 +1144,7 @@ u-boot-x86-16bit.bin: u-boot FORCE
 endif
 
 ifneq ($(CONFIG_ARCH_SUNXI),)
-u-boot-sunxi-with-spl.bin: spl/sunxi-spl.bin u-boot.img u-boot.dtb \
-		checkbinman FORCE
+u-boot-sunxi-with-spl.bin: spl/sunxi-spl.bin u-boot.img u-boot.dtb FORCE
 	$(call if_changed,binman)
 endif
 
@@ -1379,18 +1378,6 @@ $(version_h): include/config/uboot.release FORCE
 $(timestamp_h): $(srctree)/Makefile FORCE
 	$(call filechk,timestamp.h)
 
-checkbinman: tools
-	@if ! ( echo 'import libfdt' | ( PYTHONPATH=scripts/dtc/pylibfdt $(PYTHON) )); then \
-		echo >&2; \
-		echo >&2 '*** binman needs the Python libfdt library.'; \
-		echo >&2 '*** Either install it on your system, or try:'; \
-		echo >&2 '***'; \
-		echo >&2 '*** sudo apt-get install swig libpython-dev'; \
-		echo >&2 '***'; \
-		echo >&2 '*** to have U-Boot build its own version.'; \
-		false; \
-	fi
-
 # ---------------------------------------------------------------------------
 quiet_cmd_cpp_lds = LDS     $@
 cmd_cpp_lds = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) \

arch/arm/Kconfig

@@ -675,6 +675,7 @@ config ARCH_SOCFPGA
 
 config ARCH_SUNXI
 	bool "Support sunxi (Allwinner) SoCs"
+	select BINMAN
 	select CMD_GPIO
 	select CMD_MMC if MMC
 	select CMD_USB if DISTRO_DEFAULTS

arch/x86/Kconfig

@@ -152,6 +152,7 @@ config SMM_TSEG_SIZE
 config X86_RESET_VECTOR
 	bool
 	default n
+	select BINMAN
 
 # The following options control where the 16-bit and 32-bit init lies
 # If SPL is enabled then it normally holds this init code, and U-Boot proper

dts/Kconfig

@@ -8,6 +8,17 @@ config SUPPORT_OF_CONTROL
 config DTC
 	bool
 
+config PYLIBFDT
+	bool
+
+config DTOC
+	bool
+	select PYLIBFDT
+
+config BINMAN
+	bool
+	select DTOC
+
 menu "Device Tree Control"
 	depends on SUPPORT_OF_CONTROL
 
@@ -231,6 +242,7 @@ config OF_SPL_REMOVE_PROPS
 config SPL_OF_PLATDATA
 	bool "Generate platform data for use in SPL"
 	depends on SPL_OF_CONTROL
+	select DTOC
 	help
 	  For very constrained SPL environments the overhead of decoding
 	  device tree nodes and converting their contents into platform data
@@ -252,6 +264,7 @@ config SPL_OF_PLATDATA
 config TPL_OF_PLATDATA
 	bool "Generate platform data for use in TPL"
 	depends on TPL_OF_CONTROL
+	select DTOC
 	help
 	  For very constrained SPL environments the overhead of decoding
 	  device tree nodes and converting their contents into platform data

scripts/Makefile.spl

@@ -276,10 +276,10 @@ PHONY += dts_dir
 dts_dir:
 	$(shell [ -d $(obj)/dts ] || mkdir -p $(obj)/dts)
 
-include/generated/dt-structs-gen.h: $(obj)/$(SPL_BIN).dtb dts_dir checkdtoc
+include/generated/dt-structs-gen.h: $(obj)/$(SPL_BIN).dtb dts_dir FORCE
 	$(call if_changed,dtoch)
 
-$(obj)/dts/dt-platdata.c: $(obj)/$(SPL_BIN).dtb dts_dir checkdtoc
+$(obj)/dts/dt-platdata.c: $(obj)/$(SPL_BIN).dtb dts_dir FORCE
 	$(call if_changed,dtocc)
 
 ifdef CONFIG_SAMSUNG
@@ -380,17 +380,6 @@ ifneq ($(cmd_files),)
   include $(cmd_files)
 endif
 
-checkdtoc: tools
-	@if ! ( echo 'import libfdt' | ( PYTHONPATH=scripts/dtc/pylibfdt $(PYTHON) )); then \
-		echo '*** dtoc needs the Python libfdt library. Either '; \
-		echo '*** install it on your system, or try:'; \
-		echo '***'; \
-		echo '*** sudo apt-get install swig libpython-dev'; \
-		echo '***'; \
-		echo '*** to have U-Boot build its own version.'; \
-		false; \
-	fi
-
 PHONY += FORCE
 FORCE:
 

scripts/dtc/Makefile

@@ -31,4 +31,4 @@ $(obj)/dtc-lexer.lex.o: $(obj)/dtc-parser.tab.h
 clean-files	:= dtc-lexer.lex.c dtc-parser.tab.c dtc-parser.tab.h
 
 # Added for U-Boot
-subdir-y += pylibfdt
+subdir-$(CONFIG_PYLIBFDT) += pylibfdt