[U-Boot] [PATCH v4 09/11] binman: Automatically include a U-Boot .dtsi file

[Simon Glass]

For boards that need U-Boot-specific additions to the device tree, it is
a minor annoyance to have to add these each time the tree is synced with
upstream.

Add a means to include a file (e.g. u-boot.dtsi) automatically into the .dts
file before it is compiled.

The file uses is the first one that exists in this list:

   arch/<arch>/dts/<board.dts>-u-boot.dtsi
   arch/<arch>/dts/<soc>-u-boot.dtsi
   arch/<arch>/dts/<cpu>-u-boot.dtsi
   arch/<arch>/dts/<vendor>-u-boot.dtsi
   arch/<arch>/dts/u-boot.dtsi

Signed-off-by: Simon Glass <sjg at chromium.org>
Suggested-by: Tom Rini <trini at konsulko.com>
---

Changes in v4:
- Add an option to bring in an soc .dtsi file also
- Fix up rule to #include on "/ {" rather than "/dts-v1/;"
- Rename binman_dtsi variable to u-boot-dtsi

Changes in v3:
- Add a new patch to automatically include a U-Boot .dtsi file

Changes in v2: None

 scripts/Makefile.lib | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 2539ba5..f6d7d34 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -164,6 +164,18 @@ cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE)     \
 
 ld_flags       = $(LDFLAGS) $(ldflags-y)
 
+dts_dir = $(srctree)/arch/$(ARCH)/dts
+
+# Try these files in order to find the U-Boot-specific .dtsi include file
+u-boot-dtsi_options = $(wildcard $(dts_dir)/$(basename $(notdir $<))-u-boot.dtsi) \
+	$(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_SOC))-u-boot.dtsi) \
+	$(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_CPU))-u-boot.dtsi) \
+	$(wildcard $(dts_dir)/$(subst $\",,$(CONFIG_SYS_VENDOR))-u-boot.dtsi) \
+	$(wildcard $(dts_dir)/u-boot.dtsi)
+
+# We use the first match
+u-boot-dtsi = $(firstword $(u-boot-dtsi_options))
+
 # Modified for U-Boot
 dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
 		 -I$(srctree)/arch/$(ARCH)/dts                           \
@@ -293,8 +305,11 @@ $(obj)/%.dtb.S: $(obj)/%.dtb
 
 quiet_cmd_dtc = DTC     $@
 # Modified for U-Boot
+# Bring in any U-Boot-specific include after the '/dts-v1/;' header
 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
-	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
+	cat $< $(if $(u-boot-dtsi),\
+		| sed 's%^/ {$$%\#include \"$(u-boot-dtsi)\"\n&%')  | \
+		$(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) ; \
-- 
2.8.0.rc3.226.g39d4020