[OpenWrt-Devel] [PATCH] Add support for C-style in dtsi files

[Nikolay Martynov]

Current way of compuling dts files involves calling C preprocessor on
main dts file only. This means that dtsi includes cannot have C-style includes.

This patch addresses this problem. It uses approach similar to one
use in linux kernel: it preprocesses all dtsi's in current dir into
tmp dir and then uses that tmp dir as include dir for main dts compilation.

Note: this patch preprocesses onlt *.dtsi, not *.dts, so only *.dtsi
can be includes, but it looks like all current architectures follow this convention.

This approach should be compatible with all current architectures.

This patch also updates ramips arch to use new dtsi comilation code.

Signed-off-by: Nikolay Martynov <mar.kolya at gmail.com>
---
 include/image.mk                   | 22 +++++++++++++++++-----
 target/linux/ramips/image/Makefile |  2 +-
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/include/image.mk b/include/image.mk
index fd5e3f4..7ce1dc5 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -138,19 +138,31 @@ define Image/BuildKernel/MkFIT
 endef
 
 # $(1) source dts file
-# $(2) target dtb file
+# $(2) target dts file
 # $(3) extra CPP flags
-# $(4) extra DTC flags
-define Image/BuildDTB
+define Image/PreprocessDTS
 	$(CPP) -nostdinc -x assembler-with-cpp \
 		-I$(LINUX_DIR)/arch/$(ARCH)/boot/dts \
 		-I$(LINUX_DIR)/arch/$(ARCH)/boot/dts/include \
 		-undef -D__DTS__ $(3) \
-		-o $(2).tmp $(1)
+		-o $(2) $(1);
+endef
+
+
+# $(1) source dts file
+# $(2) target dtb file
+# $(3) extra CPP flags
+# $(4) extra DTC flags
+define Image/BuildDTB
+	mkdir -p $(2).inc.tmp
+	$(foreach inc,$(wildcard $(dir $(1))*.dtsi), \
+		$(call Image/PreprocessDTS,$(inc),$(2).inc.tmp/$(notdir $(inc)),$(3)))
+	$(call Image/PreprocessDTS,$(1),$(2).tmp,$(3))
 	$(LINUX_DIR)/scripts/dtc/dtc -O dtb \
-		-i$(dir $(1)) $(4) \
+		-i$(2).inc.tmp $(4) \
 		-o $(2) $(2).tmp
 	$(RM) $(2).tmp
+	$(RM) -rf $(2).inc.tmp
 endef
 
 define Image/mkfs/jffs2/sub
diff --git a/target/linux/ramips/image/Makefile b/target/linux/ramips/image/Makefile
index e58d012..00a2923 100644
--- a/target/linux/ramips/image/Makefile
+++ b/target/linux/ramips/image/Makefile
@@ -39,7 +39,7 @@ define Device/Default
 endef
 
 define Build/patch-dtb
-	$(LINUX_DIR)/scripts/dtc/dtc -O dtb -o $@.dtb ../dts/$(DTS).dts
+	$(call Image/BuildDTB,../dts/$(DTS).dts,$@.dtb,-I$(LINUX_DIR)/arch/mips/boot/dts -I$(LINUX_DIR)/arch/mips/boot/dts/include)
 	$(STAGING_DIR_HOST)/bin/patch-dtb $@ $@.dtb
 endef
 
-- 
2.6.3
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