linux-kernel - [RFC PATCH v2 4/4] script: make automatic dtb build info generation

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Date:   Fri, 21 Feb 2020 17:12:17 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     <robh+dt@...nel.org>, Frank Rowand <frowand.list@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        <david@...son.dropbear.id.au>, <sjg@...omium.org>
CC:     <devicetree@...r.kernel.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <linux-kernel@...r.kernel.org>, <linux-kbuild@...r.kernel.org>,
        <devicetree-compiler@...r.kernel.org>, Ian Lepore <ian@...ebsd.org>
Subject: [RFC PATCH v2 4/4] script: make automatic dtb build info generation

Append each "xxx.dtb.dts.tmp" file with "build-info" entry during dtb
build. It allows to get build information (date, source version, ...)
for each device tree without modify them manually.

Signed-off-by: Alexandre Torgue <alexandre.torgue@...com>

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index a5af84ef4ffc..f084e78267b2 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -289,6 +289,7 @@ quiet_cmd_dtc = DTC     $@
 cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
 	$(DTB_GEN_INFO) $(src) ; \
 	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
+	$(DTB_GEN_INFO) $(src) $(dtc-tmp) ; \
 	$(DTC) -O $(2) -o $@ -b 0 \
 		$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
diff --git a/scripts/gen_dtb_build_info.sh b/scripts/gen_dtb_build_info.sh
index 0cd8bd98e410..72f31e386787 100755
--- a/scripts/gen_dtb_build_info.sh
+++ b/scripts/gen_dtb_build_info.sh
@@ -6,5 +6,7 @@ set -o nounset
 DTB_DIR=$1
 DTB_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
 DTB_INFO="From Linux $KERNELRELEASE by $DTB_COMPILE_BY the $(date).\0"
+DTS_FILE=$2
 
-printf "$DTB_INFO" > "$DTB_DIR/dtb-build.txt"
+printf "$DTB_INFO" > "arch/arm/boot/dts/dtb-build.txt"
+echo "&{/} {build-info = /incbin/(\"dtb-build.txt\");};" >> $DTS_FILE
-- 
2.17.1