[RFC PATCH v2 1/4] scripts: Add script to generate dtb build information

Alexandre Torgue
2020-02-21T16:14:42Z

This commit adds a new script to create a file (in dts file directory) with
some information (date, Linux version, user). This file could then be used
to populate "build-info" property in every dts file that would use this
build information:

Example:

/ {
...
build-info = /incbin/("dtb-build.txt");
...
};

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

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index bae62549e3d2..a5af84ef4ffc 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -246,6 +246,7 @@ quiet_cmd_gzip = GZIP $@
# DTC
# ---------------------------------------------------------------------------
DTC ?= $(objtree)/scripts/dtc/dtc
+DTB_GEN_INFO ?= $(objtree)/scripts/gen_dtb_build_info.sh

# Disable noisy checks by default
ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
@@ -286,6 +287,7 @@ $(obj)/%.dtb.S: $(obj)/%.dtb FORCE

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) $< ; \
$(DTC) -O $(2) -o $@ -b 0 \
$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
diff --git a/scripts/gen_dtb_build_info.sh b/scripts/gen_dtb_build_info.sh
new file mode 100755
index 000000000000..0cd8bd98e410
--- /dev/null
+++ b/scripts/gen_dtb_build_info.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+set -o nounset
+
+DTB_DIR=$1
+DTB_COMPILE_BY=$(whoami | sed 's/\\/\\\\/')
+DTB_INFO="From Linux $KERNELRELEASE by $DTB_COMPILE_BY the $(date).\0"
+
+printf "$DTB_INFO" > "$DTB_DIR/dtb-build.txt"
--
2.17.1