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

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Date:   Fri, 21 Feb 2020 11:59:20 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Alexandre Torgue <alexandre.torgue@...com>, robh+dt@...nel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        david@...son.dropbear.id.au, sjg@...omium.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, devicetree-compiler@...r.kernel.org,
        Ian Lepore <ian@...ebsd.org>
Subject: Re: [RFC PATCH v2 4/4] script: make automatic dtb build info
 generation

On 2/21/20 10:14 AM, Alexandre Torgue wrote:
> 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
> 

Whatever the correct version of this ends up being, it should be
implemented as a single patch instead of patch 1/4 being modified
by patch 4/4.