linux-kernel - [RFC PATCH v2 0/4] Add device tree build information

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Message-ID: <20200221161418.20225-1-alexandre.torgue@st.com>
Date:   Fri, 21 Feb 2020 17:14:14 +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 0/4] Add device tree build information

(with title it's better ;)

Hi,

The goal of this series is to add device tree build information in dtb.
This information can be dtb build date, where devicetree files come from,
who built the dtb ... Actually, same kind of information that you can find
in the Linux banner which is printout during kernel boot. Having the same
kind of information for device tree is useful for debugging and maintenance.

A file (dtb-build.txt) containing a string with build information (e.g.,
>From Linux 5.5.0-rc1 by alex the Mon Jan 13 18:25:38 CET 2020) is generated by
"gen_dtb_build_info.sh" script. 

This file has to be included manually in each dts file that would like to use 
this build information.

of/fdt.c is modified to printout "build-info" property during Kernel boot and 
scripts/Makefile.lib is modified to call "gen_dtb_build_info.sh" script.

Patch 1 & 2 script and of/fdt.c updates
Patch 3 is an example of use in stm32mp157c-dk2.dts file.
Patch 4 is a tentative to make it automatic (not yet 100% functional).

regards
Alex

Changes since v1;
 - Remove modification in dtc (no more -B option)
 - Generate a file containing build info which is directly included in dts
   file.

Regards
Alex

Alexandre Torgue (4):
  scripts: Add script to generate dtb build information
  of: fdt: print dtb build information
  ARM: dts: stm32: Add dtb build information entry for stm32mp157c-dk2
  script: make automatic dtb build info generation

 arch/arm/boot/dts/stm32mp157c-dk2.dts |  1 +
 drivers/of/fdt.c                      |  9 +++++++++
 scripts/Makefile.lib                  |  3 +++
 scripts/gen_dtb_build_info.sh         | 12 ++++++++++++
 4 files changed, 25 insertions(+)
 create mode 100755 scripts/gen_dtb_build_info.sh

-- 
2.17.1