linux-kernel - [PATCH V5 0/5] dt: build overlays

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Date:   Wed, 20 Jan 2021 12:36:42 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Gibson <david@...son.dropbear.id.au>,
        Bill Mills <bill.mills@...aro.org>, anmar.oueja@...aro.org,
        linux-kbuild@...r.kernel.org
Subject: [PATCH V5 0/5] dt: build overlays

Hi Frank/Rob,

I have picked all the related patches together into a single patchset,
so they can be properly reviewed/tested.

This patchset makes necessary changes to the kernel to add support for
building overlays (%.dtbo) and the required fdtoverlay tool. This also
builds static_test.dtb using some of the existing overlay tests present
in drivers/of/unittest-data/ for better test coverage.

Note that in order for anyone to test this stuff, you need to manually
run the ./update-dtc-source.sh script once to fetch the necessary
changes from the external DTC project (i.e. fdtoverlay.c and this[1]
patch).

Also note that Frank has already shared his concerns towards the error
reporting done by fdtoverlay tool [2], I have still included the patch
in this series for completeness, will see how to get that sorted out.

V5:

- Don't reuse DTC_SOURCE for fdtoverlay.c in patch 1/5 (Frank).

- Update .gitignore and scripts/Makefile.dtbinst, drop dtbo-y syntax and
  DTC_FLAGS += -@ in patch 4/5 (Masahiro).

- Remove the intermediate dtb, rename output to static_test.dtb, don't
  use overlay.dtb and overlay_base.dtb for static builds, improved
  layout/comments in Makefile for patch 5/5 (Frank).

--
Viresh

[1] https://github.com/dgibson/dtc/commit/163f0469bf2ed8b2fe5aa15bc796b93c70243ddc
[2] https://lore.kernel.org/lkml/74f8aa8f-ffab-3b0f-186f-31fb7395ebbb@gmail.com/

Viresh Kumar (5):
  scripts: dtc: Fetch fdtoverlay.c from external DTC project
  scripts: dtc: Build fdtoverlay tool
  scripts: dtc: Remove the unused fdtdump.c file
  kbuild: Add support to build overlays (%.dtbo)
  of: unittest: Statically apply overlays using fdtoverlay

 .gitignore                        |   3 +-
 Makefile                          |   4 +-
 drivers/of/unittest-data/Makefile |  50 +++++++++
 scripts/Makefile.dtbinst          |   3 +
 scripts/Makefile.lib              |   4 +-
 scripts/dtc/Makefile              |   6 +-
 scripts/dtc/fdtdump.c             | 163 ------------------------------
 scripts/dtc/update-dtc-source.sh  |   3 +-
 8 files changed, 66 insertions(+), 170 deletions(-)
 delete mode 100644 scripts/dtc/fdtdump.c

-- 
2.25.0.rc1.19.g042ed3e048af