linux-kernel - [PATCH V6 0/6] dt: build overlays

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Message-Id: <cover.1611312122.git.viresh.kumar@linaro.org>
Date:   Fri, 22 Jan 2021 16:20:30 +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>,
        linux-kernel@...r.kernel.org, anmar.oueja@...aro.org,
        Bill Mills <bill.mills@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        devicetree@...r.kernel.org, linux-kbuild@...r.kernel.org
Subject: [PATCH V6 0/6] dt: build overlays

Hi Frank/Rob,

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 most 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], and David said it is not that
straight forward to make such changes in fdtoverlay. I have still
included the patch in this series for completeness.

FWIW, with fdtoverlay we generate a new build warning now, not sure why
though:

drivers/of/unittest-data/tests-interrupts.dtsi:20.5-28: Warning (interrupts_property): /testcase-data/testcase-device2:#interrupt-cells: size is (4), expected multiple of 8

V6:
- Create separate rules for dtbo-s and separate entries in .gitignore in
  4/6 (Masahiro).
- A new file layout for handling all overlays for existing and new tests
  5/6 (Frank).
- Include overlay.dts as well now in 6/6 (Frank).

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 (6):
  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: Create overlay_common.dtsi and testcases_common.dtsi
  of: unittest: Statically apply overlays using fdtoverlay

 .gitignore                                    |   1 +
 Makefile                                      |   5 +-
 drivers/of/unittest-data/Makefile             |  51 ++++++
 drivers/of/unittest-data/overlay_base.dts     |  90 +---------
 drivers/of/unittest-data/overlay_common.dtsi  |  91 ++++++++++
 drivers/of/unittest-data/static_base.dts      |   5 +
 drivers/of/unittest-data/testcases.dts        |  17 +-
 .../of/unittest-data/testcases_common.dtsi    |  18 ++
 scripts/Makefile.dtbinst                      |   3 +
 scripts/Makefile.lib                          |   5 +
 scripts/dtc/Makefile                          |   6 +-
 scripts/dtc/fdtdump.c                         | 163 ------------------
 scripts/dtc/update-dtc-source.sh              |   3 +-
 13 files changed, 187 insertions(+), 271 deletions(-)
 create mode 100644 drivers/of/unittest-data/overlay_common.dtsi
 create mode 100644 drivers/of/unittest-data/static_base.dts
 create mode 100644 drivers/of/unittest-data/testcases_common.dtsi
 delete mode 100644 scripts/dtc/fdtdump.c

-- 
2.25.0.rc1.19.g042ed3e048af