Re: [PATCH V7 0/6] dt: build overlays

On Fri, 29 Jan 2021 12:54:04 +0530, Viresh Kumar wrote:

Hi,

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).

I have tested this patchset for static and runtime testing (on Hikey
board) and no issues were reported.

V7:
- Add a comment in scripts/dtc/Makefile
- Add Ack from Masahiro for patch 4/6.
- Drop word "merge" from commit log of 2/6.
- Split apply_static_overlay, static_test.dtb, and static_base.dts into
  two parts to handle overlay_base.dts and testcases.dts separately.

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/ (local)

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

I've applied the first 4 patches and did a dtc sync after patch 1.

Rob