linux-kernel - Re: [PATCH V11 0/5] dt: Add fdtoverlay rule and statically build unittest

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Date:   Thu, 11 Mar 2021 17:27:00 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        David Gibson <david@...son.dropbear.id.au>,
        Michal Simek <michal.simek@...inx.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        anmar.oueja@...aro.org, Bill Mills <bill.mills@...aro.org>,
        devicetree@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH V11 0/5] dt: Add fdtoverlay rule and statically build
 unittest

On 3/9/21 11:35 PM, Viresh Kumar wrote:
> Hi,
> 
> This patchset adds a generic rule for applying overlays using fdtoverlay
> tool and then updates unittests to get built statically using the same.
> 
> V10->V11:
> - Update patch 4/5 to fix checkpatch warning on spaces and tabs.
> - Added Acked-by from Masahiro for patch 2/5.
> 
> V9->V10:
> - Add a new patch to allow .dtso files.
> - Update 2/5 to be more efficient and also generate symbols for base
>   files automatically.
> - No need to add lines like DTC_FLAGS_foo_base += -@ in patch 5/5.
> - Add Ack by Masahiro for 1/5.
> 
> V8->V9:
> - Added some comment in patch 3/4 based on Frank's suggestions.
> 
> V7->V8:
> - Patch 1 is new.
> - Platforms need to use dtb-y += foo.dtb instead of overlay-y +=
>   foo.dtb.
> - Use multi_depend instead of .SECONDEXPANSION.
> - Use dtb-y for unittest instead of overlay-y.
> - Rename the commented dtb filess in unittest Makefile as .dtbo.
> - Improved Makefile code (I am learning a lot every day :)
> 
> V6->V7:
> - Dropped the first 4 patches, already merged.
> - Patch 1/3 is new, suggested by Rob and slightly modified by me.
> - Adapt Patch 3/3 to the new rule and name the overlay dtbs as .dtbo.
> 
> --
> Viresh
> 
> Rob Herring (1):
>   kbuild: Add generic rule to apply fdtoverlay
> 
> Viresh Kumar (4):
>   kbuild: Simplify builds with CONFIG_OF_ALL_DTBS
>   kbuild: Allow .dtso format for overlay source files
>   of: unittest: Create overlay_common.dtsi and testcases_common.dtsi
>   of: unittest: Statically apply overlays using fdtoverlay
> 
>  drivers/of/unittest-data/Makefile             | 48 ++++++++++
>  drivers/of/unittest-data/overlay_base.dts     | 90 +-----------------
>  drivers/of/unittest-data/overlay_common.dtsi  | 91 +++++++++++++++++++
>  drivers/of/unittest-data/static_base_1.dts    |  4 +
>  drivers/of/unittest-data/static_base_2.dts    |  4 +
>  drivers/of/unittest-data/testcases.dts        | 23 ++---
>  .../of/unittest-data/testcases_common.dtsi    | 19 ++++
>  .../of/unittest-data/tests-interrupts.dtsi    | 11 +--
>  scripts/Makefile.lib                          | 40 ++++++--
>  9 files changed, 218 insertions(+), 112 deletions(-)
>  create mode 100644 drivers/of/unittest-data/overlay_common.dtsi
>  create mode 100644 drivers/of/unittest-data/static_base_1.dts
>  create mode 100644 drivers/of/unittest-data/static_base_2.dts
>  create mode 100644 drivers/of/unittest-data/testcases_common.dtsi
> 
> 
> base-commit: a38fd8748464831584a19438cbb3082b5a2dab15
> 

Does not apply to 5.12-rc2 because of a dependency on a patch to
scripts/Makefile.lib.  That patch has been merged by Linus
somewhere between -rc2 and -rc3.  I had a working version
between -rc2 and -rc3 at commit e6f197677b2e that does have
the required patch, so that is the version I used to test
this series.

There is still confusion caused by the contortions that unittest
goes through to mis-use base DTBs vs overlay DTBs, so _after_
this series is merged by Rob, I will poke around and see if
I can change unittest so that it does not look like it is
mis-using DTBs and overlay DTBs.


Reviewed-by: Frank Rowand <frank.rowand@...y.com>
Tested-by: Frank Rowand <frank.rowand@...y.com>