[PATCH v3 4/8] dts: Add alternative location for upstream DTB builds

Tom Rini trini at konsulko.com
Thu Dec 28 21:31:11 CET 2023 

On Thu, Dec 28, 2023 at 07:48:06PM +0000, Simon Glass wrote:
> Hi Tom,
> 
> On Thu, Dec 28, 2023 at 3:54 PM Tom Rini <trini at konsulko.com> wrote:
> >
> > On Thu, Dec 28, 2023 at 03:09:12PM +0000, Simon Glass wrote:
> > > Hi Tom, Sumit,
> > >
> > > On Thu, Dec 28, 2023 at 2:03 PM Tom Rini <trini at konsulko.com> wrote:
> > > >
> > > > On Thu, Dec 28, 2023 at 01:37:26PM +0000, Simon Glass wrote:
> > > > > Hi Sumit,
> > > > >
> > > > > On Thu, Dec 28, 2023 at 11:58 AM Sumit Garg <sumit.garg at linaro.org> wrote:
> > > > > >
> > > > > > Allow platform owners to mirror devicetree files from devitree-rebasing
> > > > > > directory into dts/arch/$(ARCH) (special case for dts/arch/arm64). Then
> > > > > > build then along with any *-u-boot.dtsi file present in arch/$(ARCH)/dts
> > > > > > directory. Also add a new Makefile for arm64.
> > > > > >
> > > > > > This will help easy migration for platforms which currently are compliant
> > > > > > with upstream Linux kernel devicetree files.
> > > > > >
> > > > > > Signed-off-by: Sumit Garg <sumit.garg at linaro.org>
> > > > > > ---
> > > > > >
> > > > > > Changes in v3:
> > > > > > --------------
> > > > > > - Minor commit message update
> > > > > >
> > > > > > Changes in v2:
> > > > > > --------------
> > > > > > - s/DEVICE_TREE_LOC/dt_dir/ and s/U-boot/U-Boot/
> > > > > >
> > > > > >  dts/Kconfig             | 11 +++++++++++
> > > > > >  dts/Makefile            | 17 ++++++++++++++---
> > > > > >  dts/arch/arm64/Makefile | 14 ++++++++++++++
> > > > > >  3 files changed, 39 insertions(+), 3 deletions(-)
> > > > > >  create mode 100644 dts/arch/arm64/Makefile
> > > > > >
> > > > > > diff --git a/dts/Kconfig b/dts/Kconfig
> > > > > > index 00c0aeff893..e58c1c6f2ab 100644
> > > > > > --- a/dts/Kconfig
> > > > > > +++ b/dts/Kconfig
> > > > > > @@ -85,6 +85,17 @@ config OF_LIVE
> > > > > >           enables a live tree which is available after relocation,
> > > > > >           and can be adjusted as needed.
> > > > > >
> > > > > > +config OF_UPSTREAM
> > > > > > +       bool "Enable use of devicetree imported from Linux kernel release"
> > > > > > +       help
> > > > > > +         Traditionally, U-Boot platforms used to have their custom devicetree
> > > > > > +         files or copy devicetree files from Linux kernel which are hard to
> > > > > > +         maintain and can usually get out-of-sync from Linux kernel. This
> > > > > > +         option enables platforms to migrate to devicetree-rebasing repo where
> > > > > > +         a regular sync will be maintained every major Linux kernel release
> > > > > > +         cycle. However, platforms can still have some custom u-boot specific
> > > > > > +         bits maintained as part of *-u-boot.dtsi files.
> > > > >
> > > > > My only other suggestion here is to mention that this should be set in
> > > > > Kconfig, for the SoC as a whole. So I believe that means that it
> > > > > should be hidden, with no string for the 'bool':
> > > > >
> > > > >       bool  # Enable use of devicetree imported from Linux kernel release
> > > >
> > > > I think we can just keep prompting for it now, to make the transition
> > > > easier, before this option just goes away in time, hopefully.
> > > >
> > > > > Also, this doesn't seem to work for me. Before this series I get these
> > > > > files when building firefly-rk3399:
> > > > >
> > > > > rk3399-eaidk-610.dtb            rk3399-khadas-edge-v.dtb
> > > > > rk3399-orangepi.dtb        rk3399-rock-pi-4a.dtb
> > > > > rk3399-evb.dtb                  rk3399-leez-p710.dtb
> > > > > rk3399-pinebook-pro.dtb    rk3399-rock-pi-4c.dtb
> > > > > rk3399-ficus.dtb                rk3399-nanopc-t4.dtb
> > > > > rk3399-pinephone-pro.dtb   rk3399-rockpro64.dtb
> > > > > rk3399-firefly.dtb              rk3399-nanopi-m4-2gb.dtb
> > > > > rk3399pro-rock-pi-n10.dtb  rk3399-roc-pc.dtb
> > > > > rk3399-gru-bob.dtb              rk3399-nanopi-m4b.dtb
> > > > > rk3399-puma-haikou.dtb     rk3399-roc-pc-mezzanine.dtb
> > > > > rk3399-gru-kevin.dtb            rk3399-nanopi-m4.dtb
> > > > > rk3399-rock-4c-plus.dtb
> > > > > rk3399-khadas-edge-captain.dtb  rk3399-nanopi-neo4.dtb    rk3399-rock-4se.dtb
> > > > > rk3399-khadas-edge.dtb          rk3399-nanopi-r4s.dtb     rk3399-rock960.dtb
> > > > >
> > > > > Afterwards I get this:
> > > > >
> > > > > make[3]: *** No rule to make target
> > > > > 'dts/arch/arm64/rk3399-firefly.dtb', needed by 'dtbs'.  Stop.
> > > > >
> > > > > So I set this manually for that one board:
> > > > >
> > > > > CONFIG_DEFAULT_DEVICE_TREE="rockchip/rk3399-firefly"
> > > > >
> > > > > and get:
> > > > >
> > > > > make[3]: *** No rule to make target
> > > > > 'dts/arch/arm64/rockchip/rk3399-firefly.dtb', needed by 'dtbs'.  Stop.
> > > > >
> > > > > I am not sure how to fix this, nor how this can be made to build all
> > > > > the DTs for rk3399, as it does today.
> > > >
> > > > Looking at the patch for amlogic boards, you need to make the link to
> > > > devicetree-rebasing inside dts/...
> > >
> > > OK, let me give up on rk3399 for now...that doesn't seem to work even
> > > with the link.
> > >
> > > Using odroid-c2 with -next I see:
> > >
> > > $ ls /tmp/b/odroid-c2/arch/arm/dts/
> > > meson-a1-ad401.dtb                 meson-g12b-odroid-n2l.dtb
> > >     meson-gxl-s905x-libretech-cc.dtb
> > > meson-axg-jethome-jethub-j100.dtb  meson-g12b-odroid-n2-plus.dtb
> > >     meson-gxl-s905x-libretech-cc-v2.dtb
> > > meson-axg-s400.dtb                 meson-g12b-radxa-zero2.dtb
> > >     meson-gxl-s905x-p212.dtb
> > > meson-g12a-radxa-zero.dtb          meson-gxbb-kii-pro.dtb
> > >     meson-gxm-gt1-ultimate.dtb
> > > meson-g12a-sei510.dtb              meson-gxbb-nanopi-k2.dtb
> > >     meson-gxm-khadas-vim2.dtb
> > > meson-g12a-u200.dtb                meson-gxbb-odroidc2.dtb
> > >     meson-gxm-s912-libretech-pc.dtb
> > > meson-g12b-a311d-bananapi-m2s.dtb  meson-gxbb-p200.dtb
> > >     meson-gxm-wetek-core2.dtb
> > > meson-g12b-a311d-khadas-vim3.dtb   meson-gxbb-p201.dtb
> > >     meson-sm1-bananapi-m2-pro.dtb
> > > meson-g12b-bananapi-cm4-cm4io.dtb  meson-gxbb-wetek-hub.dtb
> > >     meson-sm1-bananapi-m5.dtb
> > > meson-g12b-gsking-x.dtb            meson-gxbb-wetek-play2.dtb
> > >     meson-sm1-khadas-vim3l.dtb
> > > meson-g12b-gtking.dtb              meson-gxl-s805x-libretech-ac.dtb
> > >     meson-sm1-odroid-c4.dtb
> > > meson-g12b-gtking-pro.dtb          meson-gxl-s905d-libretech-pc.dtb
> > >     meson-sm1-odroid-hc4.dtb
> > > meson-g12b-odroid-go-ultra.dtb
> > > meson-gxl-s905w-jethome-jethub-j80.dtb  meson-sm1-sei610.dtb
> > > meson-g12b-odroid-n2.dtb           meson-gxl-s905x-khadas-vim.dtb
> > > $
> > > With this series (sort of, since I am really not sure how to
> > > cherry-pick the commits from the PR) I see nothing:
> > >
> > > $ ls /tmp/b/odroid-c2/arch/arm/dts/
> > > $
> > >
> > > This shows some of the files:
> > >
> > > $ find /tmp/b/odroid-c2/ -name "*.dtb"
> > > /tmp/b/odroid-c2/dts/dt.dtb
> > > /tmp/b/odroid-c2/dts/arch/arm64/amlogic/meson-gxbb-odroidc2.dtb
> > > /tmp/b/odroid-c2/dts/arch/arm64/amlogic/meson-gxbb-nanopi-k2.dtb
> > > /tmp/b/odroid-c2/dts/arch/arm64/amlogic/meson-gxbb-wetek-play2.dtb
> > > /tmp/b/odroid-c2/dts/arch/arm64/amlogic/meson-gxbb-kii-pro.dtb
> > > /tmp/b/odroid-c2/dts/arch/arm64/amlogic/meson-gxbb-p200.dtb
> > > /tmp/b/odroid-c2/dts/arch/arm64/amlogic/meson-gxbb-p201.dtb
> > > /tmp/b/odroid-c2/dts/arch/arm64/amlogic/meson-gxbb-wetek-hub.dtb
> > > /tmp/b/odroid-c2/u-boot.dtb
> > >
> > > but where are the rest? Also, is it possible to put the output .dtb
> > > files into the same directory? Otherwise we may have some pain with
> > > binman.
> >
> > What do you mean by same directory? But maybe also, what's an example of
> > a board you think might end up having problems? Converting that in a
> > follow-up series is likely a good idea, to highlight and address these
> > issues sooner rather than later.#
> 
> Today the .dtb files go into arch/arm/dts - so it would be easier if
> this series could do the same.

But that's just an artifact of not having vendor directories. I don't
really think we can sanely put the new object files in there, that's not
what anyone is going to expect.

> The problem I have described above applied to meson, so I believe it
> is clear enough with that. I wasn't able to get rk3399 going, but I am
> sure it would have the same problem.

I don't think meson has the problem I was asking about, which is what
problem binman will have, because the series to make binman replace the
vendor tools didn't complete? That's what I'm getting at, for which
platform is binman going to have a problem today, so that we can look at
what to do about it and evaluate solutions with an example in hand.

> The fundamental question is (I believe) whether to:
> 
> 1. Build only a single DT for a board
> 2. Build all DTs for the SoC the board uses
> 
> This series seems to head towards (1), which worries me. We are
> currently mostly at (2).

It's explicitly at (1) with the notion we'll deal with (2) down the
road once there's a use case for it.  Possibly once someone updates
exynos platforms, based on what you had said previously?

-- 
Tom
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