linux-kernel - Re: [PATCH v3 0/2] of: populate of_root

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Message-ID: <20230227103112.47a5c0c3@fixe.home>
Date:   Mon, 27 Feb 2023 10:31:12 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lizhi Hou <lizhi.hou@...inx.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 0/2] of: populate of_root_node if not set (alternate)

Le Thu, 23 Feb 2023 15:39:31 -0600,
Frank Rowand <frowand.list@...il.com> a écrit :

> Hi Clément,
> 
> Can you please test this version of the patch series?

Hi Frank,

I can confirm it now works as expected, thanks for your patch !

Tested-by: Clément Léger <clement.leger@...tlin.com>

Clément

> 
> Thanks!
> 
> -Frank
> 
> On 2/23/23 15:34, Frank Rowand wrote:
> > This series is a different implementation to achieve the goals of
> > https://lore.kernel.org/r/20220623105044.152832-1-clement.leger@bootlin.com
> > 
> > In order to apply overlays or create new nodes under the root node, the
> > kernel expects of_root to be set. On some system where a device-tree was
> > not provided by firmware (x86 for instance) if CONFIG_OF is enabled,
> > then we will end up with a null of_root. This series adds support to
> > create this root node using a builtin dtb and removes the manual
> > creation of the root node done in unittests.c.
> > 
> > Changes since version 2: (patch 1/2)
> >   - change of __dtb_empty_root_* from "void *" to "uint8_t []"
> > 
> > Changes since version 1: (patch 1/2)
> >   - refresh for 6.2-rc1
> >   - update Signed-off-by
> >   - fix typo in of_fdt.h: s/of_setup/setup_of
> >   - unflatten_device_tree(): validate size in header field dtb_empty_root
> >     that will be used to copy dtb_empty_root
> >   - add Kconfig option to manually select CONFIG_OF_EARLY_FLATTREE
> > 
> > Changes since version 1: (patch 2/2)
> >   - refresh for 6.2-rc1
> >   - update Signed-off-by
> >   - fix formatting error (leading space) in patch comment
> > 
> > Frank Rowand (2):
> >   of: create of_root if no dtb provided
> >   of: unittest: treat missing of_root as error instead of fixing up
> > 
> >  drivers/of/Kconfig        |  7 ++++++-
> >  drivers/of/Makefile       |  2 +-
> >  drivers/of/empty_root.dts |  6 ++++++
> >  drivers/of/fdt.c          | 27 ++++++++++++++++++++++++++-
> >  drivers/of/unittest.c     | 16 ++++++----------
> >  include/linux/of_fdt.h    |  2 ++
> >  init/main.c               |  2 ++
> >  7 files changed, 49 insertions(+), 13 deletions(-)
> >  create mode 100644 drivers/of/empty_root.dts
> >   
> 



-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com