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

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Date:   Thu, 23 Feb 2023 15:39:31 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Clément Léger <clement.leger@...tlin.com>
Cc:     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)

Hi Clément,

Can you please test this version of the patch series?

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
>