Re: [PATCH v5 01/11] of/platform: Allow overlays to create platform devices from the root node

[Rob Herring (Arm)]

On Mon, 03 Jun 2024 15:37:58 -0700, Stephen Boyd wrote:
> We'd like to apply overlays to the root node in KUnit so we can test
> platform devices created as children of the root node.
> 
> On some architectures (powerpc), the root node isn't marked with
> OF_POPULATED_BUS. If an overlay tries to modify the root node on these
> platforms it will fail, while on other platforms, such as ARM, it will
> succeed. This is because the root node is marked with OF_POPULATED_BUS
> by of_platform_default_populate_init() calling
> of_platform_default_populate() with NULL as the first argument.
> 
> Loosen the requirement here so that platform devices can be created for
> nodes created as children of the root node via DT overlays even if the
> platform bus wasn't populated for the root node.
> 
> Cc: Rob Herring <robh@xxxxxxxxxx>
> Cc: Saravana Kannan <saravanak@xxxxxxxxxx>
> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
> ---
>  drivers/of/platform.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 

Reviewed-by: Rob Herring (Arm) <robh@xxxxxxxxxx>