Re: [PATCH 0/2] of: dynamic: restrict overlay by targets

Frank Rowand
2017-12-05T01:15:19Z

Hi Alan,

In the RFC thread "of: Add whitelist", I did not understand the use case and
asked you some questions (30 Nov 2017 07:46:36 -0500), that you seem to have
overlooked (or my mail server failed to deliver your answer to me). Can you
please answer that question so I can better understand this patch set is
needed for.

Thanks,

Frank

On 12/04/17 14:13, Alan Tull wrote:
> Restrict which nodes are valid targets for a DT overlay.
>
> Add a flag bit to struct device_node allowing nodes to be marked as
> valid target for overlays.
>
> A driver that is always intended to handle DT overlays can
> enable overlays by calling a function for its DT node.
>
> For individual nodes that need to be opened up for a specific use,
> adding the property "overlay-allowed" enables overlays targeting
> that node. I'll need to document the DT property, not sure where
> specifically. New file bindings/overlay.txt?
>
> This patchset differs from the RFC:
> * Added a flag bit and got rid of the whitelist
> * Renamed the functions that enable a node
> * Added a DT property
>
> Alan Tull (2):
> of: overlay: add flag enabling overlays and enable fpga-region
> overlays
> of: dynamic: add overlay-allowed DT property
>
> drivers/fpga/of-fpga-region.c | 4 ++++
> drivers/of/base.c | 4 ++--
> drivers/of/dynamic.c | 3 +++
> drivers/of/fdt.c | 3 +++
> drivers/of/of_private.h | 2 ++
> drivers/of/overlay.c | 26 ++++++++++++++++++++++++++
> include/linux/of.h | 19 +++++++++++++++++++
> 7 files changed, 59 insertions(+), 2 deletions(-)
>