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

Alan Tull
2017-12-04T19:14:03Z

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(-)

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2.7.4