[PATCH RFC 1/2] dt-bindings: mtd: ubi-volume: add 'volume-is-critical' property

[Daniel Golle <daniel@makrotopia.org>]

Add the 'volume-is-critical' boolean property which marks a UBI volume
as critical for the device to boot. If set it prevents the user from
all kinds of write access to the volume as well as from renaming it or
detaching the UBI device it is located on.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 .../devicetree/bindings/mtd/partitions/ubi-volume.yaml   | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml b/Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml
index 19736b26056b..2bd751bb7f9e 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml
@@ -29,6 +29,15 @@ properties:
     description:
       This container may reference an NVMEM layout parser.
 
+  volume-is-critical:
+    description: This parameter, if present, indicates that the UBI volume
+      contains early-boot firmware images or data which should not be clobbered.
+      If set, it prevents the user from renaming the volume, writing to it or
+      making any changes affecting it, as well as detaching the UBI device it is
+      located on, so direct access to the underlying MTD device is prevented as
+      well.
+    type: boolean
+
 anyOf:
   - required:
       - volid
-- 
2.46.2