On Thu, Feb 17, 2022 at 11:24:48AM +0100, Rafał Miłecki wrote: > From: Rafał Miłecki <rafal@xxxxxxxxxx> > > UBI is often used on embedded devices to store UBI volumes with device > configuration / calibration data. Such volumes may need to be documented > and referenced for proper boot & setup. > > Some examples: > 1. U-Boot environment variables > 2. Device calibration data > 3. Default setup (e.g. initial password) > > Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx> This is very useful and can replace the downstream hacks we are currently using for this purpose in OpenWrt. Reviewed-by: Daniel Golle <daniel@xxxxxxxxxxxxxx> > --- > .../bindings/mtd/partitions/ubi.yaml | 67 +++++++++++++++++++ > 1 file changed, 67 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mtd/partitions/ubi.yaml > > diff --git a/Documentation/devicetree/bindings/mtd/partitions/ubi.yaml b/Documentation/devicetree/bindings/mtd/partitions/ubi.yaml > new file mode 100644 > index 000000000000..cd081f06d4cb > --- /dev/null > +++ b/Documentation/devicetree/bindings/mtd/partitions/ubi.yaml > @@ -0,0 +1,67 @@ > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/mtd/partitions/ubi.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: UBI (Unsorted Block Images) device > + > +description: | > + UBI is a layer providing logical volumes (consisting of logical blocks) on top > + of raw flash devices. It deals with low-level flash issues (bit-flips, bad > + physical eraseblocks, wearing) providing a reliable data storage. > + > + UBI device is built and stored in a single flash partition. > + > + Some (usually embedded) devices use UBI volumes of specific names or indexes > + to store setup / configuration data. This binding allows describing such > + volumes so they can be identified and referenced by consumers. > + > +maintainers: > + - Rafał Miłecki <rafal@xxxxxxxxxx> > + > +allOf: > + - $ref: partition.yaml# > + > +properties: > + compatible: > + const: ubi > + > +patternProperties: > + "^volume-[0-9a-f]+$": > + type: object > + description: UBI volume > + properties: > + volume-name: > + $ref: /schemas/types.yaml#/definitions/string > + volume-id: > + $ref: /schemas/types.yaml#/definitions/uint32 > + anyOf: > + - required: > + - volume-name > + - required: > + - volume-id > + > +unevaluatedProperties: false > + > +examples: > + - | > + partitions { > + compatible = "fixed-partitions"; > + #address-cells = <1>; > + #size-cells = <1>; > + > + partition@0 { > + compatible = "ubi"; > + reg = <0x0000000 0x1000000>; > + label = "filesystem"; > + > + env: volume-0 { > + volume-name = "u-boot-env"; > + }; > + > + calibration: volume-1 { > + volume-id = <99>; > + }; > + }; > + }; > -- > 2.34.1 >
