linux-kernel - Re: [PATCH v3 1/8] dt-bindings: mtd: add basic bindings for UBI

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Message-ID: <20230809225834.GA3144140-robh@kernel.org>
Date:   Wed, 9 Aug 2023 16:58:34 -0600
From:   Rob Herring <robh@...nel.org>
To:     Daniel Golle <daniel@...rotopia.org>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/8] dt-bindings: mtd: add basic bindings for UBI

On Tue, Aug 08, 2023 at 05:03:19PM +0100, Daniel Golle wrote:
> Add basic bindings for UBI devices and volumes.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
>  .../bindings/mtd/partitions/linux,ubi.yaml    | 65 +++++++++++++++++++
>  .../bindings/mtd/partitions/ubi-volume.yaml   | 35 ++++++++++
>  2 files changed, 100 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/linux,ubi.yaml
>  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/linux,ubi.yaml b/Documentation/devicetree/bindings/mtd/partitions/linux,ubi.yaml
> new file mode 100644
> index 0000000000000..79cfa0a3eaa7d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/linux,ubi.yaml
> @@ -0,0 +1,65 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/linux,ubi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Unsorted Block Images
> +
> +description: |
> +  UBI ("Unsorted Block Images") is a volume management system for raw
> +  flash devices which manages multiple logical volumes on a single
> +  physical flash device and spreads the I/O load (i.e, wear-leveling)
> +  across whole flash chip.
> +
> +maintainers:
> +  - Daniel Golle <daniel@...rotopia.org>
> +
> +allOf:
> +  - $ref: partition.yaml#
> +
> +properties:
> +  compatible:
> +    const: linux,ubi
> +
> +  volumes:
> +    type: object
> +    description: UBI Volumes
> +
> +    patternProperties:
> +      "^ubi-volume-.*$":
> +        $ref: "/schemas/mtd/partitions/ubi-volume.yaml"

Don't need quotes.

> +
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    partitions {
> +        compatible = "fixed-partitions";
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        partition@0 {
> +            reg = <0x0 0x100000>;
> +            label = "bootloader";
> +            read-only;
> +        };
> +
> +        partition@...000 {
> +            reg = <0x100000 0x1ff00000>;
> +            label = "ubi";
> +            compatible = "linux,ubi";
> +
> +            volumes {
> +                ubi-volume-caldata {
> +                    volid = <2>;
> +                    volname = "rf";
> +                };
> +            };
> +        };
> +    };
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml b/Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml
> new file mode 100644
> index 0000000000000..c17d0caf07d97
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/ubi-volume.yaml
> @@ -0,0 +1,35 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/ubi-volume.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: UBI volume
> +
> +description: |
> +  This binding describes a single UBI volume. Volumes can be matches either
> +  by their ID or their name, or both.
> +
> +maintainers:
> +  - Daniel Golle <daniel@...rotopia.org>
> +
> +properties:
> +  volid:

volume-id or ubi-vol-id.

> +    $ref: "/schemas/types.yaml#/definitions/uint32"

Drop quotes.

> +    description:
> +      Match UBI volume ID
> +
> +  volname:
> +    $ref: "/schemas/types.yaml#/definitions/string"
> +    description:
> +      Match UBI volume ID

ID? 

> +
> +anyOf:
> +  - required:
> +    - volid
> +
> +  - required:
> +    - volname
> +
> +# This is a generic file other binding inherit from and extend
> +additionalProperties: true

Where do we restrict this? You referenced it, but didn't didn't restrict 
it there (with unevaluatedProperties).

What other properties would you expect? These nodes ultimately need a 
single schema (can be multiple files with $ref's) containing all 
possible properties. Otherwise, any random property can be added 
unchecked.

Rob