linux-kernel - Re: [PATCH v4 1/3] dt-bindings: mtd: partitions: Add binman compatible

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Message-ID: <20231024155728.GA3707756-robh@kernel.org>
Date:   Tue, 24 Oct 2023 10:57:28 -0500
From:   Rob Herring <robh@...nel.org>
To:     Simon Glass <sjg@...omium.org>
Cc:     devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Michael Walle <mwalle@...nel.org>,
        U-Boot Mailing List <u-boot@...ts.denx.de>,
        Tom Rini <trini@...sulko.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Dhruva Gole <d-gole@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/3] dt-bindings: mtd: partitions: Add binman
 compatible

On Mon, Oct 09, 2023 at 04:04:13PM -0600, Simon Glass wrote:
> Add a compatible string for binman, so we can extend fixed-partitions
> in various ways.
> 
> Signed-off-by: Simon Glass <sjg@...omium.org>
> ---
> 
> Changes in v4:
> - Change subject line
> 
> Changes in v3:
> - Drop fixed-partition additional compatible string
> - Drop fixed-partitions from the example
> - Mention use of compatible instead of label
> 
> Changes in v2:
> - Drop mention of 'enhanced features' in fixed-partitions.yaml
> - Mention Binman input and output properties
> - Use plain partition@xxx for the node name
> 
>  .../bindings/mtd/partitions/binman.yaml       | 63 +++++++++++++++++++
>  .../bindings/mtd/partitions/partitions.yaml   |  1 +
>  MAINTAINERS                                   |  5 ++
>  3 files changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> new file mode 100644
> index 000000000000..7d6c8bd738f5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2023 Google LLC
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/binman.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Binman firmware layout
> +
> +maintainers:
> +  - Simon Glass <sjg@...omium.org>
> +
> +select: false
> +
> +description: |
> +  The binman node provides a layout for firmware, used when packaging firmware
> +  from multiple projects. It is based on fixed-partitions, with some
> +  extensions, but uses 'compatible' to indicate the contents of the node, to
> +  avoid perturbing or confusing existing installations which use 'label' for a
> +  particular purpose.
> +
> +  Binman supports properties used as inputs to the firmware-packaging process,
> +  such as those which control alignment of partitions. This binding addresses
> +  these 'input' properties. For example, it is common for the 'reg' property
> +  (an 'output' property) to be set by Binman, based on the alignment requested
> +  in the input.
> +
> +  Once processing is complete, input properties have mostly served their
> +  purpose, at least until the firmware is repacked later, e.g. due to a
> +  firmware update. The 'fixed-partitions' binding should provide enough
> +  information to read the firmware at runtime, including decompression if
> +  needed.
> +
> +  Documentation for Binman is available at:
> +
> +  https://u-boot.readthedocs.io/en/latest/develop/package/binman.html
> +
> +  with the current image-description format at:
> +
> +  https://u-boot.readthedocs.io/en/latest/develop/package/binman.html#image-description-format
> +
> +allOf:
> +  - $ref: /schemas/mtd/partitions/fixed-partitions.yaml#
> +
> +properties:
> +  compatible:
> +    const: binman

This couldn't possibly pass validation. Including fixed-partitions.yaml 
says the compatible must be one thing and this says something else.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    partitions {
> +        compatible = "binman";
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +
> +        partition@...000 {
> +            label = "u-boot";
> +            reg = <0x100000 0xf00000>;
> +        };
> +    };
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
> index 1dda2c80747b..849fd15d085c 100644
> --- a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
> +++ b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
> @@ -15,6 +15,7 @@ maintainers:
>  
>  oneOf:
>    - $ref: arm,arm-firmware-suite.yaml
> +  - $ref: binman.yaml
>    - $ref: brcm,bcm4908-partitions.yaml
>    - $ref: brcm,bcm947xx-cfe-partitions.yaml
>    - $ref: fixed-partitions.yaml
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c934244acc31..ebc8158fe67d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3536,6 +3536,11 @@ F:	Documentation/filesystems/bfs.rst
>  F:	fs/bfs/
>  F:	include/uapi/linux/bfs_fs.h
>  
> +BINMAN
> +M:	Simon Glass <sjg@...omium.org>
> +S:	Supported
> +F:	Documentation/devicetree/bindings/mtd/partitions/binman*
> +
>  BITMAP API
>  M:	Yury Norov <yury.norov@...il.com>
>  R:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> -- 
> 2.42.0.609.gbb76f46606-goog
>