Message-ID: <da77e965-2893-097a-b438-85787c43dcb0@linaro.org>
Date:   Fri, 22 Sep 2023 09:01:41 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Simon Glass <sjg@...omium.org>, devicetree@...r.kernel.org
Cc:     U-Boot Mailing List <u-boot@...ts.denx.de>,
        linux-mtd@...ts.infradead.org, Tom Rini <trini@...sulko.com>,
        Rob Herring <robh@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Dhruva Gole <d-gole@...com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Rafał Miłecki <rafal@...ecki.pl>,
        Richard Weinberger <richard@....at>,
        Rob Herring <robh+dt@...nel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: mtd: Add a schema for binman

On 21/09/2023 20:45, Simon Glass wrote:
> Binman[1] is a tool for creating firmware images. It allows you to
> combine various binaries and place them in an output file.
> 
> Binman uses a DT schema to describe an image, in enough detail that
> it can be automatically built from component parts, disassembled,
> replaced, listed, etc.
> 
> Images are typically stored in flash, which is why this binding is
> targeted at mtd. Previous discussion is at [2] [3].
> 
> [1] https://u-boot.readthedocs.io/en/stable/develop/package/binman.html
> [2] https://lore.kernel.org/u-boot/20230821180220.2724080-3-sjg@chromium.org/
> [3] https://www.spinics.net/lists/devicetree/msg626149.html
> 
> Signed-off-by: Simon Glass <sjg@...omium.org>
> ---
> 
>  .../bindings/mtd/partitions/binman.yaml       | 50 +++++++++++++++
>  .../bindings/mtd/partitions/binman/entry.yaml | 61 +++++++++++++++++++
>  .../bindings/mtd/partitions/partitions.yaml   |  1 +
>  MAINTAINERS                                   |  5 ++
>  4 files changed, 117 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman.yaml
>  create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman/entry.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> new file mode 100644
> index 00000000000000..c792d5a37b700a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> @@ -0,0 +1,50 @@
> +# 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>
> +
> +description: |
> +  The binman node provides a layout for firmware, used when packaging firmware
> +  from multiple projects. For now it just supports a very simple set of
> +  features, as a starting point for discussion.
> +
> +  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
> +
> +properties:
> +  compatible:
> +    const: u-boot,binman
> +
> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    firmware {
> +      binman {
> +        compatible = "u-boot,binman";
> +
> +        u-boot {

It does not look like you tested the bindings, at least after quick
look. Please run `make dt_binding_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).
Maybe you need to update your dtschema and yamllint.


> +          size = <0xa0000>;
> +        };
> +
> +        atf-bl31 {
> +          offset = <0x100000>;
> +        };
> +      };
> +    };
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman/entry.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman/entry.yaml
> new file mode 100644
> index 00000000000000..8003eb4f1a994f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/binman/entry.yaml
> @@ -0,0 +1,61 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2023 Google LLC
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/binman/entry.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Binman entry
> +
> +maintainers:
> +  - Simon Glass <sjg@...omium.org>
> +
> +description: |
> +  The entry node specifies a single entry in the firmware.
> +
> +  Entries have a specific type, such as "u-boot" or "atf-bl31". If the type
> +  is missing, the name is used as the type.
> +
> +  Note: This definition is intended to be hierarchical, so that entries can
> +  appear in other entries. Schema for that is TBD.
> +
> +properties:
> +  $nodename:
> +    pattern: "^[-a-z]+(-[0-9]+)?$"

Why do you need this?

> +
> +  type:
> +    $ref: /schemas/types.yaml#/definitions/string
> +
> +  offset:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Provides the offset of this entry from the start of its parent section.
> +      If this is omitted, Binman will determine this by packing the enclosing
> +      section according to alignment rules, etc.
> +
> +  size:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Provides the size of this entry in bytes. If this is omitted, Binman will
> +      use the content size, along with any alignment information, to determine
> +      the size of the entry.
> +


Best regards,
Krzysztof

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