Re: [PATCH v3 1/5] dt-bindings: net: Add network-class schema for mac-address properties

[Rob Herring <robh@kernel.org>]

On Tue, Mar 18, 2025 at 08:56:44PM +0100, David Heidelberg wrote:
> From: Janne Grunau <j@jannau.net>
> 
> The ethernet-controller schema specifies "mac-address" and
> "local-mac-address" but other network devices such as wireless network
> adapters use mac addresses as well.
> The Devicetree Specification, Release v0.3 specifies in section 4.3.1
> a generic "Network Class Binding" with "address-bits", "mac-address",
> "local-mac-address" and "max-frame-size". This schema specifies the
> "address-bits" property and moves the remaining properties over from
> the ethernet-controller.yaml schema.
> 
> The "max-frame-size" property is used to describe the maximal payload
> size despite its name. Keep the description from ethernet-controller
> specifying this property as MTU. The contradictory description in the
> Devicetree Specification is ignored.
> 
> Signed-off-by: Janne Grunau <j@jannau.net>
> ---
>  .../bindings/net/ethernet-controller.yaml          | 25 +-----------
>  .../devicetree/bindings/net/network-class.yaml     | 44 ++++++++++++++++++++++
>  2 files changed, 45 insertions(+), 24 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> index 45819b2358002bc75e876eddb4b2ca18017c04bd..c91b41b83d1dc1294e99ec72c7cdcc16550cb33e 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> @@ -16,30 +16,6 @@ properties:
>    label:
>      description: Human readable label on a port of a box.
>  
> -  local-mac-address:
> -    description:
> -      Specifies the MAC address that was assigned to the network device.
> -    $ref: /schemas/types.yaml#/definitions/uint8-array
> -    minItems: 6
> -    maxItems: 6
> -
> -  mac-address:
> -    description:
> -      Specifies the MAC address that was last used by the boot
> -      program; should be used in cases where the MAC address assigned
> -      to the device by the boot program is different from the
> -      local-mac-address property.
> -    $ref: /schemas/types.yaml#/definitions/uint8-array
> -    minItems: 6
> -    maxItems: 6
> -
> -  max-frame-size:
> -    $ref: /schemas/types.yaml#/definitions/uint32
> -    description:
> -      Maximum transfer unit (IEEE defined MTU), rather than the
> -      maximum frame size (there\'s contradiction in the Devicetree
> -      Specification).
> -
>    max-speed:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      description:
> @@ -262,6 +238,7 @@ dependencies:
>    pcs-handle-names: [pcs-handle]
>  
>  allOf:
> +  - $ref: /schemas/net/network-class.yaml#
>    - if:
>        properties:
>          phy-mode:
> diff --git a/Documentation/devicetree/bindings/net/network-class.yaml b/Documentation/devicetree/bindings/net/network-class.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..e126a02193e8cfba24215d3c850fde1e1b26480e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/network-class.yaml
> @@ -0,0 +1,44 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/network-class.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Network Class Common Properties
> +
> +maintainers:
> +  - Devicetree Specification Mailing List <devicetree-spec-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>

Just 'devicetree-spec@vger.kernel.org'

> +
> +properties:
> +  address-bits:
> +    description:
> +      Specifies number of address bits required to address the device described
> +      by this node. This property specifies number of bits in MAC address.
> +    default: 48
> +    const: 48
> +
> +  local-mac-address:
> +    description:
> +      Specifies MAC address that was assigned to the network device described by
> +      the node containing this property.
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    minItems: 6
> +    maxItems: 6
> +
> +  mac-address:
> +    description:
> +      Specifies the MAC address that was last used by the boot program. This
> +      property should be used in cases where the MAC address assigned to the
> +      device by the boot program is different from the
> +      local-mac-address property. This property shall be used only if the value
> +      differs from local-mac-address property value.
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    minItems: 6
> +    maxItems: 6
> +
> +  max-frame-size:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      Maximum transfer unit (IEEE defined MTU).

Can we keep the rest of the description about the contradiction?

> +
> +additionalProperties: true
> 
> -- 
> 2.49.0
>