Subject: Re: [net-next RFC PATCH 02/14] dt-bindings: net: move PHY modes to common PHY mode types definition

From: Rob Herring <[email-masked]>
Date: Mon, 20 Nov 2023 10:30:49 -0700

On Mon, Nov 20, 2023 at 02:50:29PM +0100, Christian Marangi wrote:
> Move PHY modes from ethernet-controller schema to dedicated common PHY
> mode types definition. This is needed to have a centralized place to
> define PHY interface mode and permit usage and reference of these modes
> in other schemas.
> 
> Signed-off-by: Christian Marangi <[email-masked]>
> ---
>  .../bindings/net/ethernet-controller.yaml     |  47 +------
>  .../bindings/net/ethernet-phy-mode-types.yaml | 132 ++++++++++++++++++
>  2 files changed, 133 insertions(+), 46 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/net/ethernet-phy-mode-types.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/ethernet-controller.yaml b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> index 9f6a5ccbcefe..40c1daff2a48 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-controller.yaml
> @@ -55,55 +55,10 @@ properties:
>      const: mac-address
>  
>    phy-connection-type:
> +    $ref: /schemas/net/ethernet-phy-mode-types.yaml#definitions/phy-connection-type

You need a '/' after '#' or it is not a JSON pointer.

>      description:
>        Specifies interface type between the Ethernet device and a physical
>        layer (PHY) device.
> -    enum:
> -      # There is not a standard bus between the MAC and the PHY,
> -      # something proprietary is being used to embed the PHY in the
> -      # MAC.
> -      - internal
> -      - mii
> -      - gmii
> -      - sgmii
> -      - psgmii
> -      - qsgmii
> -      - qusgmii
> -      - tbi
> -      - rev-mii
> -      - rmii
> -      - rev-rmii
> -      - moca
> -
> -      # RX and TX delays are added by the MAC when required
> -      - rgmii
> -
> -      # RGMII with internal RX and TX delays provided by the PHY,
> -      # the MAC should not add the RX or TX delays in this case
> -      - rgmii-id
> -
> -      # RGMII with internal RX delay provided by the PHY, the MAC
> -      # should not add an RX delay in this case
> -      - rgmii-rxid
> -
> -      # RGMII with internal TX delay provided by the PHY, the MAC
> -      # should not add an TX delay in this case
> -      - rgmii-txid
> -      - rtbi
> -      - smii
> -      - xgmii
> -      - trgmii
> -      - 1000base-x
> -      - 2500base-x
> -      - 5gbase-r
> -      - rxaui
> -      - xaui
> -
> -      # 10GBASE-KR, XFI, SFI
> -      - 10gbase-kr
> -      - usxgmii
> -      - 10gbase-r
> -      - 25gbase-r
>  
>    phy-mode:
>      $ref: "#/properties/phy-connection-type"
> diff --git a/Documentation/devicetree/bindings/net/ethernet-phy-mode-types.yaml b/Documentation/devicetree/bindings/net/ethernet-phy-mode-types.yaml
> new file mode 100644
> index 000000000000..6d15743b4ffa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/ethernet-phy-mode-types.yaml
> @@ -0,0 +1,132 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/ethernet-phy-mode-types.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ethernet PHY Common Mode Types
> +
> +maintainers:
> +  - David S. Miller <[email-masked]>
> +
> +definitions:

Use '$defs'

'definitions' is special in that we don't process it at all. That's 
probably why you ended up with this overly complicated schema below.

But really, there's no need to use $defs or definitions at all here. 
Just put it under 'properties' And move the references up a level (i.e. 
to the node, not a property).

> +  phy-connection-type:
> +    # const: "internal"
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/string
> +      - oneOf:
> +        # There is not a standard bus between the MAC and the PHY,
> +        # something proprietary is being used to embed the PHY in the
> +        # MAC.
> +        - items:

'items' is for arrays, but you just said this is a 'string', not 
'string-array'. 

> +            - type: string

Already covered by the type $ref.

This can all be expressed with just 1 'enum' as it was before.

> +              const: internal
> +        - items:
> +            - type: string
> +              const: mii
> +        - items:
> +            - type: string
> +              const: gmii
> +        - items:
> +            - type: string
> +              const: sgmii
> +        - items:
> +            - type: string
> +              const: psgmii
> +        - items:
> +            - type: string
> +              const: qsgmii
> +        - items:
> +            - type: string
> +              const: qusgmii
> +        - items:
> +            - type: string
> +              const: tbi
> +        - items:
> +            - type: string
> +              const: rev-mii
> +        - items:
> +            - type: string
> +              const: rmii
> +        - items:
> +            - type: string
> +              const: rev-rmii
> +        - items:
> +            - type: string
> +              const: moca
> +
> +        # RX and TX delays are added by the MAC when required
> +        - items:
> +            - type: string
> +              const: rgmii
> +
> +        # RGMII with internal RX and TX delays provided by the PHY,
> +        # the MAC should not add the RX or TX delays in this case
> +        - items:
> +            - type: string
> +              const: rgmii-id
> +
> +        # RGMII with internal RX delay provided by the PHY, the MAC
> +        # should not add an RX delay in this case
> +        - items:
> +            - type: string
> +              const: rgmii-rxid
> +
> +        # RGMII with internal TX delay provided by the PHY, the MAC
> +        # should not add an TX delay in this case
> +        - items:
> +            - type: string
> +              const: rgmii-txid
> +
> +        - items:
> +            - type: string
> +              const: rtbi
> +
> +        - items:
> +            - type: string
> +              const: smii
> +
> +        - items:
> +            - type: string
> +              const: xgmii
> +
> +        - items:
> +            - type: string
> +              const: trgmii
> +
> +        - items:
> +            - type: string
> +              const: 1000base-x
> +
> +        - items:
> +            - type: string
> +              const: 2500base-x
> +
> +        - items:
> +            - type: string
> +              const: 5gbase-r
> +
> +        - items:
> +            - type: string
> +              const: rxaui
> +
> +        - items:
> +            - type: string
> +              const: xaui
> +
> +        # 10GBASE-KR, XFI, SFI
> +        - items:
> +            - type: string
> +              const: 10gbase-kr
> +
> +        - items:
> +            - type: string
> +              const: usxgmii
> +
> +        - items:
> +            - type: string
> +              const: 10gbase-r
> +
> +        - items:
> +            - type: string
> +              const: 25gbase-r
> -- 
> 2.40.1
>