linux-kernel - Re: [PATCH net-next v3 10/17] dt-bindings: net: pse-pd: Add another way of describing several PSE PIs

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Date: Fri, 9 Feb 2024 14:43:49 +0000
From: Rob Herring <robh@...nel.org>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Russ Weight <russ.weight@...ux.dev>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Mark Brown <broonie@...nel.org>,
	Frank Rowand <frowand.list@...il.com>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
	Dent Project <dentproject@...uxfoundation.org>
Subject: Re: [PATCH net-next v3 10/17] dt-bindings: net: pse-pd: Add another
 way of describing several PSE PIs

On Thu, Feb 08, 2024 at 02:08:47PM +0100, Kory Maincent wrote:
> Before hand we set "#pse-cell" to 1 to define a PSE controller with

#pse-cells

> several PIs (Power Interface). The drawback of this was that we could not
> have any information on the PI except its number.

Then increase it to what you need. The whole point of #foo-cells is that 
it is variable depending on what the provider needs. 

> Add support for pse_pis and pse_pi node to be able to have more information
> on the PI like the number of pairset used and the pairset pinout.

Please explain the problem you are trying to solve, not your solution. I 
don't understand what the problem is to provide any useful suggestions 
on the design.

> 
> Sponsored-by: Dent Project <dentproject@...uxfoundation.org>

Is this a recognized tag? First I've seen it.

> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
> ---
> 
> Changes in v3:
> - New patch
> ---
>  .../bindings/net/pse-pd/pse-controller.yaml        | 101 ++++++++++++++++++++-
>  1 file changed, 98 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml b/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml
> index 2d382faca0e6..dd5fb53e527a 100644
> --- a/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml
> +++ b/Documentation/devicetree/bindings/net/pse-pd/pse-controller.yaml
> @@ -13,6 +13,7 @@ description: Binding for the Power Sourcing Equipment (PSE) as defined in the
>  
>  maintainers:
>    - Oleksij Rempel <o.rempel@...gutronix.de>
> +  - Kory Maincent <kory.maincent@...tlin.com>
>  
>  properties:
>    $nodename:
> @@ -22,11 +23,105 @@ properties:
>      description:
>        Used to uniquely identify a PSE instance within an IC. Will be
>        0 on PSE nodes with only a single output and at least 1 on nodes
> -      controlling several outputs.
> +      controlling several outputs which are not described in the pse_pis
> +      subnode. This property is deprecated, please use pse_pis instead.
>      enum: [0, 1]
>  
> -required:
> -  - "#pse-cells"
> +  pse_pis:
> +    $ref: "#/$defs/pse_pis"
> +
> +$defs:

$defs is for when you need multiple copies of the same thing. I don't 
see that here.

> +  pse_pis:
> +    type: object
> +    description:
> +      Kind of a matrix to identify the concordance between a PSE Power
> +      Interface and one or two (PoE4) physical ports.
> +
> +    properties:
> +      "#address-cells":
> +        const: 1
> +
> +      "#size-cells":
> +        const: 0
> +
> +    patternProperties:
> +      "^pse_pi@[0-9]+$":

Unit-addresses are hex.

> +        $ref: "#/$defs/pse_pi"
> +
> +    required:
> +      - "#address-cells"
> +      - "#size-cells"
> +
> +  pse_pi:
> +    description:
> +      PSE PI device for power delivery via pairsets, compliant with IEEE
> +      802.3-2022, Section 145.2.4. Each pairset comprises a positive and a
> +      negative VPSE pair, adhering to the pinout configurations detailed in
> +      the standard.
> +    type: object
> +    properties:
> +      reg:
> +        maxItems: 1

As you are defining the addressing here, you need to define what the 
"addresses" are.

> +
> +      "#pse-cells":
> +        const: 0
> +
> +      pairset-names:
> +        description:
> +          Names of the pairsets as per IEEE 802.3-2022, Section 145.2.4. Valid
> +          values are "alternative-a" and "alternative-b". Each name should
> +          correspond to a phandle in the 'pairset' property pointing to the
> +          power supply for that pairset.
> +        $ref: /schemas/types.yaml#/definitions/string-array
> +        minItems: 1
> +        maxItems: 2
> +        items:
> +          - enum:
> +            - "alternative-a"
> +            - "alternative-b"

This leaves the 2nd entry undefined. You need the dictionary form of 
'items' rather than a list. IOW, Drop the '-' under items.

> +
> +      pairsets:
> +        description:
> +          List of phandles, each pointing to the power supply for the
> +          corresponding pairset named in 'pairset-names'. This property aligns
> +          with IEEE 802.3-2022, Section 33.2.3 and 145.2.4.
> +          PSE Pinout Alternatives (as per IEEE 802.3-2022 Table 145–3)
> +          | Conductor | Alternative A (MDI-X) | Alternative A (MDI) | Alternative B(X) | Alternative B(S) |
> +          |-----------|-----------------------|---------------------|------------------|------------------|
> +          | 1         | Negative VPSE         | Positive VPSE       | —                | —                |
> +          | 2         | Negative VPSE         | Positive VPSE       | —                | —                |
> +          | 3         | Positive VPSE         | Negative VPSE       | —                | —                |
> +          | 4         | —                     | —                   | Negative VPSE    | Positive VPSE    |
> +          | 5         | —                     | —                   | Negative VPSE    | Positive VPSE    |
> +          | 6         | Positive VPSE         | Negative VPSE       | —                | —                |
> +          | 7         | —                     | —                   | Positive VPSE    | Negative VPSE    |
> +          | 8         | —                     | —                   | Positive VPSE    | Negative VPSE    |
> +        $ref: /schemas/types.yaml#/definitions/phandle-array
> +        minItems: 1
> +        maxItems: 2
> +
> +    required:
> +      - reg
> +      - "#pse-cells"
> +      - pairset-names
> +      - pairsets
> +
> +allOf:
> +  - if:
> +      required:
> +        - "#pse-cells"
> +    then:
> +      not:
> +        required:
> +          - pse-pis
> +
> +  - if:
> +      required:
> +        - pse-pis
> +    then:
> +      not:
> +        required:
> +          - "#pse-cells"
>  
>  additionalProperties: true
>  
> 
> -- 
> 2.25.1
>