linux-kernel - Re: [PATCH net-next v4 6/7] dt-bindings: net: pse-dt: add bindings for generic PSE controller

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Date:   Tue, 30 Aug 2022 15:10:54 -0500
From:   Rob Herring <robh@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        David Jander <david@...tonic.nl>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next v4 6/7] dt-bindings: net: pse-dt: add bindings
 for generic PSE controller

On Sun, Aug 28, 2022 at 08:30:20AM +0200, Oleksij Rempel wrote:
> Add binding for generic Ethernet PSE controller.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
> changes v4:
> - rename to PSE regulator
> - drop currently unused properties
> - use own compatible for PoDL PSE
> changes v2:
> - rename compatible to more generic "ieee802.3-pse"
> - add class and type properties for PoDL and PoE variants
> - add pairs property
> ---
>  .../bindings/net/pse-pd/pse-regulator.yaml    | 40 +++++++++++++++++++
>  1 file changed, 40 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/pse-pd/pse-regulator.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/pse-pd/pse-regulator.yaml b/Documentation/devicetree/bindings/net/pse-pd/pse-regulator.yaml
> new file mode 100644
> index 0000000000000..1a906d2135a7a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/pse-pd/pse-regulator.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/pse-pd/pse-regulator.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Regulator based Power Sourcing Equipment
> +
> +maintainers:
> +  - Oleksij Rempel <o.rempel@...gutronix.de>
> +
> +description: Regulator based PSE controller. The device must be referenced by
> +  the PHY node to control power injection to the Ethernet cable.
> +
> +properties:
> +  compatible:
> +    description: Regulator based PoDL PSE controller for a single twisted-pair
> +      link.
> +    const: podl-pse-regulator
> +
> +  '#pse-cells':
> +    const: 0

Do you have intentions that this would be non-zero? This series is 
defining a new common binding, but only creating a specific schema. 
You need to define in a common schema what the purpose of the cells may 
be and if there's common constraints defining those in the common 
schema. There's several examples where only 0 or 1 is allowed for 
example.

There's a standard pattern of '#foo-cells' for the provider and 'foos' 
for the consumer. Ultimately, anything that doesn't follow that pattern 
needs explicit support in dtschema to decode the consumers. IOW, try to 
follow the pattern. Either '#ieee802.3-pse-cells'/'ieee802.3-pses' or 
'#pse-cells'/'pses'. Neither seems great to me. The former is a bit too 
specific and the latter a bit too short. Shrug.

Rob