Re: [PATCH net-next v3 1/2] dt-bindings: net: pse-pd: Add bindings for LTC4266 PSE Controller

[Rob Herring <robh@kernel.org>]

On Sun, Sep 27, 2026 at 09:29:48PM +0000, Kyle Swenson wrote:
> Add the LTC4266 Power Sourcing Equipment controller device tree bindings
> documentation.
> 
> Signed-off-by: Kyle Swenson <kyle.swenson@est.tech>
> ---
>  .../bindings/net/pse-pd/lltc,ltc4266.yaml     | 180 ++++++++++++++++++
>  1 file changed, 180 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml b/Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml
> new file mode 100644
> index 000000000000..e11c9d601eee
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml
> @@ -0,0 +1,180 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/pse-pd/lltc,ltc4266.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Linear Technology LTC4266 Power Sourcing Equipment controller
> +
> +maintainers:
> +  - Kyle Swenson <kyle.swenson@est.tech>
> +
> +allOf:
> +  - $ref: pse-controller.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - lltc,ltc4266
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  channels:
> +    type: object
> +    additionalProperties: false
> +    description:
> +      Defines the 4 physical delivery channels on the controller that can be
> +      referenced by PSE PIs through their "pairsets" property. The actual port
> +      matrix mapping is created when PSE PIs reference these channels in their
> +      pairsets.
> +
> +    properties:
> +      '#address-cells':
> +        const: 1
> +
> +      '#size-cells':
> +        const: 0
> +
> +    patternProperties:
> +      '^channel@[0-3]$':
> +        type: object
> +        additionalProperties: false
> +
> +        properties:
> +          reg:
> +            maxItems: 1
> +
> +          sense-resistor-micro-ohms:
> +            description: Sense resistor connected to the channel's MOSFET, used
> +              for current measurement and for overcurrent detection. The I_CUT
> +              and I_LIM register encodings depend on which value is fitted, so
> +              a wrong value programs the wrong thresholds.
> +            enum: [250000, 500000]
> +
> +        required:
> +          - reg
> +          - sense-resistor-micro-ohms
> +
> +    required:
> +      - '#address-cells'
> +      - '#size-cells'
> +
> +  pse-pis:
> +    type: object
> +    additionalProperties: false
> +
> +    properties:
> +      '#address-cells':
> +        const: 1
> +
> +      '#size-cells':
> +        const: 0
> +
> +    patternProperties:
> +      '^pse-pi@[0-3]$':
> +        type: object
> +        additionalProperties: true

This cannot be true. That allows adding any property.

> +        properties:
> +          pairsets:
> +            description: The LTC4266 delivers power to a PI over a single
> +              pairset, driven by one of the controller's four channels. There
> +              is no 4-pair mode spreading a PI over two channels, so exactly
> +              one channel phandle is expected.
> +            maxItems: 1
> +          pairset-names:
> +            maxItems: 1

An empty node is valid? Needs 'required'.

Rob