Re: [PATCH net-next 1/5] dt-bindings: net: add onsemi's TS2500/NCN26010 10BASE-T1S MACPHY

[Rob Herring <robh@kernel.org>]

On Fri, May 01, 2026 at 07:15:17PM +0000, Selvamani Rajagopal wrote:
> Add YAML device tree binding for the onsemi NCN26010 and TS2500
> IEEE 802.3cg compliant Ethernet transceiver devices.
> 
> Signed-off-by: Selvamani Rajagopal <Selvamani.Rajagopal@onsemi.com>
> ---
>  .../bindings/net/onnn,ncn260xx.yaml           | 71 +++++++++++++++++++
>  1 file changed, 71 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/onnn,ncn260xx.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/onnn,ncn260xx.yaml b/Documentation/devicetree/bindings/net/onnn,ncn260xx.yaml
> new file mode 100644
> index 000000000..198cd7e9d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/onnn,ncn260xx.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/onnn,ncn260xx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: onsemi NCN26010/TS2500 10BASE-T1S MACPHY Ethernet Controllers
> +
> +maintainers:
> +  - Piergiorgio Beruto <Pier.Beruto@onsemi.com>
> +  - Selva Rajagopal <Selvamani.Rajagopal@onsemi.com>
> +
> +description: |
> +  The NCN26010 and TS2500 combine a Media Access Controller (MAC) and an
> +  Ethernet PHY to enable 10BASE‑T1S networks. The Ethernet Media Access
> +  Controller (MAC) module implements a 10 Mbps half duplex Ethernet MAC,
> +  compatible with the IEEE 802.3 standard and a 10BASE-T1S physical layer
> +  transceiver integrated into the NCN26010. The communication between
> +  the host and the MAC-PHY is specified in the OPEN Alliance 10BASE-T1x
> +  MACPHY Serial Interface (TC6).
> +
> +  Specifications about the NCN26010 can be found at:
> +    https://www.onsemi.com/download/data-sheet/pdf/ncn26010-d.pdf
> +    https://www.onsemi.com/products/interfaces/ethernet-controllers/t30hm1ts2500
> +
> +allOf:
> +  - $ref: /schemas/net/ethernet-controller.yaml#
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    const: onnn,ncn260xx

Don't use wildcards in compatible strings.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    description: |

Don't need '|'.

> +      Interrupt from MAC-PHY asserted in the event of Receive Chunks
> +      Available, Transmit Chunk Credits Available and Extended Status
> +      Event.
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    minimum: 15000000

A minimum is strange. What if you have a board issue requiring lower 
frequency?

> +    maximum: 25000000
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - spi-max-frequency

Normally this is not required. It's only for boards which can't operate 
at the maximum frequency of the device.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      ethernet@0 {
> +        compatible = "onnn,ncn260xx";
> +        reg = <0>;
> +        pinctrl-names = "default";
> +        interrupt-parent = <&gpio>;
> +        interrupts = <25 2>;
> +        status = "okay";

Drop. Examples are always enabled.

> +        spi-max-frequency = <25000000>;
> +      };
> +    };
> --
> 2.43.0
> 
> 
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