netdev - Re: [PATCH net-next 2/5] dt-bindings: net: Add tsnep Ethernet controller

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Message-ID: <CAL_JsqLe0XScBgCJ+or=QdnnUGp36cyxr17BhKrirbkZ_nrxkA@mail.gmail.com>
Date:   Mon, 26 Jul 2021 17:35:26 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Gerhard Engleder <gerhard@...leder-embedded.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        netdev <netdev@...r.kernel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH net-next 2/5] dt-bindings: net: Add tsnep Ethernet controller

On Mon, Jul 26, 2021 at 1:46 PM Gerhard Engleder
<gerhard@...leder-embedded.com> wrote:
>
> The TSN endpoint Ethernet MAC is a FPGA based network device for
> real-time communication.
>
> It is integrated as normal Ethernet controller with
> ethernet-controller.yaml and ethernet-phy.yaml.
>
> Signed-off-by: Gerhard Engleder <gerhard@...leder-embedded.com>
> ---
>  .../bindings/net/engleder,tsnep.yaml          | 77 +++++++++++++++++++
>  1 file changed, 77 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/engleder,tsnep.yaml
>
> diff --git a/Documentation/devicetree/bindings/net/engleder,tsnep.yaml b/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
> new file mode 100644
> index 000000000000..ef2ca45d36a0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/engleder,tsnep.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/engleder,tsnep.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TSN endpoint Ethernet MAC binding
> +
> +maintainers:
> +  - Gerhard Engleder <gerhard@...leder-embedded.com>
> +
> +allOf:
> +  - $ref: ethernet-controller.yaml#
> +
> +properties:
> +  compatible:
> +    oneOf:

Don't need oneOf when there is only one entry.

> +      - enum:
> +        - engleder,tsnep

tsnep is pretty generic. Only 1 version ever? Or differences are/will
be discoverable by other means.

> +
> +  reg: true

How many? And what is each entry if more than 1.

> +  interrupts: true

How many?

> +
> +  local-mac-address: true
> +  mac-address: true
> +  nvmem-cells: true

How many?

> +  nvmem-cells-names: true

Need to define the names.

> +
> +  phy-connection-type: true
> +  phy-mode: true

All the modes the generic binding support are supported by this device?

> +
> +  phy-handle: true
> +
> +  '#address-cells':
> +    description: Number of address cells for the MDIO bus.

No need to re-describe common properties unless you have something
special to say.

Anyway, put an MDIO bus under an 'mdio' node.

> +    const: 1
> +
> +  '#size-cells':
> +    description: Number of size cells on the MDIO bus.
> +    const: 0
> +
> +patternProperties:
> +  "^ethernet-phy@[0-9a-f]$":
> +    type: object
> +    $ref: ethernet-phy.yaml#

Referencing mdio.yaml will do all this.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - phy-mode
> +  - phy-handle
> +  - '#address-cells'
> +  - '#size-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    axi {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +        tnsep0: ethernet@...00000 {
> +            compatible = "engleder,tsnep";
> +            reg = <0x0 0xa0000000 0x0 0x10000>;
> +            interrupts = <0 89 1>;
> +            interrupt-parent = <&gic>;
> +            local-mac-address = [00 00 00 00 00 00];
> +            phy-mode = "rgmii";
> +            phy-handle = <&phy0>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            phy0: ethernet-phy@1 {
> +                reg = <1>;
> +            };
> +        };
> +    };
> --
> 2.20.1
>