netdev - Re: [PATCH net-next v5 2/6] dt-bindings: net: Brcm ASP 2.0 Ethernet controller

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Date: Wed, 31 May 2023 21:18:06 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Justin Chen <justin.chen@...adcom.com>, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, bcm-kernel-feedback-list@...adcom.com
Cc: florian.fainelli@...adcom.com, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, opendmb@...il.com,
 andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
 richardcochran@...il.com, sumit.semwal@...aro.org, christian.koenig@....com,
 simon.horman@...igine.com
Subject: Re: [PATCH net-next v5 2/6] dt-bindings: net: Brcm ASP 2.0 Ethernet
 controller

On 25/05/2023 01:01, Justin Chen wrote:
> From: Florian Fainelli <florian.fainelli@...adcom.com>
> 
> Add a binding document for the Broadcom ASP 2.0 Ethernet
> controller.
> 
> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
> Signed-off-by: Justin Chen <justin.chen@...adcom.com>
> ---
> v5
> 	- Fix compatible string yaml format to properly capture what we want
> 
> v4
>         - Adjust compatible string example to reference SoC and HW ver
> 
> v3
>         - Minor formatting issues
>         - Change channel prop to brcm,channel for vendor specific format
>         - Removed redundant v2.0 from compat string
>         - Fix ranges field
> 
> v2
>         - Minor formatting issues
> 
>  .../devicetree/bindings/net/brcm,asp-v2.0.yaml     | 149 +++++++++++++++++++++
>  1 file changed, 149 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/brcm,asp-v2.0.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/brcm,asp-v2.0.yaml b/Documentation/devicetree/bindings/net/brcm,asp-v2.0.yaml
> new file mode 100644
> index 000000000000..c4cd24492bfd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/brcm,asp-v2.0.yaml
> @@ -0,0 +1,149 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/brcm,asp-v2.0.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom ASP 2.0 Ethernet controller
> +
> +maintainers:
> +  - Justin Chen <justin.chen@...adcom.com>
> +  - Florian Fainelli <florian.fainelli@...adcom.com>
> +
> +description: Broadcom Ethernet controller first introduced with 72165
> +
> +properties:
> +  '#address-cells':

Judging by more comments, there will be a v6, thus please also use
consistent quotes - either ' or ".

> +    const: 1
> +  '#size-cells':
> +    const: 1
> +
> +  compatible:

As Conor pointed out, compatible is always first.

> +    oneOf:
> +      - items:
> +          - enum:
> +              - brcm,bcm74165-asp
> +          - const: brcm,asp-v2.1
> +      - items:
> +          - enum:
> +              - brcm,bcm72165-asp
> +          - const: brcm,asp-v2.0
> +
> +  reg:
> +    maxItems: 1
> +
> +  ranges: true
> +
> +  interrupts:
> +    minItems: 1
> +    items:
> +      - description: RX/TX interrupt
> +      - description: Port 0 Wake-on-LAN
> +      - description: Port 1 Wake-on-LAN
> +
> +  clocks:
> +    maxItems: 1
> +
> +  ethernet-ports:
> +    type: object
> +    properties:
> +      '#address-cells':
> +        const: 1
> +      '#size-cells':
> +        const: 0
> +
> +    patternProperties:
> +      "^port@[0-9]+$":
> +        type: object
> +
> +        $ref: ethernet-controller.yaml#
> +
> +        properties:
> +          reg:
> +            maxItems: 1
> +            description: Port number
> +
> +          brcm,channel:
> +            $ref: /schemas/types.yaml#/definitions/uint32
> +            description: ASP channel number

Why do you need it? reg defines it. Your description does not explain
here much, except copying property name. Can we please avoid
descriptions which just copy name?

> +
> +        required:
> +          - reg
> +          - brcm,channel
> +
> +    additionalProperties: false
> +
> +patternProperties:
> +  "^mdio@[0-9a-f]+$":

Isn't mdio a property of each ethernet port? Existing users
(e.g.bcmgenet, owl-emac, switches) do it that way...

Otherwise how do you define relation-ship? Can one mdio fit multiple ports?


> +    type: object
> +    $ref: brcm,unimac-mdio.yaml
> +
> +    description:
> +      ASP internal UniMAC MDIO bus
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks


Best regards,
Krzysztof