netdev - Re: [PATCH v3 net-next 12/14] dt-bindings: net: dsa: ocelot: add ocelot-ext documentation

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Date:   Tue, 4 Oct 2022 13:19:33 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Colin Foster <colin.foster@...advantage.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org
Cc:     Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Lee Jones <lee@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vladimir Oltean <olteanv@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v3 net-next 12/14] dt-bindings: net: dsa: ocelot: add
 ocelot-ext documentation

On 26/09/2022 02:29, Colin Foster wrote:
> The ocelot-ext driver is another sub-device of the Ocelot / Felix driver
> system, which currently supports the four internal copper phys.
> 
> Signed-off-by: Colin Foster <colin.foster@...advantage.com>
> ---
> 
> v3
>     * Remove "currently supported" verbage
>         The Seville and Felix 9959 all list their supported modes following
>         the sentence "The following PHY interface types are supported".
>         During V2, I had used "currently supported" to suggest more interface
>         modes are around the corner, though this had raised questions.
> 
>         The suggestion was to drop the entire sentence. I did leave the
>         modified sentence there because it exactly matches the other two
>         supported products.
> 
> v2
>     * New patch
> 
> ---
>  .../bindings/net/dsa/mscc,ocelot.yaml         | 59 +++++++++++++++++++
>  1 file changed, 59 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/dsa/mscc,ocelot.yaml b/Documentation/devicetree/bindings/net/dsa/mscc,ocelot.yaml
> index 8d93ed9c172c..49450a04e589 100644
> --- a/Documentation/devicetree/bindings/net/dsa/mscc,ocelot.yaml
> +++ b/Documentation/devicetree/bindings/net/dsa/mscc,ocelot.yaml
> @@ -54,9 +54,22 @@ description: |
>        - phy-mode = "1000base-x": on ports 0, 1, 2, 3
>        - phy-mode = "2500base-x": on ports 0, 1, 2, 3
>  
> +  VSC7412 (Ocelot-Ext):
> +
> +    The Ocelot family consists of four devices, the VSC7511, VSC7512, VSC7513,
> +    and the VSC7514. The VSC7513 and VSC7514 both have an internal MIPS
> +    processor that natively support Linux. Additionally, all four devices
> +    support control over external interfaces, SPI and PCIe. The Ocelot-Ext
> +    driver is for the external control portion.
> +
> +    The following PHY interface types are supported:
> +
> +      - phy-mode = "internal": on ports 0, 1, 2, 3
> +
>  properties:
>    compatible:
>      enum:
> +      - mscc,vsc7512-switch
>        - mscc,vsc9953-switch
>        - pci1957,eef0
>  
> @@ -258,3 +271,49 @@ examples:
>              };
>          };
>      };
> +  # Ocelot-ext VSC7512
> +  - |
> +    spi {
> +        soc@0 {

soc in spi is a bit confusing.

Does it even pass the tests? You have unit address but no reg.

> +            compatible = "mscc,vsc7512";


> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +
> +            ethernet-switch@0 {
> +                compatible = "mscc,vsc7512-switch";
> +                reg = <0 0>;

0 is the address on which soc bus?

> +
> +                ethernet-ports {
> +                    #address-cells = <1>;
> +                    #size-cells = <0>;
> +
> +                    port@0 {
> +                        reg = <0>;
> +                        label = "cpu";
> +                        ethernet = <&mac_sw>;
> +                        phy-handle = <&phy0>;
> +                        phy-mode = "internal";
> +                    };
> +
> +                    port@1 {
> +                        reg = <1>;
> +                        label = "swp1";
> +                        phy-mode = "internal";
> +                        phy-handle = <&phy1>;
> +                    };
> +
> +                    port@2 {
> +                        reg = <2>;
> +                        phy-mode = "internal";
> +                        phy-handle = <&phy2>;
> +                    };
> +
> +                    port@3 {
> +                        reg = <3>;
> +                        phy-mode = "internal";
> +                        phy-handle = <&phy3>;
> +                    };

How is this example different than previous one (existing soc example)?
If by compatible and number of ports, then there is no much value here.

> +                };
> +            };
> +        };
> +    };

Best regards,
Krzysztof