netdev - Re: [PATCH net-next 1/8] dt-bindings: net: dsa: dt bindings for microchip lan937x

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Date:   Sat, 30 Jan 2021 04:02:27 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Prasanna Vengateshan <prasanna.vengateshan@...rochip.com>
Cc:     andrew@...n.ch, netdev@...r.kernel.org, robh+dt@...nel.org,
        kuba@...nel.org, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, UNGLinuxDriver@...rochip.com,
        Woojung.Huh@...rochip.com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH net-next 1/8] dt-bindings: net: dsa: dt bindings for
 microchip lan937x

On Thu, Jan 28, 2021 at 12:11:05PM +0530, Prasanna Vengateshan wrote:
> +  spi-max-frequency:
> +    maximum: 50000000

And it actually works at 50 MHz? Cool.

> +
> +  reset-gpios:
> +    description: Optional gpio specifier for a reset line
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    //Ethernet switch connected via spi to the host, CPU port wired to eth1
> +    eth1 {

So if you do bother to add the DSA master in the example, can this be
&eth1 so that we could associate with the phandle below?

> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      fixed-link {
> +        speed = <1000>;
> +        full-duplex;
> +      };
> +    };
> +
> +    spi1 {

Is this a label or a node name? spi1 or spi@1?

> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      pinctrl-0 = <&pinctrl_spi_ksz>;
> +      cs-gpios = <0>, <0>, <0>, <&pioC 28 0>;
> +      id = <1>;

I know this is the SPI controller and thus mostly irrelevant, but what
is "id = <1>"?

> +
> +      lan9374: switch@0 {
> +        compatible = "microchip,lan9374";
> +        reg = <0>;
> +
> +        spi-max-frequency = <44000000>;
> +
> +        ethernet-ports {
> +          #address-cells = <1>;
> +          #size-cells = <0>;
> +          port@0 {
> +            reg = <0>;
> +            label = "lan1";
> +          };
> +          port@1 {
> +            reg = <1>;
> +            label = "lan2";
> +          };
> +          port@2 {
> +            reg = <7>;

reg should match node index (port@2), here and everywhere below. As for
the net device labels, I'm not sure if the mismatch is deliberate there.

> +            label = "lan3";
> +          };
> +          port@3 {
> +            reg = <2>;
> +            label = "lan4";
> +          };
> +          port@4 {
> +            reg = <6>;
> +            label = "lan5";
> +          };
> +          port@5 {
> +            reg = <3>;
> +            label = "lan6";
> +          };
> +          port@6 {
> +            reg = <4>;
> +            label = "cpu";

label for CPU port is not needed/used.

> +            ethernet = <&eth1>;
> +            fixed-link {
> +              speed = <1000>;
> +              full-duplex;
> +            };
> +          };
> +          port@7 {
> +            reg = <5>;
> +            label = "lan7";
> +            fixed-link {
> +              speed = <1000>;
> +              full-duplex;
> +            };
> +          };
> +        };
> +      };
> +    };