netdev - Re: [PATCH net-next 11/13] net: dsa: sja1105: register the MDIO buses for 100base-T1 and 100base-TX

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Date:   Tue, 25 May 2021 04:18:24 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH net-next 11/13] net: dsa: sja1105: register the MDIO
 buses for 100base-T1 and 100base-TX

On Tue, May 25, 2021 at 02:22:12AM +0300, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> The SJA1110 contains two types of integrated PHYs: one 100base-TX PHY
> and multiple 100base-T1 PHYs.
> 
> The access procedure for the 100base-T1 PHYs is also different than it
> is for the 100base-TX one. So we register 2 MDIO buses, one for the
> base-TX and the other for the base-T1. Each bus has an OF node which is
> a child of the "mdio" subnode of the switch, and they are recognized by
> compatible string.

The mv88e6xxx also can have two MDIO busses. It is however an internal
bus for the internal PHYs and an external bus. The code however
evolved, since earlier devices only had one MDIO i ended up with a
binding like this:

       mdio {
                #address-cells = <1>;
                #size-cells = <0>;
                interrupt-parent = <&gpio0>;
                interrupts = <27 IRQ_TYPE_LEVEL_LOW>;
                interrupt-controller;
                #interrupt-cells = <2>;

                switch0: switch@0 {
                        compatible = "marvell,mv88e6390";
                        reg = <0>;
                        reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;

                        mdio {
                                #address-cells = <1>;
                                #size-cells = <0>;
                                switch1phy0: switch1phy0@0 {
                                        reg = <0>;
                                        interrupt-parent = <&switch0>;
                                        interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
                                };
                        };

                        mdio1 {
                                compatible = "marvell,mv88e6xxx-mdio-external";
                                #address-cells = <1>;
                                #size-cells = <0>;
                                switch1phy9: switch1phy0@9 {
                                        reg = <9>;
                                };
                        };
                };
        };

It however sounds like you have the two busses one level deeper?

It would be good if you document this as part of the binding.

   Andrew