From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Lunn <andrew@lunn.ch>
Subject: Re: Device Tree Binding for Marvell DSA Switch on imx28 board over
 Mdio Interface
Date: Mon, 17 Nov 2014 17:09:34 +0100
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Cc: netdev@vger.kernel.org, andrew@lunn.ch,
	Florian Fainelli <f.fainelli@gmail.com>, buytenh@wantstofly.org
To: Oliver Graute <oliver.graute@gmail.com>
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> dsa@0 {
>         compatible = "marvell,dsa";
>         #address-cells = <2>;
>         #size-cells = <0>;
> 
>         interrupts = <10>;
>         //dsa,ethernet = <&ethphy1>;
>         //dsa,ethernet = <&eth1>;
>         dsa,ethernet = <&mac1>;
>         //dsa,ethernet = <&mac0>;
>         dsa,mii-bus = <&mdio_bus>;
> 
>         switch@0 {
>             #address-cells = <1>;
>             #size-cells = <0>;
>             reg = <5 0>;   /* MDIO address 5, switch 0 in tree */

Hi Oliver

How do you have the strapping pins on the switch set? They determine
what address on the mdio bus the chip responds to.

Does your u-boot have commands to read arbitrary phy registers?
Generally, reading a register that does not exist gives 0xffff.  So
try some reads at different addresses and see what you can find.

    Andrew