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Date:	Thu, 24 May 2012 11:50:26 -0700
From:	David Daney <>
To:	Timur Tabi <>
CC:	"" 
	"" <>,
	"" <>
Subject: Re: [PATCH v6 0/3] netdev/of/phy: MDIO bus multiplexer support.

On 05/24/2012 11:28 AM, Timur Tabi wrote:
> David Daney wrote:
>> Yes.  You may note in the DTS file I attached in the parent (sorry for
>> the fubar mime types), that there are two, almost identical, MDIO
>> masters.  smi0 has two directly attached PHYs.  smi1 goes to the mux,
>> and each child of the mux has four attached PHYs.
> I'm till have trouble understanding all this.  I'm just hacking things up
> in order to help me understand it, but it's a slow and painful process.
> This call in mdio_mux_init() is failing:
> 	parent_bus = of_mdio_find_bus(parent_bus_node);

Well, the MDIO bus must have an associated device tree node.

For my OCTEON code, the MDIO bus device is created as a result of the 
call to of_platform_bus_probe(), which takes care of filling in all the 
device tree nodes of the devices it finds and creates.

> It returns NULL.  Here is my MDIO node:
> 		fman0: fman@...000 {
> 			enet0: ethernet@...00 {
> 				tbi-handle =<&tbi0>;
> 				phy-handle =<&phy0>;
> 				phy-connection-type = "sgmii";
> 			};
> 			mdio0: mdio@...20 {
> 				gpios =<&gpio0 0 0
> 					&gpio0 1 0>;
> 				tbi0: tbi-phy@8 {
> 					reg =<0x8>;
> 					device_type = "tbi-phy";
> 				};
> 				phy0: ethernet-phy@1c {
> 					reg =<0x1c>;
> 				};
> 			};
> 		};
> What am I missing?

For starters, I do not see any compatible properties that would allow 
the proper drivers to be bound to anything.

Also I see no MDIO mux node there, so it is unclear why you are even 
asking these questions.

David Daney
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