# Re: \[PATCH 2/2\] powerpc/85xx: add Fman MDIO muxing support to the P4080DS

- From: Timur Tabi \<hidden\>
- Date: 2012-08-14 21:48:58 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2012/08/9470807
- Thread: https://ratatoskr.run/netdev/2012/08/9470781/t.md

```text
Kumar Gala wrote:
>> > +	{
>> > +		/*
>> > +		 * Warning: this entry might need to be located before those
>> > +		 * for the Fman Ethernet nodes.
>> > +		 */
>> > +		.compatible	= "mdio-mux",
>> > +	},
>> > 	{}
>> > };
> Under what condition would that be the case?

We had this discussion already.  In my tests, I had to locate this entry
before these entries:

	{
		.compatible	= "fsl,dpaa"
	},
	{
		.compatible	= "fsl,srio",
	},

otherwise, the mdio-mux code would not prepare the mdio mus in time, and
there would be initialization failures.  Now maybe this goes away with
-EPROBE_DEFER, or maybe it doesn't.  But until we push the DPAA drivers
upstream, we won't know.

-- 
Timur Tabi
Linux kernel developer at Freescale
```