netdev - Re: SoCFPGA ethernet broken

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Date:	Fri, 16 Oct 2015 09:38:37 -0500
From:	Dinh Nguyen <dinguyen@...nsource.altera.com>
To:	Andrew Lunn <andrew@...n.ch>
CC:	Florian Fainelli <f.fainelli@...il.com>,
	David Daney <ddaney@...iumnetworks.com>,
	"David S. Miller" <davem@...emloft.net>, <david.daney@...ium.com>,
	<netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: SoCFPGA ethernet broken

On Fri, 16 Oct 2015, Andrew Lunn wrote:

> > Another debugging point, the SoCFPGA board has a Micrel ksz9021 PHY attached
> > to the ethernet port. What I'm seeing is that with 8b63ec1837fa patch, when
> > the call to ksz9021_config_init() is made both of_node and dev->parent->of_node
> > are NULL, without the patch the dev->parent->of_node is a valid pointer. Thus
> > the skew values get programmed to the phy.
> 
> Ah!
> 
> You have the phy device tree parameters in the wrong place. These are
> phy paramters, so should really be in the phy node. But
> socfpga_cyclone5_socdk.dts has them in the MAC node.
>

Alright, let me see if I can rework the DTS.
 
> There is nothing in Documentation/devicetree/bindings/net/micrel.txt
> which says you are allowed to place them in the MAC node. Obviously
> the code did allow this, which is what has now broken.
>

I was following Documentation/devicetree/bindings/net/micrel-ksz90x1.txt and
in this document I was following the autodetected PHY example. Did I mis-interpret
the example?

BR,
Dinh
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