netdev - Re: [PATCH] net/phy: micrel: Follow attached

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Date:	Sun, 18 Oct 2015 00:54:07 -0500
From:	Dinh Nguyen <dinguyen@...nsource.altera.com>
To:	Andrew Lunn <andrew@...n.ch>
CC:	Florian Fainelli <f.fainelli@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] net/phy: micrel: Follow attached_dev to get to the MAC
 device

On Sat, 17 Oct 2015, Dinh Nguyen wrote:

> On Sat, 17 Oct 2015, Andrew Lunn wrote:
> 
> > > Sure, will try to debug. It looks like phydev->attached_dev is valid, but
> > > phydev->attached_dev->dev.of_node is NULL.
> > 
> > Humm
> > 
> > phydev->attached_dev is a net_device, so should be the mac.  What
> > device is phydev->attached_dev->dev? Is it not the dev embedded in the
> > platform_device passed to socfpga_dwmac_probe()?
> >
> 
> Yes, it looks like it is, the dev->of_node is valid in socfpga_dwmac_probe(),
> but it looks like of_node is getting lost somewhere. 
> 

Do you know why this happening? In ksz9021_config_init():

@@ -345,7 +345,11 @@ static int ksz9021_config_init(struct phy_device *phydev)
            phydev->attached_dev->dev.of_node)
                of_node = phydev->attached_dev->dev.of_node;

+	printk("%s %08x\n", __func__, phydev->attached_dev->dev.of_node);
+       printk("%s %08x %08x\n", __func__, phydev->attached_dev->dev, phydev->attached_dev->dev.of_node);


[    1.923311] ksz9021_config_init 00000000
[    1.927224] ksz9021_config_init eedc0210 ee401680

The first printout shows phydev->attached_dev->dev.of_node is NULL. but the
second printout, where I'm also printing out phydev->attached_dev->dev, then
phydev->attached_dev->dev.of_node is not NULL.

BR,
Dinh
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