linux-kernel - Re: SoCFPGA ethernet broken

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Date:	Fri, 4 Dec 2015 02:50:57 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Dinh Nguyen <dinguyen@...nsource.altera.com>
Cc:	David Daney <ddaney@...iumnetworks.com>,
	Pavel Machek <pavel@...x.de>,
	Florian Fainelli <f.fainelli@...il.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, Dec 04, 2015 at 02:10:50AM +0100, Andrew Lunn wrote:
> > > FWIW: My initial patch to address the failure worked with the original DTB.
> > 
> > Can I ask what patch are you referring to? I was sidetracked for a while
> > on this issue, but I still see it failing as of v4.4-rc3. I'll try to
> > get back to debugging this.
> 
> Hi Dinh
> 
> There are two different patches:
> 
> https://lkml.org/lkml/2015/10/16/669
> 
> and
> 
> https://www.mail-archive.com/netdev@vger.kernel.org/msg83183.html
> 
> Although the first one works, it keeps searching up and up and up, so
> you could in theory put the phy properties a lot higher than the MAC.
> 
> The second patch restricts where it looks for the phy properties to
> only the MAC. But it does not work. We would like to understand why it
> does not work.

Hi Dinh

Please could you run this patch and let us know what it outputs.

Thanks
	Andrew

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index cf6312fafea5..d7ddc0bb0e7f 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -26,6 +26,7 @@
 #include <linux/module.h>
 #include <linux/phy.h>
 #include <linux/micrel_phy.h>
+#include <linux/netdevice.h>
 #include <linux/of.h>
 #include <linux/clk.h>
 
@@ -339,9 +340,19 @@ static int ksz9021_config_init(struct phy_device *phydev)
 {
 	const struct device *dev = &phydev->dev;
 	const struct device_node *of_node = dev->of_node;
+	const struct device *dev_walker;
 
-	if (!of_node && dev->parent->of_node)
-		of_node = dev->parent->of_node;
+	dev_info(dev, "dev->parent: %s\n", dev_name(dev->parent));
+	dev_info(dev, "phydev->attached_dev->dev: %s\n", dev_name(&phydev->attached_dev->dev));
+
+	dev_walker = &phydev->dev;
+	do {
+		of_node = dev_walker->of_node;
+		dev_info(dev, "walking: %s %p\n",
+			 dev_name(dev_walker), of_node);
+		dev_walker = dev_walker->parent;
+
+	} while (!of_node && dev_walker);
 
 	if (of_node) {
 		ksz9021_load_values_from_of(phydev, of_node,
--
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