netdev - [PATCH net] phy: micrel: Fix finding PHY properties in MAC node.

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Message-Id: <1449686226-14834-1-git-send-email-andrew@lunn.ch>
Date:	Wed,  9 Dec 2015 19:37:06 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	dinguyen@...nsource.altera.com, david.daney@...ium.com,
	Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net] phy: micrel: Fix finding PHY properties in MAC node.

commit 8b63ec1837fa ("phylib: Make PHYs children of their MDIO bus,
not the bus' parent.")  changed the parenting of PHY devices, making
them a child of the MDIO bus, instead of the MAC device. This broken
the Micrel PHY driver which has a deprecated feature of allowing PHY
properties to be placed into the MAC node.

In order to find the MAC node, we need to walk up the tree of devices
until we find one with an OF node attached.

Reported-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
Suggested-by: David Daney <david.daney@...ium.com>
Fixes: 8b63ec1837fa ("phylib: Make PHYs children of their MDIO bus, not the bus' parent.")
Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/phy/micrel.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index cf6312fafea5..2493d7c035f2 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 +340,18 @@ 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;
+	/* The Micrel driver has a deprecated option to place phy OF
+	 * properties in the MAC node. Walk up the tree of devices to
+	 * find a device with an OF node.
+	 */
+	dev_walker = &phydev->dev;
+	do {
+		of_node = 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,
-- 
2.6.2

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