[4.2.y-ckt stable] Patch "phy: micrel: Fix finding PHY properties in MAC node." has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    phy: micrel: Fix finding PHY properties in MAC node.

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt1.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 8542cf922990986676ea733ddb7dd24d74b1f6cf Mon Sep 17 00:00:00 2001
From: Andrew Lunn <andrew at lunn.ch>
Date: Wed, 9 Dec 2015 19:56:31 +0100
Subject: phy: micrel: Fix finding PHY properties in MAC node.

[ Upstream commit 651df2183543bc92f5dbcf99cd9e236ead0bc4c5 ]

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 at opensource.altera.com>
Suggested-by: David Daney <david.daney at cavium.com>
Acked-by: David Daney <david.daney at cavium.com>
Fixes: 8b63ec1837fa ("phylib: Make PHYs children of their MDIO bus, not the bus' parent.")
Signed-off-by: Andrew Lunn <andrew at lunn.ch>
Tested-by: Dinh Nguyen <dinguyen at opensource.altera.com>
Acked-by: Florian Fainelli <f.fainelli at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/net/phy/micrel.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 499185e..4bb8149 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -339,9 +339,18 @@ static int ksz9021_config_init(struct phy_device *phydev)
 {
 	const struct device *dev = &phydev->dev;
 	const struct device_node *of_node = dev->of_node;
-
-	if (!of_node && dev->parent->of_node)
-		of_node = dev->parent->of_node;
+	const struct device *dev_walker;
+
+	/* 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,
--
1.9.1