[PATCH 2/4] net: fec: Allow the PHY node to be retrieved

[Fabio Estevam <festevam@gmail.com>]

As we move towards driver model, it is required to let the FEC driver
know how to properly deal with an Ethernet PHY subnode in the device tree.

For example:

 &fec {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_microsom_enet_ar8035>;
	phy-handle = <&phy>;
 	phy-mode = "rgmii-id";
 	phy-reset-duration = <2>;
 	phy-reset-gpios = <&gpio4 15 GPIO_ACTIVE_LOW>;
 	status = "okay";

	mdio {
		#address-cells = <1>;
		#size-cells = <0>;

		phy: ethernet-phy at 0 {
			reg = <0>;
			qca,clk-out-frequency = <125000000>;
		};
	};
 };

Currently the PHY node pointer is incorrectly associated with the
Ethernel controller instead of the PHY node itself. 

This causes the PHY properties, such as "qca,clk-out-frequency" in
the example above to not get parsed.

Fix this problem by populating the phy_of_node node.

Suggested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
---
 drivers/net/fec_mxc.c | 7 +++++--
 drivers/net/fec_mxc.h | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c
index 9ae2db033e..992180df86 100644
--- a/drivers/net/fec_mxc.c
+++ b/drivers/net/fec_mxc.c
@@ -1294,7 +1294,7 @@ static const struct eth_ops fecmxc_ops = {
 	.read_rom_hwaddr	= fecmxc_read_rom_hwaddr,
 };
 
-static int device_get_phy_addr(struct udevice *dev)
+static int device_get_phy_addr(struct fec_priv *priv, struct udevice *dev)
 {
 	struct ofnode_phandle_args phandle_args;
 	int reg;
@@ -1305,6 +1305,8 @@ static int device_get_phy_addr(struct udevice *dev)
 		return -ENODEV;
 	}
 
+	priv->phy_of_node = phandle_args.node;
+
 	reg = ofnode_read_u32_default(phandle_args.node, "reg", 0);
 
 	return reg;
@@ -1315,7 +1317,7 @@ static int fec_phy_init(struct fec_priv *priv, struct udevice *dev)
 	struct phy_device *phydev;
 	int addr;
 
-	addr = device_get_phy_addr(dev);
+	addr = device_get_phy_addr(priv, dev);
 #ifdef CONFIG_FEC_MXC_PHYADDR
 	addr = CONFIG_FEC_MXC_PHYADDR;
 #endif
@@ -1325,6 +1327,7 @@ static int fec_phy_init(struct fec_priv *priv, struct udevice *dev)
 		return -ENODEV;
 
 	priv->phydev = phydev;
+	priv->phydev->node = priv->phy_of_node;
 	phy_config(phydev);
 
 	return 0;
diff --git a/drivers/net/fec_mxc.h b/drivers/net/fec_mxc.h
index 0e8f08a51a..659d62646f 100644
--- a/drivers/net/fec_mxc.h
+++ b/drivers/net/fec_mxc.h
@@ -250,6 +250,7 @@ struct fec_priv {
 	struct mii_dev *bus;
 #ifdef CONFIG_PHYLIB
 	struct phy_device *phydev;
+	ofnode phy_of_node;
 #else
 	int phy_id;
 	int (*mii_postcall)(int);
-- 
2.17.1