From 89b5bd54c1a425e416d67ce21b0fd5fd7da6a1d4 Mon Sep 17 00:00:00 2001
From: Fabio Estevam <festevam@gmail.com>
Date: Thu, 18 Jun 2020 20:21:18 -0300
Subject: [PATCH] net: fec: Allow the PHY node to be retrieved

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@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>
Tested-by: Tom Rini <trini@konsulko.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);