[PATCH 3/4] net: mdio: teach dm_eth_phy_connect to connect to fixed PHY

[Vladimir Oltean <olteanv@gmail.com>]

From: Vladimir Oltean <vladimir.oltean@nxp.com>

It would be desirable for top-level callers of PHYLIB to deal with as
little complexity as possible, and when they call dm_eth_phy_connect,
they get a struct phy_device that "just works".

There is a phy_connect_fixed interception put in phy_connect, however
dm_eth_phy_connect will not reach there: if will search for a phy-handle
all by itself, and error out if there isn't one. So we can make callers
of dm_eth_phy_connect suffer by having them call:

	err = dm_eth_phy_connect();
	if (err)
		err = dm_eth_phy_connect_fixed();

or we can just add the logic in dm_eth_phy_connect() that searches for a
fixed-link before searching for a phy-handle.

In fact we already have an in-tree driver that can make use of this
refactoring: the Freescale TSEC driver.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 drivers/net/tsec.c |  6 +-----
 net/mdio-uclass.c  | 12 ++++++++++--
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/net/tsec.c b/drivers/net/tsec.c
index ec4868937257..f801d020fb65 100644
--- a/drivers/net/tsec.c
+++ b/drivers/net/tsec.c
@@ -707,11 +707,7 @@ static int init_phy(struct tsec_private *priv)
 		tsec_configure_serdes(priv);
 
 #if defined(CONFIG_DM_ETH) && defined(CONFIG_DM_MDIO)
-	if (ofnode_valid(ofnode_find_subnode(dev_ofnode(priv->dev),
-					     "fixed-link")))
-		phydev = phy_connect(NULL, 0, priv->dev, priv->interface);
-	else
-		phydev = dm_eth_phy_connect(priv->dev);
+	phydev = dm_eth_phy_connect(priv->dev);
 #else
 	phydev = phy_connect(priv->bus, priv->phyaddr, priv->dev,
 			     priv->interface);
diff --git a/net/mdio-uclass.c b/net/mdio-uclass.c
index 697e5f838d94..766d4711cc23 100644
--- a/net/mdio-uclass.c
+++ b/net/mdio-uclass.c
@@ -177,9 +177,10 @@ static struct phy_device *dm_eth_connect_phy_handle(struct udevice *ethdev,
 /* Connect to a PHY linked in eth DT node */
 struct phy_device *dm_eth_phy_connect(struct udevice *ethdev)
 {
-	const char *if_str;
+	ofnode node = dev_ofnode(ethdev), subnode;
 	phy_interface_t interface;
 	struct phy_device *phy;
+	const char *if_str;
 	int i;
 
 	if (!dev_has_ofnode(ethdev)) {
@@ -200,7 +201,14 @@ struct phy_device *dm_eth_phy_connect(struct udevice *ethdev)
 	if (interface == PHY_INTERFACE_MODE_NONE)
 		dev_dbg(ethdev, "can't find interface mode, default to NONE\n");
 
-	phy = dm_eth_connect_phy_handle(ethdev, interface);
+	subnode = ofnode_find_subnode(node, "fixed-link");
+	if (ofnode_valid(subnode)) {
+		phy = phy_connect(NULL, 0, ethdev, interface);
+		if (phy)
+			phy->node = subnode;
+	} else {
+		phy = dm_eth_connect_phy_handle(ethdev, interface);
+	}
 
 	if (!phy)
 		return NULL;
-- 
2.25.1