net: mdio-uclass: Bind and probe generic Ethernet PHY driver

If DM_ETH_PHY is enabled then try to bind and probe the
generic Ethernet PHY driver for each child of MDIO bus.

This is to ensure that GPIO reset handling is done if available
before MDIO bus driver scans for the PHYs.

Signed-off-by: Roger Quadros <[email protected]>

net/mdio-uclass.c

@@ -6,6 +6,8 @@
 
 #include <common.h>
 #include <dm.h>
+#include <dm/lists.h>
+#include <eth_phy.h>
 #include <log.h>
 #include <malloc.h>
 #include <miiphy.h>
@@ -121,6 +123,42 @@ static int mdio_reset(struct mii_dev *mii_bus)
 	return dm_mdio_reset(mii_bus->priv);
 }
 
+static int mdio_bind_phy_nodes(struct udevice *mdio_dev)
+{
+	ofnode mdio_node, phy_node;
+	struct udevice *phy_dev;
+	const char *node_name;
+	int ret;
+
+	mdio_node = dev_ofnode(mdio_dev);
+	if (!ofnode_valid(mdio_node)) {
+		dev_dbg(mdio_dev, "invalid ofnode for mdio_dev\n");
+		return -ENXIO;
+	}
+
+	ofnode_for_each_subnode(phy_node, mdio_node) {
+		node_name = ofnode_get_name(phy_node);
+		dev_dbg(mdio_dev, "* Found child node: '%s'\n", node_name);
+		ret = device_bind_driver_to_node(mdio_dev,
+						 "eth_phy_generic_drv",
+						 node_name, phy_node, &phy_dev);
+		if (ret) {
+			dev_dbg(mdio_dev, "  - Eth phy binding error: %d\n", ret);
+			continue;
+		}
+
+		dev_dbg(mdio_dev, "  - bound phy device: '%s'\n", node_name);
+		ret = device_probe(phy_dev);
+		if (ret) {
+			dev_dbg(mdio_dev, "Device '%s' probe failed\n", phy_dev->name);
+			device_unbind(phy_dev);
+			continue;
+		}
+	}
+
+	return 0;
+}
+
 static int dm_mdio_post_probe(struct udevice *dev)
 {
 	struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev);
@@ -154,6 +192,9 @@ static int dm_mdio_post_probe(struct udevice *dev)
 		}
 	}
 
+	if (CONFIG_IS_ENABLED(DM_ETH_PHY))
+		mdio_bind_phy_nodes(dev);
+
 	return mdio_register(pdata->mii_bus);
 }