linux-kernel - [PATCH v1 2/2] net: ftgmac100: add handling of mdio/phy nodes for ast2400/2500

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Date:   Thu, 15 Oct 2020 15:49:17 +0300
From:   Ivan Mikhaylov <i.mikhaylov@...ro.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Po-Yu Chuang <ratbert@...aday-tech.com>
CC:     Ivan Mikhaylov <i.mikhaylov@...ro.com>,
        Joel Stanley <joel@....id.au>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <openbmc@...ts.ozlabs.org>
Subject: [PATCH v1 2/2] net: ftgmac100: add handling of mdio/phy nodes for ast2400/2500

phy-handle can't be handled well for ast2400/2500 which has an embedded
MDIO controller. Add ftgmac100_mdio_setup for ast2400/2500 and initialize
PHYs from mdio child node with of_mdiobus_register.

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>
---
 drivers/net/ethernet/faraday/ftgmac100.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 6997e121824b..e32066519ec1 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1638,6 +1638,7 @@ static int ftgmac100_setup_mdio(struct net_device *netdev)
 	struct ftgmac100 *priv = netdev_priv(netdev);
 	struct platform_device *pdev = to_platform_device(priv->dev);
 	struct device_node *np = pdev->dev.of_node;
+	struct device_node *mdio_np;
 	int i, err = 0;
 	u32 reg;
 
@@ -1669,12 +1670,20 @@ static int ftgmac100_setup_mdio(struct net_device *netdev)
 	for (i = 0; i < PHY_MAX_ADDR; i++)
 		priv->mii_bus->irq[i] = PHY_POLL;
 
-	err = mdiobus_register(priv->mii_bus);
+	mdio_np = of_get_child_by_name(np, "mdio");
+	if (mdio_np)
+		err = of_mdiobus_register(priv->mii_bus, mdio_np);
+	else
+		err = mdiobus_register(priv->mii_bus);
+
 	if (err) {
 		dev_err(priv->dev, "Cannot register MDIO bus!\n");
 		goto err_register_mdiobus;
 	}
 
+	if (mdio_np)
+		of_node_put(mdio_np);
+
 	return 0;
 
 err_register_mdiobus:
@@ -1830,10 +1839,23 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	} else if (np && of_get_property(np, "phy-handle", NULL)) {
 		struct phy_device *phy;
 
+		/* Support "mdio"/"phy" child nodes for ast2400/2500 with
+		 * an embedded MDIO controller. Automatically scan the DTS for
+		 * available PHYs and register them.
+		 */
+		if (of_device_is_compatible(np, "aspeed,ast2400-mac") ||
+		    of_device_is_compatible(np, "aspeed,ast2500-mac")) {
+			err = ftgmac100_setup_mdio(netdev);
+			if (err)
+				goto err_setup_mdio;
+		}
+
 		phy = of_phy_get_and_connect(priv->netdev, np,
 					     &ftgmac100_adjust_link);
 		if (!phy) {
 			dev_err(&pdev->dev, "Failed to connect to phy\n");
+			if (priv->mii_bus)
+				mdiobus_unregister(priv->mii_bus);
 			goto err_setup_mdio;
 		}
 
-- 
2.21.1