Merge branch 'add-ast2400-2500-phy-handle-support'

Ivan Mikhaylov says:

====================
add ast2400/2500 phy-handle support

This patch introduces ast2400/2500 phy-handle support with an embedded
MDIO controller. At the current moment it is not possible to set options
with this format on ast2400/2500:

mac {
	phy-handle = <&phy>;
	phy-mode = "rgmii";

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

		phy: ethernet-phy@0 {
			compatible = "ethernet-phy-idxxxx.yyyy";
			reg = <0>;
		};
	};
};

The patch fixes it and gets possible PHYs and register them with
of_mdiobus_register.

Changes from v3:
   1. add dt-bindings description of MDIO node and phy-handle option
      with example.

Changes from v2:
   1. change manual phy interface type check on phy_interface_mode_is_rgmii
      function.
   2. add err_phy_connect label.
   3. split ftgmac100_destroy_mdio into ftgmac100_phy_disconnect and
      ftgmac100_destroy_mdio.
   4. remove unneeded mdio_np checks.

Changes from v1:
   1. split one patch into two.
====================

Link: https://lore.kernel.org/r/20201030133707.12099-1-i.mikhaylov@yadro.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/devicetree/bindings/net/ftgmac100.txt

@@ -15,6 +15,7 @@ Required properties:
 - interrupts: Should contain ethernet controller interrupt
 
 Optional properties:
+- phy-handle: See ethernet.txt file in the same directory.
 - phy-mode: See ethernet.txt file in the same directory. If the property is
   absent, "rgmii" is assumed. Supported values are "rgmii*" and "rmii" for
   aspeed parts. Other (unknown) parts will accept any value.
@@ -32,6 +33,9 @@ Optional properties:
       - "MACCLK": The MAC IP clock
       - "RCLK": Clock gate for the RMII RCLK
 
+Optional subnodes:
+- mdio: See mdio.txt file in the same directory.
+
 Example:
 
 	mac0: ethernet@1e660000 {
@@ -40,3 +44,24 @@ Example:
 		interrupts = <2>;
 		use-ncsi;
 	};
+
+Example with phy-handle:
+
+	mac1: ethernet@1e680000 {
+		compatible = "aspeed,ast2500-mac", "faraday,ftgmac100";
+		reg = <0x1e680000 0x180>;
+		interrupts = <2>;
+
+		phy-handle = <&phy>;
+		phy-mode = "rgmii";
+
+		mdio {
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			phy: ethernet-phy@1 {
+				compatible = "ethernet-phy-ieee802.3-c22";
+				reg = <1>;
+			};
+		};
+	};

drivers/net/ethernet/faraday/ftgmac100.c

@@ -1044,10 +1044,39 @@ static void ftgmac100_adjust_link(struct net_device *netdev)
 	schedule_work(&priv->reset_task);
 }
 
-static int ftgmac100_mii_probe(struct ftgmac100 *priv, phy_interface_t intf)
+static int ftgmac100_mii_probe(struct net_device *netdev)
 {
-	struct net_device *netdev = priv->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 phy_device *phydev;
+	phy_interface_t phy_intf;
+	int err;
+
+	/* Default to RGMII. It's a gigabit part after all */
+	err = of_get_phy_mode(np, &phy_intf);
+	if (err)
+		phy_intf = PHY_INTERFACE_MODE_RGMII;
+
+	/* Aspeed only supports these. I don't know about other IP
+	 * block vendors so I'm going to just let them through for
+	 * now. Note that this is only a warning if for some obscure
+	 * reason the DT really means to lie about it or it's a newer
+	 * part we don't know about.
+	 *
+	 * On the Aspeed SoC there are additionally straps and SCU
+	 * control bits that could tell us what the interface is
+	 * (or allow us to configure it while the IP block is held
+	 * in reset). For now I chose to keep this driver away from
+	 * those SoC specific bits and assume the device-tree is
+	 * right and the SCU has been configured properly by pinmux
+	 * or the firmware.
+	 */
+	if (priv->is_aspeed && !(phy_interface_mode_is_rgmii(phy_intf))) {
+		netdev_warn(netdev,
+			    "Unsupported PHY mode %s !\n",
+			    phy_modes(phy_intf));
+	}
 
 	phydev = phy_find_first(priv->mii_bus);
 	if (!phydev) {
@@ -1056,7 +1085,7 @@ static int ftgmac100_mii_probe(struct ftgmac100 *priv, phy_interface_t intf)
 	}
 
 	phydev = phy_connect(netdev, phydev_name(phydev),
-			     &ftgmac100_adjust_link, intf);
+			     &ftgmac100_adjust_link, phy_intf);
 
 	if (IS_ERR(phydev)) {
 		netdev_err(netdev, "%s: Could not attach to PHY\n", netdev->name);
@@ -1601,8 +1630,8 @@ static int ftgmac100_setup_mdio(struct net_device *netdev)
 {
 	struct ftgmac100 *priv = netdev_priv(netdev);
 	struct platform_device *pdev = to_platform_device(priv->dev);
-	phy_interface_t phy_intf = PHY_INTERFACE_MODE_RGMII;
 	struct device_node *np = pdev->dev.of_node;
+	struct device_node *mdio_np;
 	int i, err = 0;
 	u32 reg;
 
@@ -1623,39 +1652,6 @@ static int ftgmac100_setup_mdio(struct net_device *netdev)
 		iowrite32(reg, priv->base + FTGMAC100_OFFSET_REVR);
 	}
 
-	/* Get PHY mode from device-tree */
-	if (np) {
-		/* Default to RGMII. It's a gigabit part after all */
-		err = of_get_phy_mode(np, &phy_intf);
-		if (err)
-			phy_intf = PHY_INTERFACE_MODE_RGMII;
-
-		/* Aspeed only supports these. I don't know about other IP
-		 * block vendors so I'm going to just let them through for
-		 * now. Note that this is only a warning if for some obscure
-		 * reason the DT really means to lie about it or it's a newer
-		 * part we don't know about.
-		 *
-		 * On the Aspeed SoC there are additionally straps and SCU
-		 * control bits that could tell us what the interface is
-		 * (or allow us to configure it while the IP block is held
-		 * in reset). For now I chose to keep this driver away from
-		 * those SoC specific bits and assume the device-tree is
-		 * right and the SCU has been configured properly by pinmux
-		 * or the firmware.
-		 */
-		if (priv->is_aspeed &&
-		    phy_intf != PHY_INTERFACE_MODE_RMII &&
-		    phy_intf != PHY_INTERFACE_MODE_RGMII &&
-		    phy_intf != PHY_INTERFACE_MODE_RGMII_ID &&
-		    phy_intf != PHY_INTERFACE_MODE_RGMII_RXID &&
-		    phy_intf != PHY_INTERFACE_MODE_RGMII_TXID) {
-			netdev_warn(netdev,
-				   "Unsupported PHY mode %s !\n",
-				   phy_modes(phy_intf));
-		}
-	}
-
 	priv->mii_bus->name = "ftgmac100_mdio";
 	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%d",
 		 pdev->name, pdev->id);
@@ -1667,35 +1663,38 @@ 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");
+
+	err = of_mdiobus_register(priv->mii_bus, mdio_np);
 	if (err) {
 		dev_err(priv->dev, "Cannot register MDIO bus!\n");
 		goto err_register_mdiobus;
 	}
 
-	err = ftgmac100_mii_probe(priv, phy_intf);
+	of_node_put(mdio_np);
-	if (err) {
-		dev_err(priv->dev, "MII Probe failed!\n");
-		goto err_mii_probe;
-	}
 
 	return 0;
 
-err_mii_probe:
-	mdiobus_unregister(priv->mii_bus);
 err_register_mdiobus:
 	mdiobus_free(priv->mii_bus);
 	return err;
 }
 
+static void ftgmac100_phy_disconnect(struct net_device *netdev)
+{
+	if (!netdev->phydev)
+		return;
+
+	phy_disconnect(netdev->phydev);
+}
+
 static void ftgmac100_destroy_mdio(struct net_device *netdev)
 {
 	struct ftgmac100 *priv = netdev_priv(netdev);
 
-	if (!netdev->phydev)
+	if (!priv->mii_bus)
 		return;
 
-	phy_disconnect(netdev->phydev);
 	mdiobus_unregister(priv->mii_bus);
 	mdiobus_free(priv->mii_bus);
 }
@@ -1830,22 +1829,33 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	if (np && of_get_property(np, "use-ncsi", NULL)) {
 		if (!IS_ENABLED(CONFIG_NET_NCSI)) {
 			dev_err(&pdev->dev, "NCSI stack not enabled\n");
-			goto err_ncsi_dev;
+			goto err_phy_connect;
 		}
 
 		dev_info(&pdev->dev, "Using NCSI interface\n");
 		priv->use_ncsi = true;
 		priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
 		if (!priv->ndev)
-			goto err_ncsi_dev;
+			goto err_phy_connect;
 	} 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");
-			goto err_setup_mdio;
+			goto err_phy_connect;
 		}
 
 		/* Indicate that we support PAUSE frames (see comment in
@@ -1865,12 +1875,19 @@ static int ftgmac100_probe(struct platform_device *pdev)
 		err = ftgmac100_setup_mdio(netdev);
 		if (err)
 			goto err_setup_mdio;
+
+		err = ftgmac100_mii_probe(netdev);
+		if (err) {
+			dev_err(priv->dev, "MII probe failed!\n");
+			goto err_ncsi_dev;
+		}
+
 	}
 
 	if (priv->is_aspeed) {
 		err = ftgmac100_setup_clk(priv);
 		if (err)
-			goto err_ncsi_dev;
+			goto err_phy_connect;
 	}
 
 	/* Default ring sizes */
@@ -1906,6 +1923,8 @@ static int ftgmac100_probe(struct platform_device *pdev)
 err_register_netdev:
 	clk_disable_unprepare(priv->rclk);
 	clk_disable_unprepare(priv->clk);
+err_phy_connect:
+	ftgmac100_phy_disconnect(netdev);
 err_ncsi_dev:
 	ftgmac100_destroy_mdio(netdev);
 err_setup_mdio:
@@ -1936,6 +1955,7 @@ static int ftgmac100_remove(struct platform_device *pdev)
 	 */
 	cancel_work_sync(&priv->reset_task);
 
+	ftgmac100_phy_disconnect(netdev);
 	ftgmac100_destroy_mdio(netdev);
 
 	iounmap(priv->base);