Merge branch 'user_mii_bus-cleanup-part-one'

Vladimir Oltean says:

====================
ds->user_mii_bus cleanup (part 1)

There are some drivers which assign ds->user_mii_bus when they
don't really need its specific functionality, aka non-OF based
dsa_user_phy_connect(). There was some confusion regarding the
fact that yes, this is why ds->user_mii_bus really exists, so
I've started a cleanup series which aims to eliminate the usage
of ds->user_mii_bus from drivers when there is nothing to gain
from it.

Today's drivers are lantiq_gswip, qca8k and bcm_sf2. The work is
not done here, but a "part 2" may or may not come, depending on
other priorities.

All patches were only compile-tested.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/bcm_sf2.c

@@ -621,8 +621,6 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds)
 		goto err_of_node_put;
 	}
 
-	priv->master_mii_dn = dn;
-
 	priv->user_mii_bus = mdiobus_alloc();
 	if (!priv->user_mii_bus) {
 		err = -ENOMEM;
@@ -635,7 +633,6 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds)
 	priv->user_mii_bus->write = bcm_sf2_sw_mdio_write;
 	snprintf(priv->user_mii_bus->id, MII_BUS_ID_SIZE, "sf2-%d",
 		 index++);
-	priv->user_mii_bus->dev.of_node = dn;
 
 	/* Include the pseudo-PHY address to divert reads towards our
 	 * workaround. This is only required for 7445D0, since 7445E0
@@ -683,9 +680,11 @@ static int bcm_sf2_mdio_register(struct dsa_switch *ds)
 	}
 
 	err = mdiobus_register(priv->user_mii_bus);
-	if (err && dn)
+	if (err)
 		goto err_free_user_mii_bus;
 
+	of_node_put(dn);
+
 	return 0;
 
 err_free_user_mii_bus:

drivers/net/dsa/bcm_sf2.h

@@ -107,7 +107,6 @@ struct bcm_sf2_priv {
 
 	/* Master and slave MDIO bus controller */
 	unsigned int			indir_phy_mask;
-	struct device_node		*master_mii_dn;
 	struct mii_bus			*user_mii_bus;
 	struct mii_bus			*master_mii_bus;
 

drivers/net/dsa/lantiq_gswip.c

@@ -505,27 +505,34 @@ static int gswip_mdio_rd(struct mii_bus *bus, int addr, int reg)
 	return gswip_mdio_r(priv, GSWIP_MDIO_READ);
 }
 
-static int gswip_mdio(struct gswip_priv *priv, struct device_node *mdio_np)
+static int gswip_mdio(struct gswip_priv *priv)
 {
-	struct dsa_switch *ds = priv->ds;
-	int err;
+	struct device_node *mdio_np, *switch_np = priv->dev->of_node;
+	struct device *dev = priv->dev;
+	struct mii_bus *bus;
+	int err = 0;
 
-	ds->user_mii_bus = mdiobus_alloc();
-	if (!ds->user_mii_bus)
-		return -ENOMEM;
+	mdio_np = of_get_compatible_child(switch_np, "lantiq,xrx200-mdio");
+	if (!of_device_is_available(mdio_np))
+		goto out_put_node;
 
-	ds->user_mii_bus->priv = priv;
-	ds->user_mii_bus->read = gswip_mdio_rd;
-	ds->user_mii_bus->write = gswip_mdio_wr;
-	ds->user_mii_bus->name = "lantiq,xrx200-mdio";
-	snprintf(ds->user_mii_bus->id, MII_BUS_ID_SIZE, "%s-mii",
-		 dev_name(priv->dev));
-	ds->user_mii_bus->parent = priv->dev;
-	ds->user_mii_bus->phy_mask = ~ds->phys_mii_mask;
+	bus = devm_mdiobus_alloc(dev);
+	if (!bus) {
+		err = -ENOMEM;
+		goto out_put_node;
+	}
 
-	err = of_mdiobus_register(ds->user_mii_bus, mdio_np);
-	if (err)
-		mdiobus_free(ds->user_mii_bus);
+	bus->priv = priv;
+	bus->read = gswip_mdio_rd;
+	bus->write = gswip_mdio_wr;
+	bus->name = "lantiq,xrx200-mdio";
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(priv->dev));
+	bus->parent = priv->dev;
+
+	err = devm_of_mdiobus_register(dev, bus, mdio_np);
+
+out_put_node:
+	of_node_put(mdio_np);
 
 	return err;
 }
@@ -2094,9 +2101,9 @@ static int gswip_gphy_fw_list(struct gswip_priv *priv,
 
 static int gswip_probe(struct platform_device *pdev)
 {
-	struct gswip_priv *priv;
-	struct device_node *np, *mdio_np, *gphy_fw_np;
+	struct device_node *np, *gphy_fw_np;
 	struct device *dev = &pdev->dev;
+	struct gswip_priv *priv;
 	int err;
 	int i;
 	u32 version;
@@ -2163,19 +2170,16 @@ static int gswip_probe(struct platform_device *pdev)
 	}
 
 	/* bring up the mdio bus */
-	mdio_np = of_get_compatible_child(dev->of_node, "lantiq,xrx200-mdio");
-	if (mdio_np) {
-		err = gswip_mdio(priv, mdio_np);
-		if (err) {
-			dev_err(dev, "mdio probe failed\n");
-			goto put_mdio_node;
-		}
+	err = gswip_mdio(priv);
+	if (err) {
+		dev_err(dev, "mdio probe failed\n");
+		goto gphy_fw_remove;
 	}
 
 	err = dsa_register_switch(priv->ds);
 	if (err) {
 		dev_err(dev, "dsa switch register failed: %i\n", err);
-		goto mdio_bus;
+		goto gphy_fw_remove;
 	}
 	if (!dsa_is_cpu_port(priv->ds, priv->hw_info->cpu_port)) {
 		dev_err(dev, "wrong CPU port defined, HW only supports port: %i",
@@ -2194,13 +2198,7 @@ static int gswip_probe(struct platform_device *pdev)
 disable_switch:
 	gswip_mdio_mask(priv, GSWIP_MDIO_GLOB_ENABLE, 0, GSWIP_MDIO_GLOB);
 	dsa_unregister_switch(priv->ds);
-mdio_bus:
-	if (mdio_np) {
-		mdiobus_unregister(priv->ds->user_mii_bus);
-		mdiobus_free(priv->ds->user_mii_bus);
-	}
-put_mdio_node:
-	of_node_put(mdio_np);
+gphy_fw_remove:
 	for (i = 0; i < priv->num_gphy_fw; i++)
 		gswip_gphy_fw_remove(priv, &priv->gphy_fw[i]);
 	return err;
@@ -2219,12 +2217,6 @@ static void gswip_remove(struct platform_device *pdev)
 
 	dsa_unregister_switch(priv->ds);
 
-	if (priv->ds->user_mii_bus) {
-		mdiobus_unregister(priv->ds->user_mii_bus);
-		of_node_put(priv->ds->user_mii_bus->dev.of_node);
-		mdiobus_free(priv->ds->user_mii_bus);
-	}
-
 	for (i = 0; i < priv->num_gphy_fw; i++)
 		gswip_gphy_fw_remove(priv, &priv->gphy_fw[i]);
 }

drivers/net/dsa/qca/qca8k-8xxx.c

@@ -947,36 +947,49 @@ static int
 qca8k_mdio_register(struct qca8k_priv *priv)
 {
 	struct dsa_switch *ds = priv->ds;
+	struct device *dev = ds->dev;
 	struct device_node *mdio;
 	struct mii_bus *bus;
+	int err = 0;
 
-	bus = devm_mdiobus_alloc(ds->dev);
-	if (!bus)
-		return -ENOMEM;
+	mdio = of_get_child_by_name(dev->of_node, "mdio");
+	if (mdio && !of_device_is_available(mdio))
+		goto out;
 
+	bus = devm_mdiobus_alloc(dev);
+	if (!bus) {
+		err = -ENOMEM;
+		goto out_put_node;
+	}
+
+	priv->internal_mdio_bus = bus;
 	bus->priv = (void *)priv;
 	snprintf(bus->id, MII_BUS_ID_SIZE, "qca8k-%d.%d",
 		 ds->dst->index, ds->index);
-	bus->parent = ds->dev;
-	bus->phy_mask = ~ds->phys_mii_mask;
-	ds->user_mii_bus = bus;
+	bus->parent = dev;
 
-	/* Check if the devicetree declare the port:phy mapping */
-	mdio = of_get_child_by_name(priv->dev->of_node, "mdio");
-	if (of_device_is_available(mdio)) {
+	if (mdio) {
+		/* Check if the device tree declares the port:phy mapping */
 		bus->name = "qca8k user mii";
 		bus->read = qca8k_internal_mdio_read;
 		bus->write = qca8k_internal_mdio_write;
-		return devm_of_mdiobus_register(priv->dev, bus, mdio);
+	} else {
+		/* If a mapping can't be found, the legacy mapping is used,
+		 * using qca8k_port_to_phy()
+		 */
+		ds->user_mii_bus = bus;
+		bus->phy_mask = ~ds->phys_mii_mask;
+		bus->name = "qca8k-legacy user mii";
+		bus->read = qca8k_legacy_mdio_read;
+		bus->write = qca8k_legacy_mdio_write;
 	}
 
-	/* If a mapping can't be found the legacy mapping is used,
-	 * using the qca8k_port_to_phy function
-	 */
-	bus->name = "qca8k-legacy user mii";
-	bus->read = qca8k_legacy_mdio_read;
-	bus->write = qca8k_legacy_mdio_write;
-	return devm_mdiobus_register(priv->dev, bus);
+	err = devm_of_mdiobus_register(dev, bus, mdio);
+
+out_put_node:
+	of_node_put(mdio);
+out:
+	return err;
 }
 
 static int

drivers/net/dsa/qca/qca8k-leds.c

@@ -366,7 +366,6 @@ qca8k_parse_port_leds(struct qca8k_priv *priv, struct fwnode_handle *port, int p
 {
 	struct fwnode_handle *led = NULL, *leds = NULL;
 	struct led_init_data init_data = { };
-	struct dsa_switch *ds = priv->ds;
 	enum led_default_state state;
 	struct qca8k_led *port_led;
 	int led_num, led_index;
@@ -429,7 +428,8 @@ qca8k_parse_port_leds(struct qca8k_priv *priv, struct fwnode_handle *port, int p
 		init_data.default_label = ":port";
 		init_data.fwnode = led;
 		init_data.devname_mandatory = true;
-		init_data.devicename = kasprintf(GFP_KERNEL, "%s:0%d", ds->user_mii_bus->id,
+		init_data.devicename = kasprintf(GFP_KERNEL, "%s:0%d",
+						 priv->internal_mdio_bus->id,
 						 port_num);
 		if (!init_data.devicename)
 			return -ENOMEM;

drivers/net/dsa/qca/qca8k.h

@@ -454,6 +454,7 @@ struct qca8k_priv {
 	struct qca8k_ports_config ports_config;
 	struct regmap *regmap;
 	struct mii_bus *bus;
+	struct mii_bus *internal_mdio_bus;
 	struct dsa_switch *ds;
 	struct mutex reg_mutex;
 	struct device *dev;