Merge branch 'mv88e6xxx-external-MDIO'

Andrew Lunn says:

====================
External MDIO support for mv88e6xxx

The mv88e6390 family of switches has two MDIO busses, one internal to
the switch and a second one for external usage. Older generations of switches
have a single MDIO bus, which is used both internally and externally.

Refactor the existing MDIO driver code to allow for multiple MDIO
busses, and implement the second MDIO bus on mv88e6390.

This is a rewrite of a patch previously submitted as part of "Batch
3". It has been broken up into 5 smaller patches. A compatible string
is now used in the device tree to indicate the external MDIO bus.
====================

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

5 files changed, 206 insertions, 59 deletions

diff --git a/Documentation/devicetree/bindings/net/dsa/marvell.txt b/Documentation/devicetree/bindings/net/dsa/marvell.txt
index b3dd6b40e0de..64dbdd825981 100644
--- a/Documentation/devicetree/bindings/net/dsa/marvell.txt
+++ b/Documentation/devicetree/bindings/net/dsa/marvell.txt
@@ -26,8 +26,12 @@ Optional properties:
 - interrupt-controller	: Indicates the switch is itself an interrupt
 			  controller. This is used for the PHY interrupts.
 #interrupt-cells = <2>	: Controller uses two cells, number and flag
-- mdio			: container of PHY and devices on the switches MDIO
-			  bus
+- mdio			: Container of PHY and devices on the switches MDIO
+			  bus.
+- mdio?			: Container of PHYs and devices on the external MDIO
+			  bus. The node must contains a compatible string of
+			  "marvell,mv88e6xxx-mdio-external"
+
 Example:
 
        mdio {
@@ -53,3 +57,36 @@ Example:
                        };
                };
        };
+
+       mdio {
+               #address-cells = <1>;
+               #size-cells = <0>;
+               interrupt-parent = <&gpio0>;
+               interrupts = <27 IRQ_TYPE_LEVEL_LOW>;
+               interrupt-controller;
+               #interrupt-cells = <2>;
+
+               switch0: switch@0 {
+                       compatible = "marvell,mv88e6390";
+                       reg = <0>;
+		       reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;
+               };
+               mdio {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       switch1phy0: switch1phy0@0 {
+                               reg = <0>;
+                               interrupt-parent = <&switch0>;
+                               interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+                       };
+               };
+
+               mdio1 {
+                       compatible = "marvell,mv88e6xxx-mdio-external";
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       switch1phy9: switch1phy0@9 {
+                               reg = <9>;
+                       };
+               };
+       };
diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index c7e08e13bb54..5668e778ed1d 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -222,26 +222,62 @@ int mv88e6xxx_write(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val)
 	return 0;
 }
 
+static int mv88e6165_phy_read(struct mv88e6xxx_chip *chip,
+			      struct mii_bus *bus,
+			      int addr, int reg, u16 *val)
+{
+	return mv88e6xxx_read(chip, addr, reg, val);
+}
+
+static int mv88e6165_phy_write(struct mv88e6xxx_chip *chip,
+			       struct mii_bus *bus,
+			       int addr, int reg, u16 val)
+{
+	return mv88e6xxx_write(chip, addr, reg, val);
+}
+
+static struct mii_bus *mv88e6xxx_default_mdio_bus(struct mv88e6xxx_chip *chip)
+{
+	struct mv88e6xxx_mdio_bus *mdio_bus;
+
+	mdio_bus = list_first_entry(&chip->mdios, struct mv88e6xxx_mdio_bus,
+				    list);
+	if (!mdio_bus)
+		return NULL;
+
+	return mdio_bus->bus;
+}
+
 static int mv88e6xxx_phy_read(struct mv88e6xxx_chip *chip, int phy,
 			      int reg, u16 *val)
 {
 	int addr = phy; /* PHY devices addresses start at 0x0 */
+	struct mii_bus *bus;
+
+	bus = mv88e6xxx_default_mdio_bus(chip);
+	if (!bus)
+		return -EOPNOTSUPP;
 
 	if (!chip->info->ops->phy_read)
 		return -EOPNOTSUPP;
 
-	return chip->info->ops->phy_read(chip, addr, reg, val);
+	return chip->info->ops->phy_read(chip, bus, addr, reg, val);
 }
 
 static int mv88e6xxx_phy_write(struct mv88e6xxx_chip *chip, int phy,
 			       int reg, u16 val)
 {
 	int addr = phy; /* PHY devices addresses start at 0x0 */
+	struct mii_bus *bus;
+
+	bus = mv88e6xxx_default_mdio_bus(chip);
+	if (!bus)
+		return -EOPNOTSUPP;
 
 	if (!chip->info->ops->phy_write)
 		return -EOPNOTSUPP;
 
-	return chip->info->ops->phy_write(chip, addr, reg, val);
+	return chip->info->ops->phy_write(chip, bus, addr, reg, val);
 }
 
 static int mv88e6xxx_phy_page_get(struct mv88e6xxx_chip *chip, int phy, u8 page)
@@ -611,8 +647,9 @@ static void mv88e6xxx_ppu_state_destroy(struct mv88e6xxx_chip *chip)
 	del_timer_sync(&chip->ppu_timer);
 }
 
-static int mv88e6xxx_phy_ppu_read(struct mv88e6xxx_chip *chip, int addr,
-				  int reg, u16 *val)
+static int mv88e6xxx_phy_ppu_read(struct mv88e6xxx_chip *chip,
+				  struct mii_bus *bus,
+				  int addr, int reg, u16 *val)
 {
 	int err;
 
@@ -625,8 +662,9 @@ static int mv88e6xxx_phy_ppu_read(struct mv88e6xxx_chip *chip, int addr,
 	return err;
 }
 
-static int mv88e6xxx_phy_ppu_write(struct mv88e6xxx_chip *chip, int addr,
-				   int reg, u16 val)
+static int mv88e6xxx_phy_ppu_write(struct mv88e6xxx_chip *chip,
+				   struct mii_bus *bus,
+				   int addr, int reg, u16 val)
 {
 	int err;
 
@@ -2821,7 +2859,7 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 	int i;
 
 	chip->ds = ds;
-	ds->slave_mii_bus = chip->mdio_bus;
+	ds->slave_mii_bus = mv88e6xxx_default_mdio_bus(chip);
 
 	mutex_lock(&chip->reg_lock);
 
@@ -2878,15 +2916,19 @@ static int mv88e6xxx_set_addr(struct dsa_switch *ds, u8 *addr)
 
 static int mv88e6xxx_mdio_read(struct mii_bus *bus, int phy, int reg)
 {
-	struct mv88e6xxx_chip *chip = bus->priv;
+	struct mv88e6xxx_mdio_bus *mdio_bus = bus->priv;
+	struct mv88e6xxx_chip *chip = mdio_bus->chip;
 	u16 val;
 	int err;
 
 	if (phy >= mv88e6xxx_num_ports(chip))
 		return 0xffff;
 
+	if (!chip->info->ops->phy_read)
+		return -EOPNOTSUPP;
+
 	mutex_lock(&chip->reg_lock);
-	err = mv88e6xxx_phy_read(chip, phy, reg, &val);
+	err = chip->info->ops->phy_read(chip, bus, phy, reg, &val);
 	mutex_unlock(&chip->reg_lock);
 
 	return err ? err : val;
@@ -2894,34 +2936,42 @@ static int mv88e6xxx_mdio_read(struct mii_bus *bus, int phy, int reg)
 
 static int mv88e6xxx_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
 {
-	struct mv88e6xxx_chip *chip = bus->priv;
+	struct mv88e6xxx_mdio_bus *mdio_bus = bus->priv;
+	struct mv88e6xxx_chip *chip = mdio_bus->chip;
 	int err;
 
 	if (phy >= mv88e6xxx_num_ports(chip))
 		return 0xffff;
 
+	if (!chip->info->ops->phy_write)
+		return -EOPNOTSUPP;
+
 	mutex_lock(&chip->reg_lock);
-	err = mv88e6xxx_phy_write(chip, phy, reg, val);
+	err = chip->info->ops->phy_write(chip, bus, phy, reg, val);
 	mutex_unlock(&chip->reg_lock);
 
 	return err;
 }
 
 static int mv88e6xxx_mdio_register(struct mv88e6xxx_chip *chip,
-				   struct device_node *np)
+				   struct device_node *np,
+				   bool external)
 {
 	static int index;
+	struct mv88e6xxx_mdio_bus *mdio_bus;
 	struct mii_bus *bus;
 	int err;
 
-	if (np)
-		chip->mdio_np = of_get_child_by_name(np, "mdio");
-
-	bus = devm_mdiobus_alloc(chip->dev);
+	bus = devm_mdiobus_alloc_size(chip->dev, sizeof(*mdio_bus));
 	if (!bus)
 		return -ENOMEM;
 
-	bus->priv = (void *)chip;
+	mdio_bus = bus->priv;
+	mdio_bus->bus = bus;
+	mdio_bus->chip = chip;
+	INIT_LIST_HEAD(&mdio_bus->list);
+	mdio_bus->external = external;
+
 	if (np) {
 		bus->name = np->full_name;
 		snprintf(bus->id, MII_BUS_ID_SIZE, "%s", np->full_name);
@@ -2934,34 +2984,72 @@ static int mv88e6xxx_mdio_register(struct mv88e6xxx_chip *chip,
 	bus->write = mv88e6xxx_mdio_write;
 	bus->parent = chip->dev;
 
-	if (chip->mdio_np)
-		err = of_mdiobus_register(bus, chip->mdio_np);
+	if (np)
+		err = of_mdiobus_register(bus, np);
 	else
 		err = mdiobus_register(bus);
 	if (err) {
 		dev_err(chip->dev, "Cannot register MDIO bus (%d)\n", err);
-		goto out;
+		return err;
 	}
-	chip->mdio_bus = bus;
+
+	if (external)
+		list_add_tail(&mdio_bus->list, &chip->mdios);
+	else
+		list_add(&mdio_bus->list, &chip->mdios);
 
 	return 0;
+}
 
-out:
-	if (chip->mdio_np)
-		of_node_put(chip->mdio_np);
+static const struct of_device_id mv88e6xxx_mdio_external_match[] = {
+	{ .compatible = "marvell,mv88e6xxx-mdio-external",
+	  .data = (void *)true },
+	{ },
+};
 
-	return err;
+static int mv88e6xxx_mdios_register(struct mv88e6xxx_chip *chip,
+				    struct device_node *np)
+{
+	const struct of_device_id *match;
+	struct device_node *child;
+	int err;
+
+	/* Always register one mdio bus for the internal/default mdio
+	 * bus. This maybe represented in the device tree, but is
+	 * optional.
+	 */
+	child = of_get_child_by_name(np, "mdio");
+	err = mv88e6xxx_mdio_register(chip, child, false);
+	if (err)
+		return err;
+
+	/* Walk the device tree, and see if there are any other nodes
+	 * which say they are compatible with the external mdio
+	 * bus.
+	 */
+	for_each_available_child_of_node(np, child) {
+		match = of_match_node(mv88e6xxx_mdio_external_match, child);
+		if (match) {
+			err = mv88e6xxx_mdio_register(chip, child, true);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
 }
 
-static void mv88e6xxx_mdio_unregister(struct mv88e6xxx_chip *chip)
+static void mv88e6xxx_mdios_unregister(struct mv88e6xxx_chip *chip)
 
 {
-	struct mii_bus *bus = chip->mdio_bus;
+	struct mv88e6xxx_mdio_bus *mdio_bus;
+	struct mii_bus *bus;
 
-	mdiobus_unregister(bus);
+	list_for_each_entry(mdio_bus, &chip->mdios, list) {
+		bus = mdio_bus->bus;
 
-	if (chip->mdio_np)
-		of_node_put(chip->mdio_np);
+		mdiobus_unregister(bus);
+	}
 }
 
 static int mv88e6xxx_get_eeprom_len(struct dsa_switch *ds)
@@ -3085,8 +3173,8 @@ static const struct mv88e6xxx_ops mv88e6097_ops = {
 static const struct mv88e6xxx_ops mv88e6123_ops = {
 	/* MV88E6XXX_FAMILY_6165 */
 	.set_switch_mac = mv88e6xxx_g2_set_switch_mac,
-	.phy_read = mv88e6xxx_read,
-	.phy_write = mv88e6xxx_write,
+	.phy_read = mv88e6165_phy_read,
+	.phy_write = mv88e6165_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_speed = mv88e6185_port_set_speed,
@@ -3132,8 +3220,8 @@ static const struct mv88e6xxx_ops mv88e6131_ops = {
 static const struct mv88e6xxx_ops mv88e6161_ops = {
 	/* MV88E6XXX_FAMILY_6165 */
 	.set_switch_mac = mv88e6xxx_g2_set_switch_mac,
-	.phy_read = mv88e6xxx_read,
-	.phy_write = mv88e6xxx_write,
+	.phy_read = mv88e6165_phy_read,
+	.phy_write = mv88e6165_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_speed = mv88e6185_port_set_speed,
@@ -3157,8 +3245,8 @@ static const struct mv88e6xxx_ops mv88e6161_ops = {
 static const struct mv88e6xxx_ops mv88e6165_ops = {
 	/* MV88E6XXX_FAMILY_6165 */
 	.set_switch_mac = mv88e6xxx_g2_set_switch_mac,
-	.phy_read = mv88e6xxx_read,
-	.phy_write = mv88e6xxx_write,
+	.phy_read = mv88e6165_phy_read,
+	.phy_write = mv88e6165_phy_write,
 	.port_set_link = mv88e6xxx_port_set_link,
 	.port_set_duplex = mv88e6xxx_port_set_duplex,
 	.port_set_speed = mv88e6185_port_set_speed,
@@ -4088,6 +4176,7 @@ static struct mv88e6xxx_chip *mv88e6xxx_alloc_chip(struct device *dev)
 	chip->dev = dev;
 
 	mutex_init(&chip->reg_lock);
+	INIT_LIST_HEAD(&chip->mdios);
 
 	return chip;
 }
@@ -4162,7 +4251,7 @@ static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
 
 	mv88e6xxx_phy_init(chip);
 
-	err = mv88e6xxx_mdio_register(chip, NULL);
+	err = mv88e6xxx_mdios_register(chip, NULL);
 	if (err)
 		goto free;
 
@@ -4363,7 +4452,7 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 		}
 	}
 
-	err = mv88e6xxx_mdio_register(chip, np);
+	err = mv88e6xxx_mdios_register(chip, np);
 	if (err)
 		goto out_g2_irq;
 
@@ -4374,7 +4463,7 @@ static int mv88e6xxx_probe(struct mdio_device *mdiodev)
 	return 0;
 
 out_mdio:
-	mv88e6xxx_mdio_unregister(chip);
+	mv88e6xxx_mdios_unregister(chip);
 out_g2_irq:
 	if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_G2_INT) && chip->irq > 0)
 		mv88e6xxx_g2_irq_free(chip);
@@ -4395,7 +4484,7 @@ static void mv88e6xxx_remove(struct mdio_device *mdiodev)
 
 	mv88e6xxx_phy_destroy(chip);
 	mv88e6xxx_unregister_switch(chip);
-	mv88e6xxx_mdio_unregister(chip);
+	mv88e6xxx_mdios_unregister(chip);
 
 	if (chip->irq > 0) {
 		if (mv88e6xxx_has(chip, MV88E6XXX_FLAG_G2_INT))
diff --git a/drivers/net/dsa/mv88e6xxx/global2.c b/drivers/net/dsa/mv88e6xxx/global2.c
index ead2e265c9ef..353e26bea3c3 100644
--- a/drivers/net/dsa/mv88e6xxx/global2.c
+++ b/drivers/net/dsa/mv88e6xxx/global2.c
@@ -501,12 +501,17 @@ static int mv88e6xxx_g2_smi_phy_cmd(struct mv88e6xxx_chip *chip, u16 cmd)
 	return mv88e6xxx_g2_smi_phy_wait(chip);
 }
 
-int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip, int addr, int reg,
-			      u16 *val)
+int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip,
+			      struct mii_bus *bus,
+			      int addr, int reg, u16 *val)
 {
 	u16 cmd = GLOBAL2_SMI_PHY_CMD_OP_22_READ_DATA | (addr << 5) | reg;
+	struct mv88e6xxx_mdio_bus *mdio_bus = bus->priv;
 	int err;
 
+	if (mdio_bus->external)
+		cmd |= GLOBAL2_SMI_PHY_CMD_EXTERNAL;
+
 	err = mv88e6xxx_g2_smi_phy_wait(chip);
 	if (err)
 		return err;
@@ -518,12 +523,17 @@ int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip, int addr, int reg,
 	return mv88e6xxx_g2_read(chip, GLOBAL2_SMI_PHY_DATA, val);
 }
 
-int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip, int addr, int reg,
-			       u16 val)
+int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip,
+			       struct mii_bus *bus,
+			       int addr, int reg, u16 val)
 {
 	u16 cmd = GLOBAL2_SMI_PHY_CMD_OP_22_WRITE_DATA | (addr << 5) | reg;
+	struct mv88e6xxx_mdio_bus *mdio_bus = bus->priv;
 	int err;
 
+	if (mdio_bus->external)
+		cmd |= GLOBAL2_SMI_PHY_CMD_EXTERNAL;
+
 	err = mv88e6xxx_g2_smi_phy_wait(chip);
 	if (err)
 		return err;
diff --git a/drivers/net/dsa/mv88e6xxx/global2.h b/drivers/net/dsa/mv88e6xxx/global2.h
index 2918f22388f7..00e635279ba1 100644
--- a/drivers/net/dsa/mv88e6xxx/global2.h
+++ b/drivers/net/dsa/mv88e6xxx/global2.h
@@ -23,10 +23,12 @@ static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
 	return 0;
 }
 
-int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip, int addr, int reg,
-			      u16 *val);
-int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip, int addr, int reg,
-			       u16 val);
+int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip,
+			      struct mii_bus *bus,
+			      int addr, int reg, u16 *val);
+int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip,
+			       struct mii_bus *bus,
+			       int addr, int reg, u16 val);
 int mv88e6xxx_g2_set_switch_mac(struct mv88e6xxx_chip *chip, u8 *addr);
 
 int mv88e6xxx_g2_get_eeprom8(struct mv88e6xxx_chip *chip,
@@ -57,12 +59,14 @@ static inline int mv88e6xxx_g2_require(struct mv88e6xxx_chip *chip)
 }
 
 static inline int mv88e6xxx_g2_smi_phy_read(struct mv88e6xxx_chip *chip,
+					    struct mii_bus *bus,
 					    int addr, int reg, u16 *val)
 {
 	return -EOPNOTSUPP;
 }
 
 static inline int mv88e6xxx_g2_smi_phy_write(struct mv88e6xxx_chip *chip,
+					     struct mii_bus *bus,
 					     int addr, int reg, u16 val)
 {
 	return -EOPNOTSUPP;
diff --git a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
index ce8b43b14e96..572d585dc1e2 100644
--- a/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx/mv88e6xxx.h
@@ -387,6 +387,7 @@
 #define GLOBAL2_PTP_AVB_DATA	0x17
 #define GLOBAL2_SMI_PHY_CMD			0x18
 #define GLOBAL2_SMI_PHY_CMD_BUSY		BIT(15)
+#define GLOBAL2_SMI_PHY_CMD_EXTERNAL		BIT(13)
 #define GLOBAL2_SMI_PHY_CMD_MODE_22		BIT(12)
 #define GLOBAL2_SMI_PHY_CMD_OP_22_WRITE_DATA	((0x1 << 10) | \
 						 GLOBAL2_SMI_PHY_CMD_MODE_22 | \
@@ -730,11 +731,8 @@ struct mv88e6xxx_chip {
 	/* set to size of eeprom if supported by the switch */
 	int		eeprom_len;
 
-	/* Device node for the MDIO bus */
-	struct device_node *mdio_np;
-
-	/* And the MDIO bus itself */
-	struct mii_bus *mdio_bus;
+	/* List of mdio busses */
+	struct list_head mdios;
 
 	/* There can be two interrupt controllers, which are chained
 	 * off a GPIO as interrupt source
@@ -750,6 +748,13 @@ struct mv88e6xxx_bus_ops {
 	int (*write)(struct mv88e6xxx_chip *chip, int addr, int reg, u16 val);
 };
 
+struct mv88e6xxx_mdio_bus {
+	struct mii_bus *bus;
+	struct mv88e6xxx_chip *chip;
+	struct list_head list;
+	bool external;
+};
+
 struct mv88e6xxx_ops {
 	int (*get_eeprom)(struct mv88e6xxx_chip *chip,
 			  struct ethtool_eeprom *eeprom, u8 *data);
@@ -758,10 +763,12 @@ struct mv88e6xxx_ops {
 
 	int (*set_switch_mac)(struct mv88e6xxx_chip *chip, u8 *addr);
 
-	int (*phy_read)(struct mv88e6xxx_chip *chip, int addr, int reg,
-			u16 *val);
-	int (*phy_write)(struct mv88e6xxx_chip *chip, int addr, int reg,
-			 u16 val);
+	int (*phy_read)(struct mv88e6xxx_chip *chip,
+			struct mii_bus *bus,
+			int addr, int reg, u16 *val);
+	int (*phy_write)(struct mv88e6xxx_chip *chip,
+			 struct mii_bus *bus,
+			 int addr, int reg, u16 val);
 
 	/* PHY Polling Unit (PPU) operations */
 	int (*ppu_enable)(struct mv88e6xxx_chip *chip);