Merge branch 'more-dsa-probing'

Andrew Lunn says:

====================
More enabler patches for DSA probing

The complete set of patches for the reworked DSA probing is too big to
post as once. These subset contains some enablers which are easy to
review.

Eventually, the Marvell driver will instantiate its own internal MDIO
bus, rather than have the framework do it, thus allows devices on the
bus to be listed in the device tree. Initialize the main mutex as soon
as it is created, to avoid lifetime issues with the mdio bus.

A previous patch renamed all the DSA probe functions to make room for
a true device probe. However the recent merging of all the Marvell
switch drivers resulted in mv88e6xxx going back to the old probe
name. Rename it again, so we can have a driver probe function.

Add minimum support for the Marvell switch driver to probe as an MDIO
device, as well as an DSA driver. Later patches will then register
this device with the new DSA core framework.

Move the GPIO reset code out of the DSA code. Different drivers may
need different reset mechanisms, e.g. via a reset controller for
memory mapped devices. Don't clutter up the core with this. Let each
driver implement what it needs.

master_dev is no longer needed in the switch drivers, since they have
access to a device pointer from the probe function. Remove it.

Let the switch parse the eeprom length from its one device tree
node. This is required with the new binding when the central DSA
platform device no longer exists.
====================

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

3 files changed, 122 insertions, 29 deletions

diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 448deb59b9a4..10ddd5a5dfb6 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -949,8 +949,8 @@ static int bcm_sf2_sw_setup(struct dsa_switch *ds)
 	/* All the interesting properties are at the parent device_node
 	 * level
 	 */
-	dn = ds->pd->of_node->parent;
-	bcm_sf2_identify_ports(priv, ds->pd->of_node);
+	dn = ds->cd->of_node->parent;
+	bcm_sf2_identify_ports(priv, ds->cd->of_node);
 
 	priv->irq0 = irq_of_parse_and_map(dn, 0);
 	priv->irq1 = irq_of_parse_and_map(dn, 1);
diff --git a/drivers/net/dsa/mv88e6xxx.c b/drivers/net/dsa/mv88e6xxx.c
index 835126e90afd..a3f0e7ec4067 100644
--- a/drivers/net/dsa/mv88e6xxx.c
+++ b/drivers/net/dsa/mv88e6xxx.c
@@ -5,6 +5,8 @@
  * Copyright (c) 2015 CMC Electronics, Inc.
  *	Added support for VLAN Table Unit operations
  *
+ * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch>
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
@@ -17,6 +19,7 @@
 #include <linux/if_bridge.h>
 #include <linux/jiffies.h>
 #include <linux/list.h>
+#include <linux/mdio.h>
 #include <linux/module.h>
 #include <linux/netdevice.h>
 #include <linux/gpio/consumer.h>
@@ -866,6 +869,16 @@ error:
 	return ret;
 }
 
+static int mv88e6xxx_get_eeprom_len(struct dsa_switch *ds)
+{
+	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+
+	if (mv88e6xxx_has(ps, MV88E6XXX_FLAG_EEPROM))
+		return ps->eeprom_len;
+
+	return 0;
+}
+
 static int mv88e6xxx_get_eeprom(struct dsa_switch *ds,
 				struct ethtool_eeprom *eeprom, u8 *data)
 {
@@ -2579,7 +2592,7 @@ static int mv88e6xxx_switch_reset(struct mv88e6xxx_priv_state *ps)
 {
 	bool ppu_active = mv88e6xxx_has(ps, MV88E6XXX_FLAG_PPU_ACTIVE);
 	u16 is_reset = (ppu_active ? 0x8800 : 0xc800);
-	struct gpio_desc *gpiod = ps->ds->pd->reset;
+	struct gpio_desc *gpiod = ps->reset;
 	unsigned long timeout;
 	int ret;
 	int i;
@@ -3020,9 +3033,9 @@ static int mv88e6xxx_setup_global(struct mv88e6xxx_priv_state *ps)
 	for (i = 0; i < 32; i++) {
 		int nexthop = 0x1f;
 
-		if (ps->ds->pd->rtable &&
+		if (ps->ds->cd->rtable &&
 		    i != ps->ds->index && i < ps->ds->dst->pd->nr_chips)
-			nexthop = ps->ds->pd->rtable[i] & 0x1f;
+			nexthop = ps->ds->cd->rtable[i] & 0x1f;
 
 		err = _mv88e6xxx_reg_write(
 			ps, REG_GLOBAL2,
@@ -3132,8 +3145,6 @@ static int mv88e6xxx_setup(struct dsa_switch *ds)
 
 	ps->ds = ds;
 
-	mutex_init(&ps->smi_mutex);
-
 	INIT_WORK(&ps->bridge_work, mv88e6xxx_bridge_work);
 
 	if (mv88e6xxx_has(ps, MV88E6XXX_FLAG_EEPROM))
@@ -3545,9 +3556,9 @@ mv88e6xxx_lookup_info(unsigned int prod_num, const struct mv88e6xxx_info *table,
 	return NULL;
 }
 
-static const char *mv88e6xxx_probe(struct device *dsa_dev,
-				   struct device *host_dev, int sw_addr,
-				   void **priv)
+static const char *mv88e6xxx_drv_probe(struct device *dsa_dev,
+				       struct device *host_dev, int sw_addr,
+				       void **priv)
 {
 	const struct mv88e6xxx_info *info;
 	struct mv88e6xxx_priv_state *ps;
@@ -3580,6 +3591,7 @@ static const char *mv88e6xxx_probe(struct device *dsa_dev,
 	ps->bus = bus;
 	ps->sw_addr = sw_addr;
 	ps->info = info;
+	mutex_init(&ps->smi_mutex);
 
 	*priv = ps;
 
@@ -3591,7 +3603,7 @@ static const char *mv88e6xxx_probe(struct device *dsa_dev,
 
 struct dsa_switch_driver mv88e6xxx_switch_driver = {
 	.tag_protocol		= DSA_TAG_PROTO_EDSA,
-	.probe			= mv88e6xxx_probe,
+	.probe			= mv88e6xxx_drv_probe,
 	.setup			= mv88e6xxx_setup,
 	.set_addr		= mv88e6xxx_set_addr,
 	.phy_read		= mv88e6xxx_phy_read,
@@ -3608,6 +3620,7 @@ struct dsa_switch_driver mv88e6xxx_switch_driver = {
 	.set_temp_limit		= mv88e6xxx_set_temp_limit,
 	.get_temp_alarm		= mv88e6xxx_get_temp_alarm,
 #endif
+	.get_eeprom_len		= mv88e6xxx_get_eeprom_len,
 	.get_eeprom		= mv88e6xxx_get_eeprom,
 	.set_eeprom		= mv88e6xxx_set_eeprom,
 	.get_regs_len		= mv88e6xxx_get_regs_len,
@@ -3626,36 +3639,106 @@ struct dsa_switch_driver mv88e6xxx_switch_driver = {
 	.port_fdb_dump          = mv88e6xxx_port_fdb_dump,
 };
 
-static int __init mv88e6xxx_init(void)
+int mv88e6xxx_probe(struct mdio_device *mdiodev)
 {
-	register_switch_driver(&mv88e6xxx_switch_driver);
+	struct device *dev = &mdiodev->dev;
+	struct device_node *np = dev->of_node;
+	struct mv88e6xxx_priv_state *ps;
+	int id, prod_num, rev;
+	struct dsa_switch *ds;
+	u32 eeprom_len;
+	int err;
+
+	ds = devm_kzalloc(dev, sizeof(*ds) + sizeof(*ps), GFP_KERNEL);
+	if (!ds)
+		return -ENOMEM;
+
+	ps = (struct mv88e6xxx_priv_state *)(ds + 1);
+	ds->priv = ps;
+	ds->dev = dev;
+	ps->dev = dev;
+	ps->ds = ds;
+	ps->bus = mdiodev->bus;
+	ps->sw_addr = mdiodev->addr;
+	mutex_init(&ps->smi_mutex);
+
+	get_device(&ps->bus->dev);
+
+	ds->drv = &mv88e6xxx_switch_driver;
+
+	id = mv88e6xxx_reg_read(ps, REG_PORT(0), PORT_SWITCH_ID);
+	if (id < 0)
+		return id;
+
+	prod_num = (id & 0xfff0) >> 4;
+	rev = id & 0x000f;
+
+	ps->info = mv88e6xxx_lookup_info(prod_num, mv88e6xxx_table,
+					 ARRAY_SIZE(mv88e6xxx_table));
+	if (!ps->info)
+		return -ENODEV;
+
+	ps->reset = devm_gpiod_get(&mdiodev->dev, "reset", GPIOD_ASIS);
+	if (IS_ERR(ps->reset)) {
+		err = PTR_ERR(ps->reset);
+		if (err == -ENOENT) {
+			/* Optional, so not an error */
+			ps->reset = NULL;
+		} else {
+			return err;
+		}
+	}
+
+	if (mv88e6xxx_has(ps, MV88E6XXX_FLAG_EEPROM) &&
+	    !of_property_read_u32(np, "eeprom-length", &eeprom_len))
+		ps->eeprom_len = eeprom_len;
+
+	dev_set_drvdata(dev, ds);
+
+	dev_info(dev, "switch 0x%x probed: %s, revision %u\n",
+		 prod_num, ps->info->name, rev);
 
 	return 0;
 }
+
+static void mv88e6xxx_remove(struct mdio_device *mdiodev)
+{
+	struct dsa_switch *ds = dev_get_drvdata(&mdiodev->dev);
+	struct mv88e6xxx_priv_state *ps = ds_to_priv(ds);
+
+	put_device(&ps->bus->dev);
+}
+
+static const struct of_device_id mv88e6xxx_of_match[] = {
+	{ .compatible = "marvell,mv88e6085" },
+	{ /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, mv88e6xxx_of_match);
+
+static struct mdio_driver mv88e6xxx_driver = {
+	.probe	= mv88e6xxx_probe,
+	.remove = mv88e6xxx_remove,
+	.mdiodrv.driver = {
+		.name = "mv88e6085",
+		.of_match_table = mv88e6xxx_of_match,
+	},
+};
+
+static int __init mv88e6xxx_init(void)
+{
+	register_switch_driver(&mv88e6xxx_switch_driver);
+	return mdio_driver_register(&mv88e6xxx_driver);
+}
 module_init(mv88e6xxx_init);
 
 static void __exit mv88e6xxx_cleanup(void)
 {
+	mdio_driver_unregister(&mv88e6xxx_driver);
 	unregister_switch_driver(&mv88e6xxx_switch_driver);
 }
 module_exit(mv88e6xxx_cleanup);
 
-MODULE_ALIAS("platform:mv88e6085");
-MODULE_ALIAS("platform:mv88e6095");
-MODULE_ALIAS("platform:mv88e6095f");
-MODULE_ALIAS("platform:mv88e6123");
-MODULE_ALIAS("platform:mv88e6131");
-MODULE_ALIAS("platform:mv88e6161");
-MODULE_ALIAS("platform:mv88e6165");
-MODULE_ALIAS("platform:mv88e6171");
-MODULE_ALIAS("platform:mv88e6172");
-MODULE_ALIAS("platform:mv88e6175");
-MODULE_ALIAS("platform:mv88e6176");
-MODULE_ALIAS("platform:mv88e6320");
-MODULE_ALIAS("platform:mv88e6321");
-MODULE_ALIAS("platform:mv88e6350");
-MODULE_ALIAS("platform:mv88e6351");
-MODULE_ALIAS("platform:mv88e6352");
 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 MODULE_DESCRIPTION("Driver for Marvell 88E6XXX ethernet switch chips");
 MODULE_LICENSE("GPL");
diff --git a/drivers/net/dsa/mv88e6xxx.h b/drivers/net/dsa/mv88e6xxx.h
index 5f09a4ea3cc5..40e8721ecfb1 100644
--- a/drivers/net/dsa/mv88e6xxx.h
+++ b/drivers/net/dsa/mv88e6xxx.h
@@ -12,6 +12,7 @@
 #define __MV88E6XXX_H
 
 #include <linux/if_vlan.h>
+#include <linux/gpio/consumer.h>
 
 #ifndef UINT64_MAX
 #define UINT64_MAX		(u64)(~((u64)0))
@@ -595,6 +596,15 @@ struct mv88e6xxx_priv_state {
 	DECLARE_BITMAP(port_state_update_mask, DSA_MAX_PORTS);
 
 	struct work_struct bridge_work;
+
+	/* A switch may have a GPIO line tied to its reset pin. Parse
+	 * this from the device tree, and use it before performing
+	 * switch soft reset.
+	 */
+	struct gpio_desc *reset;
+
+	/* set to size of eeprom if supported by the switch */
+	int		eeprom_len;
 };
 
 enum stat_type {