Create PHY Lib for U-Boot

Extends the mii_dev structure to participate in a full-blown MDIO and
PHY driver scheme.  The mii_dev structure and miiphy calls are modified
in such a way to allow the original mii command and miiphy
infrastructure to work as before, but also to support a new set of APIs
which allow (among other things) sharing of PHY driver code and 10G support

The mii command will continue to support normal PHY management functions
(Clause 22 of 802.3), but will not be changed to support 10G
(Clause 45).

The basic design is similar to PHY Lib from Linux, but simplified for
U-Boot's network and driver infrastructure.

We now have MDIO drivers and PHY drivers

An MDIO driver provides:
read
write
reset

A PHY driver provides:
(optionally): probe
config - initial setup, starting of auto-negotiation
startup - waiting for AN, and reading link state
shutdown - any cleanup needed

The ethernet drivers interact with the PHY Lib using these functions:
phy_connect()
phy_config()
phy_startup()
phy_shutdown()

Each PHY driver can be configured separately, or all at once using
config_phylib_all_drivers.h (added in the patch which adds the drivers)

We also provide generic drivers for Clause 22 (10/100/1000), and
Clause 45 (10G) PHYs.

We also implement phy_reset(), and call it in phy_connect(). Because
phy_reset() is essentially the same as miiphy_reset, but:
a) must support 10G PHYs, and
b) should use the phylib primitives,

we implement miiphy_reset, using phy_reset(), but only when
CONFIG_PHYLIB is set. Otherwise, we just use the old version. In this
way, we save on compile size, even if we don't manage to save code size.

Pulled ethtool.h and mdio.h from:
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6
782d640afd15af7a1faf01cfe566ca4ac511319d
With many, many deletions so as to enable compilation under u-boot

Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Detlev Zundel <dzu@denx.de>

1 files changed, 724 insertions, 0 deletions

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
new file mode 100644
index 0000000..919011d
--- /dev/null
+++ b/drivers/net/phy/phy.c
@@ -0,0 +1,724 @@
+/*
+ * Generic PHY Management code
+ *
+ * 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 (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ *
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ * author Andy Fleming
+ *
+ * Based loosely off of Linux's PHY Lib
+ */
+
+#include <config.h>
+#include <common.h>
+#include <malloc.h>
+#include <net.h>
+#include <command.h>
+#include <miiphy.h>
+#include <phy.h>
+#include <errno.h>
+
+/* Generic PHY support and helper functions */
+
+/**
+ * genphy_config_advert - sanitize and advertise auto-negotation parameters
+ * @phydev: target phy_device struct
+ *
+ * Description: Writes MII_ADVERTISE with the appropriate values,
+ *   after sanitizing the values to make sure we only advertise
+ *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
+ *   hasn't changed, and > 0 if it has changed.
+ */
+int genphy_config_advert(struct phy_device *phydev)
+{
+	u32 advertise;
+	int oldadv, adv;
+	int err, changed = 0;
+
+	/* Only allow advertising what
+	 * this PHY supports */
+	phydev->advertising &= phydev->supported;
+	advertise = phydev->advertising;
+
+	/* Setup standard advertisement */
+	oldadv = adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
+
+	if (adv < 0)
+		return adv;
+
+	adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
+		 ADVERTISE_PAUSE_ASYM);
+	if (advertise & ADVERTISED_10baseT_Half)
+		adv |= ADVERTISE_10HALF;
+	if (advertise & ADVERTISED_10baseT_Full)
+		adv |= ADVERTISE_10FULL;
+	if (advertise & ADVERTISED_100baseT_Half)
+		adv |= ADVERTISE_100HALF;
+	if (advertise & ADVERTISED_100baseT_Full)
+		adv |= ADVERTISE_100FULL;
+	if (advertise & ADVERTISED_Pause)
+		adv |= ADVERTISE_PAUSE_CAP;
+	if (advertise & ADVERTISED_Asym_Pause)
+		adv |= ADVERTISE_PAUSE_ASYM;
+
+	if (adv != oldadv) {
+		err = phy_write(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE, adv);
+
+		if (err < 0)
+			return err;
+		changed = 1;
+	}
+
+	/* Configure gigabit if it's supported */
+	if (phydev->supported & (SUPPORTED_1000baseT_Half |
+				SUPPORTED_1000baseT_Full)) {
+		oldadv = adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
+
+		if (adv < 0)
+			return adv;
+
+		adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
+		if (advertise & SUPPORTED_1000baseT_Half)
+			adv |= ADVERTISE_1000HALF;
+		if (advertise & SUPPORTED_1000baseT_Full)
+			adv |= ADVERTISE_1000FULL;
+
+		if (adv != oldadv) {
+			err = phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000,
+					adv);
+
+			if (err < 0)
+				return err;
+			changed = 1;
+		}
+	}
+
+	return changed;
+}
+
+
+/**
+ * genphy_setup_forced - configures/forces speed/duplex from @phydev
+ * @phydev: target phy_device struct
+ *
+ * Description: Configures MII_BMCR to force speed/duplex
+ *   to the values in phydev. Assumes that the values are valid.
+ */
+int genphy_setup_forced(struct phy_device *phydev)
+{
+	int err;
+	int ctl = 0;
+
+	phydev->pause = phydev->asym_pause = 0;
+
+	if (SPEED_1000 == phydev->speed)
+		ctl |= BMCR_SPEED1000;
+	else if (SPEED_100 == phydev->speed)
+		ctl |= BMCR_SPEED100;
+
+	if (DUPLEX_FULL == phydev->duplex)
+		ctl |= BMCR_FULLDPLX;
+
+	err = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
+
+	return err;
+}
+
+
+/**
+ * genphy_restart_aneg - Enable and Restart Autonegotiation
+ * @phydev: target phy_device struct
+ */
+int genphy_restart_aneg(struct phy_device *phydev)
+{
+	int ctl;
+
+	ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
+
+	if (ctl < 0)
+		return ctl;
+
+	ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
+
+	/* Don't isolate the PHY if we're negotiating */
+	ctl &= ~(BMCR_ISOLATE);
+
+	ctl = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
+
+	return ctl;
+}
+
+
+/**
+ * genphy_config_aneg - restart auto-negotiation or write BMCR
+ * @phydev: target phy_device struct
+ *
+ * Description: If auto-negotiation is enabled, we configure the
+ *   advertising, and then restart auto-negotiation.  If it is not
+ *   enabled, then we write the BMCR.
+ */
+int genphy_config_aneg(struct phy_device *phydev)
+{
+	int result;
+
+	if (AUTONEG_ENABLE != phydev->autoneg)
+		return genphy_setup_forced(phydev);
+
+	result = genphy_config_advert(phydev);
+
+	if (result < 0) /* error */
+		return result;
+
+	if (result == 0) {
+		/* Advertisment hasn't changed, but maybe aneg was never on to
+		 * begin with?  Or maybe phy was isolated? */
+		int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
+
+		if (ctl < 0)
+			return ctl;
+
+		if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
+			result = 1; /* do restart aneg */
+	}
+
+	/* Only restart aneg if we are advertising something different
+	 * than we were before.	 */
+	if (result > 0)
+		result = genphy_restart_aneg(phydev);
+
+	return result;
+}
+
+/**
+ * genphy_update_link - update link status in @phydev
+ * @phydev: target phy_device struct
+ *
+ * Description: Update the value in phydev->link to reflect the
+ *   current link value.  In order to do this, we need to read
+ *   the status register twice, keeping the second value.
+ */
+int genphy_update_link(struct phy_device *phydev)
+{
+	unsigned int mii_reg;
+
+	/*
+	 * Wait if the link is up, and autonegotiation is in progress
+	 * (ie - we're capable and it's not done)
+	 */
+	mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
+
+	/*
+	 * If we already saw the link up, and it hasn't gone down, then
+	 * we don't need to wait for autoneg again
+	 */
+	if (phydev->link && mii_reg & BMSR_LSTATUS)
+		return 0;
+
+	if ((mii_reg & BMSR_ANEGCAPABLE) && !(mii_reg & BMSR_ANEGCOMPLETE)) {
+		int i = 0;
+
+		printf("%s Waiting for PHY auto negotiation to complete",
+			phydev->dev->name);
+		while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
+			/*
+			 * Timeout reached ?
+			 */
+			if (i > PHY_ANEG_TIMEOUT) {
+				printf(" TIMEOUT !\n");
+				phydev->link = 0;
+				return 0;
+			}
+
+			if (ctrlc()) {
+				puts("user interrupt!\n");
+				phydev->link = 0;
+				return -EINTR;
+			}
+
+			if ((i++ % 500) == 0)
+				printf(".");
+
+			udelay(1000);	/* 1 ms */
+			mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
+		}
+		printf(" done\n");
+		phydev->link = 1;
+	} else {
+		/* Read the link a second time to clear the latched state */
+		mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
+
+		if (mii_reg & BMSR_LSTATUS)
+			phydev->link = 1;
+		else
+			phydev->link = 0;
+	}
+
+	return 0;
+}
+
+/*
+ * Generic function which updates the speed and duplex.  If
+ * autonegotiation is enabled, it uses the AND of the link
+ * partner's advertised capabilities and our advertised
+ * capabilities.  If autonegotiation is disabled, we use the
+ * appropriate bits in the control register.
+ *
+ * Stolen from Linux's mii.c and phy_device.c
+ */
+static int genphy_parse_link(struct phy_device *phydev)
+{
+	int mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
+
+	/* We're using autonegotiation */
+	if (mii_reg & BMSR_ANEGCAPABLE) {
+		u32 lpa = 0;
+		u32 gblpa = 0;
+
+		/* Check for gigabit capability */
+		if (mii_reg & BMSR_ERCAP) {
+			/* We want a list of states supported by
+			 * both PHYs in the link
+			 */
+			gblpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_STAT1000);
+			gblpa &= phy_read(phydev,
+					MDIO_DEVAD_NONE, MII_CTRL1000) << 2;
+		}
+
+		/* Set the baseline so we only have to set them
+		 * if they're different
+		 */
+		phydev->speed = SPEED_10;
+		phydev->duplex = DUPLEX_HALF;
+
+		/* Check the gigabit fields */
+		if (gblpa & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
+			phydev->speed = SPEED_1000;
+
+			if (gblpa & PHY_1000BTSR_1000FD)
+				phydev->duplex = DUPLEX_FULL;
+
+			/* We're done! */
+			return 0;
+		}
+
+		lpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
+		lpa &= phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
+
+		if (lpa & (LPA_100FULL | LPA_100HALF)) {
+			phydev->speed = SPEED_100;
+
+			if (lpa & LPA_100FULL)
+				phydev->duplex = DUPLEX_FULL;
+
+		} else if (lpa & LPA_10FULL)
+			phydev->duplex = DUPLEX_FULL;
+	} else {
+		u32 bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
+
+		phydev->speed = SPEED_10;
+		phydev->duplex = DUPLEX_HALF;
+
+		if (bmcr & BMCR_FULLDPLX)
+			phydev->duplex = DUPLEX_FULL;
+
+		if (bmcr & BMCR_SPEED1000)
+			phydev->speed = SPEED_1000;
+		else if (bmcr & BMCR_SPEED100)
+			phydev->speed = SPEED_100;
+	}
+
+	return 0;
+}
+
+int genphy_config(struct phy_device *phydev)
+{
+	int val;
+	u32 features;
+
+	/* For now, I'll claim that the generic driver supports
+	 * all possible port types */
+	features = (SUPPORTED_TP | SUPPORTED_MII
+			| SUPPORTED_AUI | SUPPORTED_FIBRE |
+			SUPPORTED_BNC);
+
+	/* Do we support autonegotiation? */
+	val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
+
+	if (val < 0)
+		return val;
+
+	if (val & BMSR_ANEGCAPABLE)
+		features |= SUPPORTED_Autoneg;
+
+	if (val & BMSR_100FULL)
+		features |= SUPPORTED_100baseT_Full;
+	if (val & BMSR_100HALF)
+		features |= SUPPORTED_100baseT_Half;
+	if (val & BMSR_10FULL)
+		features |= SUPPORTED_10baseT_Full;
+	if (val & BMSR_10HALF)
+		features |= SUPPORTED_10baseT_Half;
+
+	if (val & BMSR_ESTATEN) {
+		val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);
+
+		if (val < 0)
+			return val;
+
+		if (val & ESTATUS_1000_TFULL)
+			features |= SUPPORTED_1000baseT_Full;
+		if (val & ESTATUS_1000_THALF)
+			features |= SUPPORTED_1000baseT_Half;
+	}
+
+	phydev->supported = features;
+	phydev->advertising = features;
+
+	genphy_config_aneg(phydev);
+
+	return 0;
+}
+
+int genphy_startup(struct phy_device *phydev)
+{
+	genphy_update_link(phydev);
+	genphy_parse_link(phydev);
+
+	return 0;
+}
+
+int genphy_shutdown(struct phy_device *phydev)
+{
+	return 0;
+}
+
+static struct phy_driver genphy_driver = {
+	.uid		= 0xffffffff,
+	.mask		= 0xffffffff,
+	.name		= "Generic PHY",
+	.features	= 0,
+	.config		= genphy_config,
+	.startup	= genphy_startup,
+	.shutdown	= genphy_shutdown,
+};
+
+static LIST_HEAD(phy_drivers);
+
+int phy_init(void)
+{
+	return 0;
+}
+
+int phy_register(struct phy_driver *drv)
+{
+	INIT_LIST_HEAD(&drv->list);
+	list_add_tail(&drv->list, &phy_drivers);
+
+	return 0;
+}
+
+int phy_probe(struct phy_device *phydev)
+{
+	int err = 0;
+
+	phydev->advertising = phydev->supported = phydev->drv->features;
+	phydev->mmds = phydev->drv->mmds;
+
+	if (phydev->drv->probe)
+		err = phydev->drv->probe(phydev);
+
+	return err;
+}
+
+static struct phy_driver *generic_for_interface(phy_interface_t interface)
+{
+#ifdef CONFIG_PHYLIB_10G
+	if (is_10g_interface(interface))
+		return &gen10g_driver;
+#endif
+
+	return &genphy_driver;
+}
+
+struct phy_driver *get_phy_driver(struct phy_device *phydev,
+				phy_interface_t interface)
+{
+	struct list_head *entry;
+	int phy_id = phydev->phy_id;
+	struct phy_driver *drv = NULL;
+
+	list_for_each(entry, &phy_drivers) {
+		drv = list_entry(entry, struct phy_driver, list);
+		if ((drv->uid & drv->mask) == (phy_id & drv->mask))
+			return drv;
+	}
+
+	/* If we made it here, there's no driver for this PHY */
+	return generic_for_interface(interface);
+}
+
+struct phy_device *phy_device_create(struct mii_dev *bus, int addr, int phy_id,
+					phy_interface_t interface)
+{
+	struct phy_device *dev;
+
+	/* We allocate the device, and initialize the
+	 * default values */
+	dev = malloc(sizeof(*dev));
+	if (!dev) {
+		printf("Failed to allocate PHY device for %s:%d\n",
+			bus->name, addr);
+		return NULL;
+	}
+
+	memset(dev, 0, sizeof(*dev));
+
+	dev->duplex = -1;
+	dev->link = 1;
+	dev->interface = interface;
+
+	dev->autoneg = AUTONEG_ENABLE;
+
+	dev->addr = addr;
+	dev->phy_id = phy_id;
+	dev->bus = bus;
+
+	dev->drv = get_phy_driver(dev, interface);
+
+	phy_probe(dev);
+
+	bus->phymap[addr] = dev;
+
+	return dev;
+}
+
+/**
+ * get_phy_id - reads the specified addr for its ID.
+ * @bus: the target MII bus
+ * @addr: PHY address on the MII bus
+ * @phy_id: where to store the ID retrieved.
+ *
+ * Description: Reads the ID registers of the PHY at @addr on the
+ *   @bus, stores it in @phy_id and returns zero on success.
+ */
+int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
+{
+	int phy_reg;
+
+	/* Grab the bits from PHYIR1, and put them
+	 * in the upper half */
+	phy_reg = bus->read(bus, addr, devad, MII_PHYSID1);
+
+	if (phy_reg < 0)
+		return -EIO;
+
+	*phy_id = (phy_reg & 0xffff) << 16;
+
+	/* Grab the bits from PHYIR2, and put them in the lower half */
+	phy_reg = bus->read(bus, addr, devad, MII_PHYSID2);
+
+	if (phy_reg < 0)
+		return -EIO;
+
+	*phy_id |= (phy_reg & 0xffff);
+
+	return 0;
+}
+
+/**
+ * get_phy_device - reads the specified PHY device and returns its @phy_device struct
+ * @bus: the target MII bus
+ * @addr: PHY address on the MII bus
+ *
+ * Description: Reads the ID registers of the PHY at @addr on the
+ *   @bus, then allocates and returns the phy_device to represent it.
+ */
+struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
+				phy_interface_t interface)
+{
+	u32 phy_id = 0x1fffffff;
+	int i;
+	int r;
+
+	/* If we have one, return the existing device, with new interface */
+	if (bus->phymap[addr]) {
+		bus->phymap[addr]->interface = interface;
+
+		return bus->phymap[addr];
+	}
+
+	/* Try Standard (ie Clause 22) access */
+	r = get_phy_id(bus, addr, MDIO_DEVAD_NONE, &phy_id);
+	if (r)
+		return NULL;
+
+	/* If the PHY ID is mostly f's, we didn't find anything */
+	if ((phy_id & 0x1fffffff) != 0x1fffffff)
+		return phy_device_create(bus, addr, phy_id, interface);
+
+	/* Otherwise we have to try Clause 45 */
+	for (i = 1; i < 5; i++) {
+		r = get_phy_id(bus, addr, i, &phy_id);
+		if (r)
+			return NULL;
+
+		/* If the phy_id is mostly Fs, there is no device there */
+		if ((phy_id & 0x1fffffff) != 0x1fffffff)
+			break;
+	}
+
+	return phy_device_create(bus, addr, phy_id, interface);
+}
+
+int phy_reset(struct phy_device *phydev)
+{
+	int reg;
+	int timeout = 500;
+	int devad = MDIO_DEVAD_NONE;
+
+#ifdef CONFIG_PHYLIB_10G
+	/* If it's 10G, we need to issue reset through one of the MMDs */
+	if (is_10g_interface(phydev->interface)) {
+		if (!phydev->mmds)
+			gen10g_discover_mmds(phydev);
+
+		devad = ffs(phydev->mmds) - 1;
+	}
+#endif
+
+	reg = phy_read(phydev, devad, MII_BMCR);
+	if (reg < 0) {
+		debug("PHY status read failed\n");
+		return -1;
+	}
+
+	reg |= BMCR_RESET;
+
+	if (phy_write(phydev, devad, MII_BMCR, reg) < 0) {
+		debug("PHY reset failed\n");
+		return -1;
+	}
+
+#ifdef CONFIG_PHY_RESET_DELAY
+	udelay(CONFIG_PHY_RESET_DELAY);	/* Intel LXT971A needs this */
+#endif
+	/*
+	 * Poll the control register for the reset bit to go to 0 (it is
+	 * auto-clearing).  This should happen within 0.5 seconds per the
+	 * IEEE spec.
+	 */
+	while ((reg & BMCR_RESET) && timeout--) {
+		reg = phy_read(phydev, devad, MII_BMCR);
+
+		if (reg < 0) {
+			debug("PHY status read failed\n");
+			return -1;
+		}
+		udelay(1000);
+	}
+
+	if (reg & BMCR_RESET) {
+		puts("PHY reset timed out\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+int miiphy_reset(const char *devname, unsigned char addr)
+{
+	struct mii_dev *bus = miiphy_get_dev_by_name(devname);
+	struct phy_device *phydev;
+
+	/*
+	 * miiphy_reset was only used on standard PHYs, so we'll fake it here.
+	 * If later code tries to connect with the right interface, this will
+	 * be corrected by get_phy_device in phy_connect()
+	 */
+	phydev = get_phy_device(bus, addr, PHY_INTERFACE_MODE_MII);
+
+	return phy_reset(phydev);
+}
+
+struct phy_device *phy_connect(struct mii_dev *bus, int addr,
+				struct eth_device *dev,
+				phy_interface_t interface)
+{
+	struct phy_device *phydev;
+
+	/* Reset the bus */
+	bus->reset(bus);
+
+	/* Wait 15ms to make sure the PHY has come out of hard reset */
+	udelay(15000);
+
+	phydev = get_phy_device(bus, addr, interface);
+
+	if (!phydev) {
+		printf("Could not get PHY for %s:%d\n", bus->name, addr);
+
+		return NULL;
+	}
+
+	/* Soft Reset the PHY */
+	phy_reset(phydev);
+
+	if (phydev->dev)
+		printf("%s:%d is connected to %s.  Reconnecting to %s\n",
+			bus->name, addr, phydev->dev->name, dev->name);
+
+	phydev->dev = dev;
+
+	printf("%s connected to %s\n", dev->name, phydev->drv->name);
+
+	return phydev;
+}
+
+int phy_startup(struct phy_device *phydev)
+{
+	if (phydev->drv->startup)
+		phydev->drv->startup(phydev);
+
+	return 0;
+}
+
+static int __board_phy_config(struct phy_device *phydev)
+{
+	return 0;
+}
+
+int board_phy_config(struct phy_device *phydev)
+	__attribute__((weak, alias("__board_phy_config")));
+
+int phy_config(struct phy_device *phydev)
+{
+	if (phydev->drv->config)
+		phydev->drv->config(phydev);
+
+	/* Invoke an optional board-specific helper */
+	board_phy_config(phydev);
+
+	return 0;
+}
+
+int phy_shutdown(struct phy_device *phydev)
+{
+	if (phydev->drv->shutdown)
+		phydev->drv->shutdown(phydev);
+
+	return 0;
+}