drivers/net/phy/phy.c

   1 /*
   2  * Generic PHY Management code
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of
   7  * the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  17  * MA 02111-1307 USA
  18  *
  19  *
  20  * Copyright 2011 Freescale Semiconductor, Inc.
  21  * author Andy Fleming
  22  *
  23  * Based loosely off of Linux's PHY Lib
  24  */
  25
  26 #include <config.h>
  27 #include <common.h>
  28 #include <malloc.h>
  29 #include <net.h>
  30 #include <command.h>
  31 #include <miiphy.h>
  32 #include <phy.h>
  33 #include <errno.h>
  34
  35 /* Generic PHY support and helper functions */
  36
  37 /**
  38  * genphy_config_advert - sanitize and advertise auto-negotation parameters
  39  * @phydev: target phy_device struct
  40  *
  41  * Description: Writes MII_ADVERTISE with the appropriate values,
  42  *   after sanitizing the values to make sure we only advertise
  43  *   what is supported.  Returns < 0 on error, 0 if the PHY's advertisement
  44  *   hasn't changed, and > 0 if it has changed.
  45  */
  46 int genphy_config_advert(struct phy_device *phydev)
  47 {
  48         u32 advertise;
  49         int oldadv, adv;
  50         int err, changed = 0;
  51
  52         /* Only allow advertising what
  53          * this PHY supports */
  54         phydev->advertising &= phydev->supported;
  55         advertise = phydev->advertising;
  56
  57         /* Setup standard advertisement */
  58         oldadv = adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
  59
  60         if (adv < 0)
  61                 return adv;
  62
  63         adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
  64                  ADVERTISE_PAUSE_ASYM);
  65         if (advertise & ADVERTISED_10baseT_Half)
  66                 adv |= ADVERTISE_10HALF;
  67         if (advertise & ADVERTISED_10baseT_Full)
  68                 adv |= ADVERTISE_10FULL;
  69         if (advertise & ADVERTISED_100baseT_Half)
  70                 adv |= ADVERTISE_100HALF;
  71         if (advertise & ADVERTISED_100baseT_Full)
  72                 adv |= ADVERTISE_100FULL;
  73         if (advertise & ADVERTISED_Pause)
  74                 adv |= ADVERTISE_PAUSE_CAP;
  75         if (advertise & ADVERTISED_Asym_Pause)
  76                 adv |= ADVERTISE_PAUSE_ASYM;
  77
  78         if (adv != oldadv) {
  79                 err = phy_write(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE, adv);
  80
  81                 if (err < 0)
  82                         return err;
  83                 changed = 1;
  84         }
  85
  86         /* Configure gigabit if it's supported */
  87         if (phydev->supported & (SUPPORTED_1000baseT_Half |
  88                                 SUPPORTED_1000baseT_Full)) {
  89                 oldadv = adv = phy_read(phydev, MDIO_DEVAD_NONE, MII_CTRL1000);
  90
  91                 if (adv < 0)
  92                         return adv;
  93
  94                 adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
  95                 if (advertise & SUPPORTED_1000baseT_Half)
  96                         adv |= ADVERTISE_1000HALF;
  97                 if (advertise & SUPPORTED_1000baseT_Full)
  98                         adv |= ADVERTISE_1000FULL;
  99
 100                 if (adv != oldadv) {
 101                         err = phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000,
 102                                         adv);
 103
 104                         if (err < 0)
 105                                 return err;
 106                         changed = 1;
 107                 }
 108         }
 109
 110         return changed;
 111 }
 112
 113
 114 /**
 115  * genphy_setup_forced - configures/forces speed/duplex from @phydev
 116  * @phydev: target phy_device struct
 117  *
 118  * Description: Configures MII_BMCR to force speed/duplex
 119  *   to the values in phydev. Assumes that the values are valid.
 120  */
 121 int genphy_setup_forced(struct phy_device *phydev)
 122 {
 123         int err;
 124         int ctl = 0;
 125
 126         phydev->pause = phydev->asym_pause = 0;
 127
 128         if (SPEED_1000 == phydev->speed)
 129                 ctl |= BMCR_SPEED1000;
 130         else if (SPEED_100 == phydev->speed)
 131                 ctl |= BMCR_SPEED100;
 132
 133         if (DUPLEX_FULL == phydev->duplex)
 134                 ctl |= BMCR_FULLDPLX;
 135
 136         err = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
 137
 138         return err;
 139 }
 140
 141
 142 /**
 143  * genphy_restart_aneg - Enable and Restart Autonegotiation
 144  * @phydev: target phy_device struct
 145  */
 146 int genphy_restart_aneg(struct phy_device *phydev)
 147 {
 148         int ctl;
 149
 150         ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 151
 152         if (ctl < 0)
 153                 return ctl;
 154
 155         ctl |= (BMCR_ANENABLE | BMCR_ANRESTART);
 156
 157         /* Don't isolate the PHY if we're negotiating */
 158         ctl &= ~(BMCR_ISOLATE);
 159
 160         ctl = phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, ctl);
 161
 162         return ctl;
 163 }
 164
 165
 166 /**
 167  * genphy_config_aneg - restart auto-negotiation or write BMCR
 168  * @phydev: target phy_device struct
 169  *
 170  * Description: If auto-negotiation is enabled, we configure the
 171  *   advertising, and then restart auto-negotiation.  If it is not
 172  *   enabled, then we write the BMCR.
 173  */
 174 int genphy_config_aneg(struct phy_device *phydev)
 175 {
 176         int result;
 177
 178         if (AUTONEG_ENABLE != phydev->autoneg)
 179                 return genphy_setup_forced(phydev);
 180
 181         result = genphy_config_advert(phydev);
 182
 183         if (result < 0) /* error */
 184                 return result;
 185
 186         if (result == 0) {
 187                 /* Advertisment hasn't changed, but maybe aneg was never on to
 188                  * begin with?  Or maybe phy was isolated? */
 189                 int ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 190
 191                 if (ctl < 0)
 192                         return ctl;
 193
 194                 if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
 195                         result = 1; /* do restart aneg */
 196         }
 197
 198         /* Only restart aneg if we are advertising something different
 199          * than we were before.  */
 200         if (result > 0)
 201                 result = genphy_restart_aneg(phydev);
 202
 203         return result;
 204 }
 205
 206 /**
 207  * genphy_update_link - update link status in @phydev
 208  * @phydev: target phy_device struct
 209  *
 210  * Description: Update the value in phydev->link to reflect the
 211  *   current link value.  In order to do this, we need to read
 212  *   the status register twice, keeping the second value.
 213  */
 214 int genphy_update_link(struct phy_device *phydev)
 215 {
 216         unsigned int mii_reg;
 217
 218         /*
 219          * Wait if the link is up, and autonegotiation is in progress
 220          * (ie - we're capable and it's not done)
 221          */
 222         mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 223
 224         /*
 225          * If we already saw the link up, and it hasn't gone down, then
 226          * we don't need to wait for autoneg again
 227          */
 228         if (phydev->link && mii_reg & BMSR_LSTATUS)
 229                 return 0;
 230
 231         if ((mii_reg & BMSR_ANEGCAPABLE) && !(mii_reg & BMSR_ANEGCOMPLETE)) {
 232                 int i = 0;
 233
 234                 printf("%s Waiting for PHY auto negotiation to complete",
 235                         phydev->dev->name);
 236                 while (!(mii_reg & BMSR_ANEGCOMPLETE)) {
 237                         /*
 238                          * Timeout reached ?
 239                          */
 240                         if (i > PHY_ANEG_TIMEOUT) {
 241                                 printf(" TIMEOUT !\n");
 242                                 phydev->link = 0;
 243                                 return 0;
 244                         }
 245
 246                         if (ctrlc()) {
 247                                 puts("user interrupt!\n");
 248                                 phydev->link = 0;
 249                                 return -EINTR;
 250                         }
 251
 252                         if ((i++ % 500) == 0)
 253                                 printf(".");
 254
 255                         udelay(1000);   /* 1 ms */
 256                         mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 257                 }
 258                 printf(" done\n");
 259                 phydev->link = 1;
 260         } else {
 261                 /* Read the link a second time to clear the latched state */
 262                 mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 263
 264                 if (mii_reg & BMSR_LSTATUS)
 265                         phydev->link = 1;
 266                 else
 267                         phydev->link = 0;
 268         }
 269
 270         return 0;
 271 }
 272
 273 /*
 274  * Generic function which updates the speed and duplex.  If
 275  * autonegotiation is enabled, it uses the AND of the link
 276  * partner's advertised capabilities and our advertised
 277  * capabilities.  If autonegotiation is disabled, we use the
 278  * appropriate bits in the control register.
 279  *
 280  * Stolen from Linux's mii.c and phy_device.c
 281  */
 282 static int genphy_parse_link(struct phy_device *phydev)
 283 {
 284         int mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 285
 286         /* We're using autonegotiation */
 287         if (mii_reg & BMSR_ANEGCAPABLE) {
 288                 u32 lpa = 0;
 289                 u32 gblpa = 0;
 290
 291                 /* Check for gigabit capability */
 292                 if (mii_reg & BMSR_ERCAP) {
 293                         /* We want a list of states supported by
 294                          * both PHYs in the link
 295                          */
 296                         gblpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_STAT1000);
 297                         gblpa &= phy_read(phydev,
 298                                         MDIO_DEVAD_NONE, MII_CTRL1000) << 2;
 299                 }
 300
 301                 /* Set the baseline so we only have to set them
 302                  * if they're different
 303                  */
 304                 phydev->speed = SPEED_10;
 305                 phydev->duplex = DUPLEX_HALF;
 306
 307                 /* Check the gigabit fields */
 308                 if (gblpa & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
 309                         phydev->speed = SPEED_1000;
 310
 311                         if (gblpa & PHY_1000BTSR_1000FD)
 312                                 phydev->duplex = DUPLEX_FULL;
 313
 314                         /* We're done! */
 315                         return 0;
 316                 }
 317
 318                 lpa = phy_read(phydev, MDIO_DEVAD_NONE, MII_ADVERTISE);
 319                 lpa &= phy_read(phydev, MDIO_DEVAD_NONE, MII_LPA);
 320
 321                 if (lpa & (LPA_100FULL | LPA_100HALF)) {
 322                         phydev->speed = SPEED_100;
 323
 324                         if (lpa & LPA_100FULL)
 325                                 phydev->duplex = DUPLEX_FULL;
 326
 327                 } else if (lpa & LPA_10FULL)
 328                         phydev->duplex = DUPLEX_FULL;
 329         } else {
 330                 u32 bmcr = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMCR);
 331
 332                 phydev->speed = SPEED_10;
 333                 phydev->duplex = DUPLEX_HALF;
 334
 335                 if (bmcr & BMCR_FULLDPLX)
 336                         phydev->duplex = DUPLEX_FULL;
 337
 338                 if (bmcr & BMCR_SPEED1000)
 339                         phydev->speed = SPEED_1000;
 340                 else if (bmcr & BMCR_SPEED100)
 341                         phydev->speed = SPEED_100;
 342         }
 343
 344         return 0;
 345 }
 346
 347 int genphy_config(struct phy_device *phydev)
 348 {
 349         int val;
 350         u32 features;
 351
 352         /* For now, I'll claim that the generic driver supports
 353          * all possible port types */
 354         features = (SUPPORTED_TP | SUPPORTED_MII
 355                         | SUPPORTED_AUI | SUPPORTED_FIBRE |
 356                         SUPPORTED_BNC);
 357
 358         /* Do we support autonegotiation? */
 359         val = phy_read(phydev, MDIO_DEVAD_NONE, MII_BMSR);
 360
 361         if (val < 0)
 362                 return val;
 363
 364         if (val & BMSR_ANEGCAPABLE)
 365                 features |= SUPPORTED_Autoneg;
 366
 367         if (val & BMSR_100FULL)
 368                 features |= SUPPORTED_100baseT_Full;
 369         if (val & BMSR_100HALF)
 370                 features |= SUPPORTED_100baseT_Half;
 371         if (val & BMSR_10FULL)
 372                 features |= SUPPORTED_10baseT_Full;
 373         if (val & BMSR_10HALF)
 374                 features |= SUPPORTED_10baseT_Half;
 375
 376         if (val & BMSR_ESTATEN) {
 377                 val = phy_read(phydev, MDIO_DEVAD_NONE, MII_ESTATUS);
 378
 379                 if (val < 0)
 380                         return val;
 381
 382                 if (val & ESTATUS_1000_TFULL)
 383                         features |= SUPPORTED_1000baseT_Full;
 384                 if (val & ESTATUS_1000_THALF)
 385                         features |= SUPPORTED_1000baseT_Half;
 386         }
 387
 388         phydev->supported = features;
 389         phydev->advertising = features;
 390
 391         genphy_config_aneg(phydev);
 392
 393         return 0;
 394 }
 395
 396 int genphy_startup(struct phy_device *phydev)
 397 {
 398         genphy_update_link(phydev);
 399         genphy_parse_link(phydev);
 400
 401         return 0;
 402 }
 403
 404 int genphy_shutdown(struct phy_device *phydev)
 405 {
 406         return 0;
 407 }
 408
 409 static struct phy_driver genphy_driver = {
 410         .uid            = 0xffffffff,
 411         .mask           = 0xffffffff,
 412         .name           = "Generic PHY",
 413         .features       = 0,
 414         .config         = genphy_config,
 415         .startup        = genphy_startup,
 416         .shutdown       = genphy_shutdown,
 417 };
 418
 419 static LIST_HEAD(phy_drivers);
 420
 421 int phy_init(void)
 422 {
 423         return 0;
 424 }
 425
 426 int phy_register(struct phy_driver *drv)
 427 {
 428         INIT_LIST_HEAD(&drv->list);
 429         list_add_tail(&drv->list, &phy_drivers);
 430
 431         return 0;
 432 }
 433
 434 int phy_probe(struct phy_device *phydev)
 435 {
 436         int err = 0;
 437
 438         phydev->advertising = phydev->supported = phydev->drv->features;
 439         phydev->mmds = phydev->drv->mmds;
 440
 441         if (phydev->drv->probe)
 442                 err = phydev->drv->probe(phydev);
 443
 444         return err;
 445 }
 446
 447 static struct phy_driver *generic_for_interface(phy_interface_t interface)
 448 {
 449 #ifdef CONFIG_PHYLIB_10G
 450         if (is_10g_interface(interface))
 451                 return &gen10g_driver;
 452 #endif
 453
 454         return &genphy_driver;
 455 }
 456
 457 struct phy_driver *get_phy_driver(struct phy_device *phydev,
 458                                 phy_interface_t interface)
 459 {
 460         struct list_head *entry;
 461         int phy_id = phydev->phy_id;
 462         struct phy_driver *drv = NULL;
 463
 464         list_for_each(entry, &phy_drivers) {
 465                 drv = list_entry(entry, struct phy_driver, list);
 466                 if ((drv->uid & drv->mask) == (phy_id & drv->mask))
 467                         return drv;
 468         }
 469
 470         /* If we made it here, there's no driver for this PHY */
 471         return generic_for_interface(interface);
 472 }
 473
 474 struct phy_device *phy_device_create(struct mii_dev *bus, int addr, int phy_id,
 475                                         phy_interface_t interface)
 476 {
 477         struct phy_device *dev;
 478
 479         /* We allocate the device, and initialize the
 480          * default values */
 481         dev = malloc(sizeof(*dev));
 482         if (!dev) {
 483                 printf("Failed to allocate PHY device for %s:%d\n",
 484                         bus->name, addr);
 485                 return NULL;
 486         }
 487
 488         memset(dev, 0, sizeof(*dev));
 489
 490         dev->duplex = -1;
 491         dev->link = 1;
 492         dev->interface = interface;
 493
 494         dev->autoneg = AUTONEG_ENABLE;
 495
 496         dev->addr = addr;
 497         dev->phy_id = phy_id;
 498         dev->bus = bus;
 499
 500         dev->drv = get_phy_driver(dev, interface);
 501
 502         phy_probe(dev);
 503
 504         bus->phymap[addr] = dev;
 505
 506         return dev;
 507 }
 508
 509 /**
 510  * get_phy_id - reads the specified addr for its ID.
 511  * @bus: the target MII bus
 512  * @addr: PHY address on the MII bus
 513  * @phy_id: where to store the ID retrieved.
 514  *
 515  * Description: Reads the ID registers of the PHY at @addr on the
 516  *   @bus, stores it in @phy_id and returns zero on success.
 517  */
 518 int get_phy_id(struct mii_dev *bus, int addr, int devad, u32 *phy_id)
 519 {
 520         int phy_reg;
 521
 522         /* Grab the bits from PHYIR1, and put them
 523          * in the upper half */
 524         phy_reg = bus->read(bus, addr, devad, MII_PHYSID1);
 525
 526         if (phy_reg < 0)
 527                 return -EIO;
 528
 529         *phy_id = (phy_reg & 0xffff) << 16;
 530
 531         /* Grab the bits from PHYIR2, and put them in the lower half */
 532         phy_reg = bus->read(bus, addr, devad, MII_PHYSID2);
 533
 534         if (phy_reg < 0)
 535                 return -EIO;
 536
 537         *phy_id |= (phy_reg & 0xffff);
 538
 539         return 0;
 540 }
 541
 542 /**
 543  * get_phy_device - reads the specified PHY device and returns its @phy_device struct
 544  * @bus: the target MII bus
 545  * @addr: PHY address on the MII bus
 546  *
 547  * Description: Reads the ID registers of the PHY at @addr on the
 548  *   @bus, then allocates and returns the phy_device to represent it.
 549  */
 550 struct phy_device *get_phy_device(struct mii_dev *bus, int addr,
 551                                 phy_interface_t interface)
 552 {
 553         u32 phy_id = 0x1fffffff;
 554         int i;
 555         int r;
 556
 557         /* If we have one, return the existing device, with new interface */
 558         if (bus->phymap[addr]) {
 559                 bus->phymap[addr]->interface = interface;
 560
 561                 return bus->phymap[addr];
 562         }
 563
 564         /* Try Standard (ie Clause 22) access */
 565         r = get_phy_id(bus, addr, MDIO_DEVAD_NONE, &phy_id);
 566         if (r)
 567                 return NULL;
 568
 569         /* If the PHY ID is mostly f's, we didn't find anything */
 570         if ((phy_id & 0x1fffffff) != 0x1fffffff)
 571                 return phy_device_create(bus, addr, phy_id, interface);
 572
 573         /* Otherwise we have to try Clause 45 */
 574         for (i = 1; i < 5; i++) {
 575                 r = get_phy_id(bus, addr, i, &phy_id);
 576                 if (r)
 577                         return NULL;
 578
 579                 /* If the phy_id is mostly Fs, there is no device there */
 580                 if ((phy_id & 0x1fffffff) != 0x1fffffff)
 581                         break;
 582         }
 583
 584         return phy_device_create(bus, addr, phy_id, interface);
 585 }
 586
 587 int phy_reset(struct phy_device *phydev)
 588 {
 589         int reg;
 590         int timeout = 500;
 591         int devad = MDIO_DEVAD_NONE;
 592
 593 #ifdef CONFIG_PHYLIB_10G
 594         /* If it's 10G, we need to issue reset through one of the MMDs */
 595         if (is_10g_interface(phydev->interface)) {
 596                 if (!phydev->mmds)
 597                         gen10g_discover_mmds(phydev);
 598
 599                 devad = ffs(phydev->mmds) - 1;
 600         }
 601 #endif
 602
 603         reg = phy_read(phydev, devad, MII_BMCR);
 604         if (reg < 0) {
 605                 debug("PHY status read failed\n");
 606                 return -1;
 607         }
 608
 609         reg |= BMCR_RESET;
 610
 611         if (phy_write(phydev, devad, MII_BMCR, reg) < 0) {
 612                 debug("PHY reset failed\n");
 613                 return -1;
 614         }
 615
 616 #ifdef CONFIG_PHY_RESET_DELAY
 617         udelay(CONFIG_PHY_RESET_DELAY); /* Intel LXT971A needs this */
 618 #endif
 619         /*
 620          * Poll the control register for the reset bit to go to 0 (it is
 621          * auto-clearing).  This should happen within 0.5 seconds per the
 622          * IEEE spec.
 623          */
 624         while ((reg & BMCR_RESET) && timeout--) {
 625                 reg = phy_read(phydev, devad, MII_BMCR);
 626
 627                 if (reg < 0) {
 628                         debug("PHY status read failed\n");
 629                         return -1;
 630                 }
 631                 udelay(1000);
 632         }
 633
 634         if (reg & BMCR_RESET) {
 635                 puts("PHY reset timed out\n");
 636                 return -1;
 637         }
 638
 639         return 0;
 640 }
 641
 642 int miiphy_reset(const char *devname, unsigned char addr)
 643 {
 644         struct mii_dev *bus = miiphy_get_dev_by_name(devname);
 645         struct phy_device *phydev;
 646
 647         /*
 648          * miiphy_reset was only used on standard PHYs, so we'll fake it here.
 649          * If later code tries to connect with the right interface, this will
 650          * be corrected by get_phy_device in phy_connect()
 651          */
 652         phydev = get_phy_device(bus, addr, PHY_INTERFACE_MODE_MII);
 653
 654         return phy_reset(phydev);
 655 }
 656
 657 struct phy_device *phy_connect(struct mii_dev *bus, int addr,
 658                                 struct eth_device *dev,
 659                                 phy_interface_t interface)
 660 {
 661         struct phy_device *phydev;
 662
 663         /* Reset the bus */
 664         bus->reset(bus);
 665
 666         /* Wait 15ms to make sure the PHY has come out of hard reset */
 667         udelay(15000);
 668
 669         phydev = get_phy_device(bus, addr, interface);
 670
 671         if (!phydev) {
 672                 printf("Could not get PHY for %s:%d\n", bus->name, addr);
 673
 674                 return NULL;
 675         }
 676
 677         /* Soft Reset the PHY */
 678         phy_reset(phydev);
 679
 680         if (phydev->dev)
 681                 printf("%s:%d is connected to %s.  Reconnecting to %s\n",
 682                         bus->name, addr, phydev->dev->name, dev->name);
 683
 684         phydev->dev = dev;
 685
 686         printf("%s connected to %s\n", dev->name, phydev->drv->name);
 687
 688         return phydev;
 689 }
 690
 691 int phy_startup(struct phy_device *phydev)
 692 {
 693         if (phydev->drv->startup)
 694                 phydev->drv->startup(phydev);
 695
 696         return 0;
 697 }
 698
 699 static int __board_phy_config(struct phy_device *phydev)
 700 {
 701         return 0;
 702 }
 703
 704 int board_phy_config(struct phy_device *phydev)
 705         __attribute__((weak, alias("__board_phy_config")));
 706
 707 int phy_config(struct phy_device *phydev)
 708 {
 709         if (phydev->drv->config)
 710                 phydev->drv->config(phydev);
 711
 712         /* Invoke an optional board-specific helper */
 713         board_phy_config(phydev);
 714
 715         return 0;
 716 }
 717
 718 int phy_shutdown(struct phy_device *phydev)
 719 {
 720         if (phydev->drv->shutdown)
 721                 phydev->drv->shutdown(phydev);
 722
 723         return 0;
 724 }