drivers/core/device.c

   1 /*
   2  * Device manager
   3  *
   4  * Copyright (c) 2013 Google, Inc
   5  *
   6  * (C) Copyright 2012
   7  * Pavel Herrmann <morpheus.ibis@gmail.com>
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <asm/io.h>
  14 #include <fdtdec.h>
  15 #include <fdt_support.h>
  16 #include <malloc.h>
  17 #include <dm/device.h>
  18 #include <dm/device-internal.h>
  19 #include <dm/lists.h>
  20 #include <dm/pinctrl.h>
  21 #include <dm/platdata.h>
  22 #include <dm/uclass.h>
  23 #include <dm/uclass-internal.h>
  24 #include <dm/util.h>
  25 #include <linux/err.h>
  26 #include <linux/list.h>
  27
  28 DECLARE_GLOBAL_DATA_PTR;
  29
  30 static int device_bind_common(struct udevice *parent, const struct driver *drv,
  31                               const char *name, void *platdata,
  32                               ulong driver_data, int of_offset,
  33                               uint of_platdata_size, struct udevice **devp)
  34 {
  35         struct udevice *dev;
  36         struct uclass *uc;
  37         int size, ret = 0;
  38
  39         if (devp)
  40                 *devp = NULL;
  41         if (!name)
  42                 return -EINVAL;
  43
  44         ret = uclass_get(drv->id, &uc);
  45         if (ret) {
  46                 debug("Missing uclass for driver %s\n", drv->name);
  47                 return ret;
  48         }
  49
  50         dev = calloc(1, sizeof(struct udevice));
  51         if (!dev)
  52                 return -ENOMEM;
  53
  54         INIT_LIST_HEAD(&dev->sibling_node);
  55         INIT_LIST_HEAD(&dev->child_head);
  56         INIT_LIST_HEAD(&dev->uclass_node);
  57 #ifdef CONFIG_DEVRES
  58         INIT_LIST_HEAD(&dev->devres_head);
  59 #endif
  60         dev->platdata = platdata;
  61         dev->driver_data = driver_data;
  62         dev->name = name;
  63         dev->of_offset = of_offset;
  64         dev->parent = parent;
  65         dev->driver = drv;
  66         dev->uclass = uc;
  67
  68         dev->seq = -1;
  69         dev->req_seq = -1;
  70         if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
  71                 /*
  72                  * Some devices, such as a SPI bus, I2C bus and serial ports
  73                  * are numbered using aliases.
  74                  *
  75                  * This is just a 'requested' sequence, and will be
  76                  * resolved (and ->seq updated) when the device is probed.
  77                  */
  78                 if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
  79                         if (uc->uc_drv->name && of_offset != -1) {
  80                                 fdtdec_get_alias_seq(gd->fdt_blob,
  81                                                 uc->uc_drv->name, of_offset,
  82                                                 &dev->req_seq);
  83                         }
  84                 }
  85         }
  86
  87         if (drv->platdata_auto_alloc_size) {
  88                 bool alloc = !platdata;
  89
  90                 if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
  91                         if (of_platdata_size) {
  92                                 dev->flags |= DM_FLAG_OF_PLATDATA;
  93                                 if (of_platdata_size <
  94                                                 drv->platdata_auto_alloc_size)
  95                                         alloc = true;
  96                         }
  97                 }
  98                 if (alloc) {
  99                         dev->flags |= DM_FLAG_ALLOC_PDATA;
 100                         dev->platdata = calloc(1,
 101                                                drv->platdata_auto_alloc_size);
 102                         if (!dev->platdata) {
 103                                 ret = -ENOMEM;
 104                                 goto fail_alloc1;
 105                         }
 106                         if (CONFIG_IS_ENABLED(OF_PLATDATA) && platdata) {
 107                                 memcpy(dev->platdata, platdata,
 108                                        of_platdata_size);
 109                         }
 110                 }
 111         }
 112
 113         size = uc->uc_drv->per_device_platdata_auto_alloc_size;
 114         if (size) {
 115                 dev->flags |= DM_FLAG_ALLOC_UCLASS_PDATA;
 116                 dev->uclass_platdata = calloc(1, size);
 117                 if (!dev->uclass_platdata) {
 118                         ret = -ENOMEM;
 119                         goto fail_alloc2;
 120                 }
 121         }
 122
 123         if (parent) {
 124                 size = parent->driver->per_child_platdata_auto_alloc_size;
 125                 if (!size) {
 126                         size = parent->uclass->uc_drv->
 127                                         per_child_platdata_auto_alloc_size;
 128                 }
 129                 if (size) {
 130                         dev->flags |= DM_FLAG_ALLOC_PARENT_PDATA;
 131                         dev->parent_platdata = calloc(1, size);
 132                         if (!dev->parent_platdata) {
 133                                 ret = -ENOMEM;
 134                                 goto fail_alloc3;
 135                         }
 136                 }
 137         }
 138
 139         /* put dev into parent's successor list */
 140         if (parent)
 141                 list_add_tail(&dev->sibling_node, &parent->child_head);
 142
 143         ret = uclass_bind_device(dev);
 144         if (ret)
 145                 goto fail_uclass_bind;
 146
 147         /* if we fail to bind we remove device from successors and free it */
 148         if (drv->bind) {
 149                 ret = drv->bind(dev);
 150                 if (ret)
 151                         goto fail_bind;
 152         }
 153         if (parent && parent->driver->child_post_bind) {
 154                 ret = parent->driver->child_post_bind(dev);
 155                 if (ret)
 156                         goto fail_child_post_bind;
 157         }
 158         if (uc->uc_drv->post_bind) {
 159                 ret = uc->uc_drv->post_bind(dev);
 160                 if (ret)
 161                         goto fail_uclass_post_bind;
 162         }
 163
 164         if (parent)
 165                 dm_dbg("Bound device %s to %s\n", dev->name, parent->name);
 166         if (devp)
 167                 *devp = dev;
 168
 169         dev->flags |= DM_FLAG_BOUND;
 170
 171         return 0;
 172
 173 fail_uclass_post_bind:
 174         /* There is no child unbind() method, so no clean-up required */
 175 fail_child_post_bind:
 176         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
 177                 if (drv->unbind && drv->unbind(dev)) {
 178                         dm_warn("unbind() method failed on dev '%s' on error path\n",
 179                                 dev->name);
 180                 }
 181         }
 182
 183 fail_bind:
 184         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
 185                 if (uclass_unbind_device(dev)) {
 186                         dm_warn("Failed to unbind dev '%s' on error path\n",
 187                                 dev->name);
 188                 }
 189         }
 190 fail_uclass_bind:
 191         if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
 192                 list_del(&dev->sibling_node);
 193                 if (dev->flags & DM_FLAG_ALLOC_PARENT_PDATA) {
 194                         free(dev->parent_platdata);
 195                         dev->parent_platdata = NULL;
 196                 }
 197         }
 198 fail_alloc3:
 199         if (dev->flags & DM_FLAG_ALLOC_UCLASS_PDATA) {
 200                 free(dev->uclass_platdata);
 201                 dev->uclass_platdata = NULL;
 202         }
 203 fail_alloc2:
 204         if (dev->flags & DM_FLAG_ALLOC_PDATA) {
 205                 free(dev->platdata);
 206                 dev->platdata = NULL;
 207         }
 208 fail_alloc1:
 209         devres_release_all(dev);
 210
 211         free(dev);
 212
 213         return ret;
 214 }
 215
 216 int device_bind_with_driver_data(struct udevice *parent,
 217                                  const struct driver *drv, const char *name,
 218                                  ulong driver_data, int of_offset,
 219                                  struct udevice **devp)
 220 {
 221         return device_bind_common(parent, drv, name, NULL, driver_data,
 222                                   of_offset, 0, devp);
 223 }
 224
 225 int device_bind(struct udevice *parent, const struct driver *drv,
 226                 const char *name, void *platdata, int of_offset,
 227                 struct udevice **devp)
 228 {
 229         return device_bind_common(parent, drv, name, platdata, 0, of_offset, 0,
 230                                   devp);
 231 }
 232
 233 int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
 234                         const struct driver_info *info, struct udevice **devp)
 235 {
 236         struct driver *drv;
 237         uint platdata_size = 0;
 238
 239         drv = lists_driver_lookup_name(info->name);
 240         if (!drv)
 241                 return -ENOENT;
 242         if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
 243                 return -EPERM;
 244
 245 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 246         platdata_size = info->platdata_size;
 247 #endif
 248         return device_bind_common(parent, drv, info->name,
 249                         (void *)info->platdata, 0, -1, platdata_size, devp);
 250 }
 251
 252 static void *alloc_priv(int size, uint flags)
 253 {
 254         void *priv;
 255
 256         if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
 257                 priv = memalign(ARCH_DMA_MINALIGN, size);
 258                 if (priv)
 259                         memset(priv, '\0', size);
 260         } else {
 261                 priv = calloc(1, size);
 262         }
 263
 264         return priv;
 265 }
 266
 267 int device_probe(struct udevice *dev)
 268 {
 269         const struct driver *drv;
 270         int size = 0;
 271         int ret;
 272         int seq;
 273
 274         if (!dev)
 275                 return -EINVAL;
 276
 277         if (dev->flags & DM_FLAG_ACTIVATED)
 278                 return 0;
 279
 280         drv = dev->driver;
 281         assert(drv);
 282
 283         /* Allocate private data if requested and not reentered */
 284         if (drv->priv_auto_alloc_size && !dev->priv) {
 285                 dev->priv = alloc_priv(drv->priv_auto_alloc_size, drv->flags);
 286                 if (!dev->priv) {
 287                         ret = -ENOMEM;
 288                         goto fail;
 289                 }
 290         }
 291         /* Allocate private data if requested and not reentered */
 292         size = dev->uclass->uc_drv->per_device_auto_alloc_size;
 293         if (size && !dev->uclass_priv) {
 294                 dev->uclass_priv = calloc(1, size);
 295                 if (!dev->uclass_priv) {
 296                         ret = -ENOMEM;
 297                         goto fail;
 298                 }
 299         }
 300
 301         /* Ensure all parents are probed */
 302         if (dev->parent) {
 303                 size = dev->parent->driver->per_child_auto_alloc_size;
 304                 if (!size) {
 305                         size = dev->parent->uclass->uc_drv->
 306                                         per_child_auto_alloc_size;
 307                 }
 308                 if (size && !dev->parent_priv) {
 309                         dev->parent_priv = alloc_priv(size, drv->flags);
 310                         if (!dev->parent_priv) {
 311                                 ret = -ENOMEM;
 312                                 goto fail;
 313                         }
 314                 }
 315
 316                 ret = device_probe(dev->parent);
 317                 if (ret)
 318                         goto fail;
 319
 320                 /*
 321                  * The device might have already been probed during
 322                  * the call to device_probe() on its parent device
 323                  * (e.g. PCI bridge devices). Test the flags again
 324                  * so that we don't mess up the device.
 325                  */
 326                 if (dev->flags & DM_FLAG_ACTIVATED)
 327                         return 0;
 328         }
 329
 330         seq = uclass_resolve_seq(dev);
 331         if (seq < 0) {
 332                 ret = seq;
 333                 goto fail;
 334         }
 335         dev->seq = seq;
 336
 337         dev->flags |= DM_FLAG_ACTIVATED;
 338
 339         /*
 340          * Process pinctrl for everything except the root device, and
 341          * continue regardless of the result of pinctrl. Don't process pinctrl
 342          * settings for pinctrl devices since the device may not yet be
 343          * probed.
 344          */
 345         if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
 346                 pinctrl_select_state(dev, "default");
 347
 348         ret = uclass_pre_probe_device(dev);
 349         if (ret)
 350                 goto fail;
 351
 352         if (dev->parent && dev->parent->driver->child_pre_probe) {
 353                 ret = dev->parent->driver->child_pre_probe(dev);
 354                 if (ret)
 355                         goto fail;
 356         }
 357
 358         if (drv->ofdata_to_platdata && dev->of_offset >= 0) {
 359                 ret = drv->ofdata_to_platdata(dev);
 360                 if (ret)
 361                         goto fail;
 362         }
 363
 364         if (drv->probe) {
 365                 ret = drv->probe(dev);
 366                 if (ret) {
 367                         dev->flags &= ~DM_FLAG_ACTIVATED;
 368                         goto fail;
 369                 }
 370         }
 371
 372         ret = uclass_post_probe_device(dev);
 373         if (ret)
 374                 goto fail_uclass;
 375
 376         if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
 377                 pinctrl_select_state(dev, "default");
 378
 379         return 0;
 380 fail_uclass:
 381         if (device_remove(dev)) {
 382                 dm_warn("%s: Device '%s' failed to remove on error path\n",
 383                         __func__, dev->name);
 384         }
 385 fail:
 386         dev->flags &= ~DM_FLAG_ACTIVATED;
 387
 388         dev->seq = -1;
 389         device_free(dev);
 390
 391         return ret;
 392 }
 393
 394 void *dev_get_platdata(struct udevice *dev)
 395 {
 396         if (!dev) {
 397                 dm_warn("%s: null device\n", __func__);
 398                 return NULL;
 399         }
 400
 401         return dev->platdata;
 402 }
 403
 404 void *dev_get_parent_platdata(struct udevice *dev)
 405 {
 406         if (!dev) {
 407                 dm_warn("%s: null device\n", __func__);
 408                 return NULL;
 409         }
 410
 411         return dev->parent_platdata;
 412 }
 413
 414 void *dev_get_uclass_platdata(struct udevice *dev)
 415 {
 416         if (!dev) {
 417                 dm_warn("%s: null device\n", __func__);
 418                 return NULL;
 419         }
 420
 421         return dev->uclass_platdata;
 422 }
 423
 424 void *dev_get_priv(struct udevice *dev)
 425 {
 426         if (!dev) {
 427                 dm_warn("%s: null device\n", __func__);
 428                 return NULL;
 429         }
 430
 431         return dev->priv;
 432 }
 433
 434 void *dev_get_uclass_priv(struct udevice *dev)
 435 {
 436         if (!dev) {
 437                 dm_warn("%s: null device\n", __func__);
 438                 return NULL;
 439         }
 440
 441         return dev->uclass_priv;
 442 }
 443
 444 void *dev_get_parent_priv(struct udevice *dev)
 445 {
 446         if (!dev) {
 447                 dm_warn("%s: null device\n", __func__);
 448                 return NULL;
 449         }
 450
 451         return dev->parent_priv;
 452 }
 453
 454 static int device_get_device_tail(struct udevice *dev, int ret,
 455                                   struct udevice **devp)
 456 {
 457         if (ret)
 458                 return ret;
 459
 460         ret = device_probe(dev);
 461         if (ret)
 462                 return ret;
 463
 464         *devp = dev;
 465
 466         return 0;
 467 }
 468
 469 int device_get_child(struct udevice *parent, int index, struct udevice **devp)
 470 {
 471         struct udevice *dev;
 472
 473         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 474                 if (!index--)
 475                         return device_get_device_tail(dev, 0, devp);
 476         }
 477
 478         return -ENODEV;
 479 }
 480
 481 int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq,
 482                              bool find_req_seq, struct udevice **devp)
 483 {
 484         struct udevice *dev;
 485
 486         *devp = NULL;
 487         if (seq_or_req_seq == -1)
 488                 return -ENODEV;
 489
 490         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 491                 if ((find_req_seq ? dev->req_seq : dev->seq) ==
 492                                 seq_or_req_seq) {
 493                         *devp = dev;
 494                         return 0;
 495                 }
 496         }
 497
 498         return -ENODEV;
 499 }
 500
 501 int device_get_child_by_seq(struct udevice *parent, int seq,
 502                             struct udevice **devp)
 503 {
 504         struct udevice *dev;
 505         int ret;
 506
 507         *devp = NULL;
 508         ret = device_find_child_by_seq(parent, seq, false, &dev);
 509         if (ret == -ENODEV) {
 510                 /*
 511                  * We didn't find it in probed devices. See if there is one
 512                  * that will request this seq if probed.
 513                  */
 514                 ret = device_find_child_by_seq(parent, seq, true, &dev);
 515         }
 516         return device_get_device_tail(dev, ret, devp);
 517 }
 518
 519 int device_find_child_by_of_offset(struct udevice *parent, int of_offset,
 520                                    struct udevice **devp)
 521 {
 522         struct udevice *dev;
 523
 524         *devp = NULL;
 525
 526         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 527                 if (dev->of_offset == of_offset) {
 528                         *devp = dev;
 529                         return 0;
 530                 }
 531         }
 532
 533         return -ENODEV;
 534 }
 535
 536 int device_get_child_by_of_offset(struct udevice *parent, int node,
 537                                   struct udevice **devp)
 538 {
 539         struct udevice *dev;
 540         int ret;
 541
 542         *devp = NULL;
 543         ret = device_find_child_by_of_offset(parent, node, &dev);
 544         return device_get_device_tail(dev, ret, devp);
 545 }
 546
 547 static struct udevice *_device_find_global_by_of_offset(struct udevice *parent,
 548                                                         int of_offset)
 549 {
 550         struct udevice *dev, *found;
 551
 552         if (parent->of_offset == of_offset)
 553                 return parent;
 554
 555         list_for_each_entry(dev, &parent->child_head, sibling_node) {
 556                 found = _device_find_global_by_of_offset(dev, of_offset);
 557                 if (found)
 558                         return found;
 559         }
 560
 561         return NULL;
 562 }
 563
 564 int device_get_global_by_of_offset(int of_offset, struct udevice **devp)
 565 {
 566         struct udevice *dev;
 567
 568         dev = _device_find_global_by_of_offset(gd->dm_root, of_offset);
 569         return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
 570 }
 571
 572 int device_find_first_child(struct udevice *parent, struct udevice **devp)
 573 {
 574         if (list_empty(&parent->child_head)) {
 575                 *devp = NULL;
 576         } else {
 577                 *devp = list_first_entry(&parent->child_head, struct udevice,
 578                                          sibling_node);
 579         }
 580
 581         return 0;
 582 }
 583
 584 int device_find_next_child(struct udevice **devp)
 585 {
 586         struct udevice *dev = *devp;
 587         struct udevice *parent = dev->parent;
 588
 589         if (list_is_last(&dev->sibling_node, &parent->child_head)) {
 590                 *devp = NULL;
 591         } else {
 592                 *devp = list_entry(dev->sibling_node.next, struct udevice,
 593                                    sibling_node);
 594         }
 595
 596         return 0;
 597 }
 598
 599 struct udevice *dev_get_parent(struct udevice *child)
 600 {
 601         return child->parent;
 602 }
 603
 604 ulong dev_get_driver_data(struct udevice *dev)
 605 {
 606         return dev->driver_data;
 607 }
 608
 609 const void *dev_get_driver_ops(struct udevice *dev)
 610 {
 611         if (!dev || !dev->driver->ops)
 612                 return NULL;
 613
 614         return dev->driver->ops;
 615 }
 616
 617 enum uclass_id device_get_uclass_id(struct udevice *dev)
 618 {
 619         return dev->uclass->uc_drv->id;
 620 }
 621
 622 const char *dev_get_uclass_name(struct udevice *dev)
 623 {
 624         if (!dev)
 625                 return NULL;
 626
 627         return dev->uclass->uc_drv->name;
 628 }
 629
 630 fdt_addr_t dev_get_addr_index(struct udevice *dev, int index)
 631 {
 632 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
 633         fdt_addr_t addr;
 634
 635         if (CONFIG_IS_ENABLED(OF_TRANSLATE)) {
 636                 const fdt32_t *reg;
 637                 int len = 0;
 638                 int na, ns;
 639
 640                 na = fdt_address_cells(gd->fdt_blob, dev->parent->of_offset);
 641                 if (na < 1) {
 642                         debug("bad #address-cells\n");
 643                         return FDT_ADDR_T_NONE;
 644                 }
 645
 646                 ns = fdt_size_cells(gd->fdt_blob, dev->parent->of_offset);
 647                 if (ns < 0) {
 648                         debug("bad #size-cells\n");
 649                         return FDT_ADDR_T_NONE;
 650                 }
 651
 652                 reg = fdt_getprop(gd->fdt_blob, dev->of_offset, "reg", &len);
 653                 if (!reg || (len <= (index * sizeof(fdt32_t) * (na + ns)))) {
 654                         debug("Req index out of range\n");
 655                         return FDT_ADDR_T_NONE;
 656                 }
 657
 658                 reg += index * (na + ns);
 659
 660                 /*
 661                  * Use the full-fledged translate function for complex
 662                  * bus setups.
 663                  */
 664                 addr = fdt_translate_address((void *)gd->fdt_blob,
 665                                              dev->of_offset, reg);
 666         } else {
 667                 /*
 668                  * Use the "simple" translate function for less complex
 669                  * bus setups.
 670                  */
 671                 addr = fdtdec_get_addr_size_auto_parent(gd->fdt_blob,
 672                                                         dev->parent->of_offset,
 673                                                         dev->of_offset, "reg",
 674                                                         index, NULL, false);
 675                 if (CONFIG_IS_ENABLED(SIMPLE_BUS) && addr != FDT_ADDR_T_NONE) {
 676                         if (device_get_uclass_id(dev->parent) ==
 677                             UCLASS_SIMPLE_BUS)
 678                                 addr = simple_bus_translate(dev->parent, addr);
 679                 }
 680         }
 681
 682         /*
 683          * Some platforms need a special address translation. Those
 684          * platforms (e.g. mvebu in SPL) can configure a translation
 685          * offset in the DM by calling dm_set_translation_offset() that
 686          * will get added to all addresses returned by dev_get_addr().
 687          */
 688         addr += dm_get_translation_offset();
 689
 690         return addr;
 691 #else
 692         return FDT_ADDR_T_NONE;
 693 #endif
 694 }
 695
 696 fdt_addr_t dev_get_addr_size_index(struct udevice *dev, int index,
 697                                    fdt_size_t *size)
 698 {
 699 #if CONFIG_IS_ENABLED(OF_CONTROL)
 700         /*
 701          * Only get the size in this first call. We'll get the addr in the
 702          * next call to the exisiting dev_get_xxx function which handles
 703          * all config options.
 704          */
 705         fdtdec_get_addr_size_auto_noparent(gd->fdt_blob, dev->of_offset,
 706                                            "reg", index, size, false);
 707
 708         /*
 709          * Get the base address via the existing function which handles
 710          * all Kconfig cases
 711          */
 712         return dev_get_addr_index(dev, index);
 713 #else
 714         return FDT_ADDR_T_NONE;
 715 #endif
 716 }
 717
 718 fdt_addr_t dev_get_addr_name(struct udevice *dev, const char *name)
 719 {
 720 #if CONFIG_IS_ENABLED(OF_CONTROL)
 721         int index;
 722
 723         index = fdt_stringlist_search(gd->fdt_blob, dev->of_offset,
 724                                       "reg-names", name);
 725         if (index < 0)
 726                 return index;
 727
 728         return dev_get_addr_index(dev, index);
 729 #else
 730         return FDT_ADDR_T_NONE;
 731 #endif
 732 }
 733
 734 fdt_addr_t dev_get_addr(struct udevice *dev)
 735 {
 736         return dev_get_addr_index(dev, 0);
 737 }
 738
 739 void *dev_get_addr_ptr(struct udevice *dev)
 740 {
 741         return (void *)(uintptr_t)dev_get_addr_index(dev, 0);
 742 }
 743
 744 void *dev_map_physmem(struct udevice *dev, unsigned long size)
 745 {
 746         fdt_addr_t addr = dev_get_addr(dev);
 747
 748         if (addr == FDT_ADDR_T_NONE)
 749                 return NULL;
 750
 751         return map_physmem(addr, size, MAP_NOCACHE);
 752 }
 753
 754 bool device_has_children(struct udevice *dev)
 755 {
 756         return !list_empty(&dev->child_head);
 757 }
 758
 759 bool device_has_active_children(struct udevice *dev)
 760 {
 761         struct udevice *child;
 762
 763         for (device_find_first_child(dev, &child);
 764              child;
 765              device_find_next_child(&child)) {
 766                 if (device_active(child))
 767                         return true;
 768         }
 769
 770         return false;
 771 }
 772
 773 bool device_is_last_sibling(struct udevice *dev)
 774 {
 775         struct udevice *parent = dev->parent;
 776
 777         if (!parent)
 778                 return false;
 779         return list_is_last(&dev->sibling_node, &parent->child_head);
 780 }
 781
 782 void device_set_name_alloced(struct udevice *dev)
 783 {
 784         dev->flags |= DM_FLAG_NAME_ALLOCED;
 785 }
 786
 787 int device_set_name(struct udevice *dev, const char *name)
 788 {
 789         name = strdup(name);
 790         if (!name)
 791                 return -ENOMEM;
 792         dev->name = name;
 793         device_set_name_alloced(dev);
 794
 795         return 0;
 796 }
 797
 798 bool of_device_is_compatible(struct udevice *dev, const char *compat)
 799 {
 800         const void *fdt = gd->fdt_blob;
 801
 802         return !fdt_node_check_compatible(fdt, dev->of_offset, compat);
 803 }
 804
 805 bool of_machine_is_compatible(const char *compat)
 806 {
 807         const void *fdt = gd->fdt_blob;
 808
 809         return !fdt_node_check_compatible(fdt, 0, compat);
 810 }