test/dm/core.c

   1 /*
   2  * Tests for the core driver model code
   3  *
   4  * Copyright (c) 2013 Google, Inc
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <errno.h>
  11 #include <dm.h>
  12 #include <fdtdec.h>
  13 #include <malloc.h>
  14 #include <dm/device-internal.h>
  15 #include <dm/root.h>
  16 #include <dm/ut.h>
  17 #include <dm/util.h>
  18 #include <dm/test.h>
  19 #include <dm/uclass-internal.h>
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 enum {
  24         TEST_INTVAL1            = 0,
  25         TEST_INTVAL2            = 3,
  26         TEST_INTVAL3            = 6,
  27         TEST_INTVAL_MANUAL      = 101112,
  28         TEST_INTVAL_PRE_RELOC   = 7,
  29 };
  30
  31 static const struct dm_test_pdata test_pdata[] = {
  32         { .ping_add             = TEST_INTVAL1, },
  33         { .ping_add             = TEST_INTVAL2, },
  34         { .ping_add             = TEST_INTVAL3, },
  35 };
  36
  37 static const struct dm_test_pdata test_pdata_manual = {
  38         .ping_add               = TEST_INTVAL_MANUAL,
  39 };
  40
  41 static const struct dm_test_pdata test_pdata_pre_reloc = {
  42         .ping_add               = TEST_INTVAL_PRE_RELOC,
  43 };
  44
  45 U_BOOT_DEVICE(dm_test_info1) = {
  46         .name = "test_drv",
  47         .platdata = &test_pdata[0],
  48 };
  49
  50 U_BOOT_DEVICE(dm_test_info2) = {
  51         .name = "test_drv",
  52         .platdata = &test_pdata[1],
  53 };
  54
  55 U_BOOT_DEVICE(dm_test_info3) = {
  56         .name = "test_drv",
  57         .platdata = &test_pdata[2],
  58 };
  59
  60 static struct driver_info driver_info_manual = {
  61         .name = "test_manual_drv",
  62         .platdata = &test_pdata_manual,
  63 };
  64
  65 static struct driver_info driver_info_pre_reloc = {
  66         .name = "test_pre_reloc_drv",
  67         .platdata = &test_pdata_manual,
  68 };
  69
  70 void dm_leak_check_start(struct dm_test_state *dms)
  71 {
  72         dms->start = mallinfo();
  73         if (!dms->start.uordblks)
  74                 puts("Warning: Please add '#define DEBUG' to the top of common/dlmalloc.c\n");
  75 }
  76
  77 int dm_leak_check_end(struct dm_test_state *dms)
  78 {
  79         struct mallinfo end;
  80         int id;
  81
  82         /* Don't delete the root class, since we started with that */
  83         for (id = UCLASS_ROOT + 1; id < UCLASS_COUNT; id++) {
  84                 struct uclass *uc;
  85
  86                 uc = uclass_find(id);
  87                 if (!uc)
  88                         continue;
  89                 ut_assertok(uclass_destroy(uc));
  90         }
  91
  92         end = mallinfo();
  93         ut_asserteq(dms->start.uordblks, end.uordblks);
  94
  95         return 0;
  96 }
  97
  98 /* Test that binding with platdata occurs correctly */
  99 static int dm_test_autobind(struct dm_test_state *dms)
 100 {
 101         struct udevice *dev;
 102
 103         /*
 104          * We should have a single class (UCLASS_ROOT) and a single root
 105          * device with no children.
 106          */
 107         ut_assert(dms->root);
 108         ut_asserteq(1, list_count_items(&gd->uclass_root));
 109         ut_asserteq(0, list_count_items(&gd->dm_root->child_head));
 110         ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_POST_BIND]);
 111
 112         ut_assertok(dm_scan_platdata(false));
 113
 114         /* We should have our test class now at least, plus more children */
 115         ut_assert(1 < list_count_items(&gd->uclass_root));
 116         ut_assert(0 < list_count_items(&gd->dm_root->child_head));
 117
 118         /* Our 3 dm_test_infox children should be bound to the test uclass */
 119         ut_asserteq(3, dm_testdrv_op_count[DM_TEST_OP_POST_BIND]);
 120
 121         /* No devices should be probed */
 122         list_for_each_entry(dev, &gd->dm_root->child_head, sibling_node)
 123                 ut_assert(!(dev->flags & DM_FLAG_ACTIVATED));
 124
 125         /* Our test driver should have been bound 3 times */
 126         ut_assert(dm_testdrv_op_count[DM_TEST_OP_BIND] == 3);
 127
 128         return 0;
 129 }
 130 DM_TEST(dm_test_autobind, 0);
 131
 132 /* Test that autoprobe finds all the expected devices */
 133 static int dm_test_autoprobe(struct dm_test_state *dms)
 134 {
 135         int expected_base_add;
 136         struct udevice *dev;
 137         struct uclass *uc;
 138         int i;
 139
 140         ut_assertok(uclass_get(UCLASS_TEST, &uc));
 141         ut_assert(uc);
 142
 143         ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_INIT]);
 144         ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_PRE_PROBE]);
 145         ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_POST_PROBE]);
 146
 147         /* The root device should not be activated until needed */
 148         ut_assert(dms->root->flags & DM_FLAG_ACTIVATED);
 149
 150         /*
 151          * We should be able to find the three test devices, and they should
 152          * all be activated as they are used (lazy activation, required by
 153          * U-Boot)
 154          */
 155         for (i = 0; i < 3; i++) {
 156                 ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
 157                 ut_assert(dev);
 158                 ut_assertf(!(dev->flags & DM_FLAG_ACTIVATED),
 159                            "Driver %d/%s already activated", i, dev->name);
 160
 161                 /* This should activate it */
 162                 ut_assertok(uclass_get_device(UCLASS_TEST, i, &dev));
 163                 ut_assert(dev);
 164                 ut_assert(dev->flags & DM_FLAG_ACTIVATED);
 165
 166                 /* Activating a device should activate the root device */
 167                 if (!i)
 168                         ut_assert(dms->root->flags & DM_FLAG_ACTIVATED);
 169         }
 170
 171         /*
 172          * Our 3 dm_test_info children should be passed to pre_probe and
 173          * post_probe
 174          */
 175         ut_asserteq(3, dm_testdrv_op_count[DM_TEST_OP_POST_PROBE]);
 176         ut_asserteq(3, dm_testdrv_op_count[DM_TEST_OP_PRE_PROBE]);
 177
 178         /* Also we can check the per-device data */
 179         expected_base_add = 0;
 180         for (i = 0; i < 3; i++) {
 181                 struct dm_test_uclass_perdev_priv *priv;
 182                 struct dm_test_pdata *pdata;
 183
 184                 ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
 185                 ut_assert(dev);
 186
 187                 priv = dev_get_uclass_priv(dev);
 188                 ut_assert(priv);
 189                 ut_asserteq(expected_base_add, priv->base_add);
 190
 191                 pdata = dev->platdata;
 192                 expected_base_add += pdata->ping_add;
 193         }
 194
 195         return 0;
 196 }
 197 DM_TEST(dm_test_autoprobe, DM_TESTF_SCAN_PDATA);
 198
 199 /* Check that we see the correct platdata in each device */
 200 static int dm_test_platdata(struct dm_test_state *dms)
 201 {
 202         const struct dm_test_pdata *pdata;
 203         struct udevice *dev;
 204         int i;
 205
 206         for (i = 0; i < 3; i++) {
 207                 ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
 208                 ut_assert(dev);
 209                 pdata = dev->platdata;
 210                 ut_assert(pdata->ping_add == test_pdata[i].ping_add);
 211         }
 212
 213         return 0;
 214 }
 215 DM_TEST(dm_test_platdata, DM_TESTF_SCAN_PDATA);
 216
 217 /* Test that we can bind, probe, remove, unbind a driver */
 218 static int dm_test_lifecycle(struct dm_test_state *dms)
 219 {
 220         int op_count[DM_TEST_OP_COUNT];
 221         struct udevice *dev, *test_dev;
 222         int pingret;
 223         int ret;
 224
 225         memcpy(op_count, dm_testdrv_op_count, sizeof(op_count));
 226
 227         ut_assertok(device_bind_by_name(dms->root, false, &driver_info_manual,
 228                                         &dev));
 229         ut_assert(dev);
 230         ut_assert(dm_testdrv_op_count[DM_TEST_OP_BIND]
 231                         == op_count[DM_TEST_OP_BIND] + 1);
 232         ut_assert(!dev->priv);
 233
 234         /* Probe the device - it should fail allocating private data */
 235         dms->force_fail_alloc = 1;
 236         ret = device_probe(dev);
 237         ut_assert(ret == -ENOMEM);
 238         ut_assert(dm_testdrv_op_count[DM_TEST_OP_PROBE]
 239                         == op_count[DM_TEST_OP_PROBE] + 1);
 240         ut_assert(!dev->priv);
 241
 242         /* Try again without the alloc failure */
 243         dms->force_fail_alloc = 0;
 244         ut_assertok(device_probe(dev));
 245         ut_assert(dm_testdrv_op_count[DM_TEST_OP_PROBE]
 246                         == op_count[DM_TEST_OP_PROBE] + 2);
 247         ut_assert(dev->priv);
 248
 249         /* This should be device 3 in the uclass */
 250         ut_assertok(uclass_find_device(UCLASS_TEST, 3, &test_dev));
 251         ut_assert(dev == test_dev);
 252
 253         /* Try ping */
 254         ut_assertok(test_ping(dev, 100, &pingret));
 255         ut_assert(pingret == 102);
 256
 257         /* Now remove device 3 */
 258         ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_PRE_REMOVE]);
 259         ut_assertok(device_remove(dev));
 260         ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_PRE_REMOVE]);
 261
 262         ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
 263         ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_PRE_UNBIND]);
 264         ut_assertok(device_unbind(dev));
 265         ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
 266         ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_PRE_UNBIND]);
 267
 268         return 0;
 269 }
 270 DM_TEST(dm_test_lifecycle, DM_TESTF_SCAN_PDATA | DM_TESTF_PROBE_TEST);
 271
 272 /* Test that we can bind/unbind and the lists update correctly */
 273 static int dm_test_ordering(struct dm_test_state *dms)
 274 {
 275         struct udevice *dev, *dev_penultimate, *dev_last, *test_dev;
 276         int pingret;
 277
 278         ut_assertok(device_bind_by_name(dms->root, false, &driver_info_manual,
 279                                         &dev));
 280         ut_assert(dev);
 281
 282         /* Bind two new devices (numbers 4 and 5) */
 283         ut_assertok(device_bind_by_name(dms->root, false, &driver_info_manual,
 284                                         &dev_penultimate));
 285         ut_assert(dev_penultimate);
 286         ut_assertok(device_bind_by_name(dms->root, false, &driver_info_manual,
 287                                         &dev_last));
 288         ut_assert(dev_last);
 289
 290         /* Now remove device 3 */
 291         ut_assertok(device_remove(dev));
 292         ut_assertok(device_unbind(dev));
 293
 294         /* The device numbering should have shifted down one */
 295         ut_assertok(uclass_find_device(UCLASS_TEST, 3, &test_dev));
 296         ut_assert(dev_penultimate == test_dev);
 297         ut_assertok(uclass_find_device(UCLASS_TEST, 4, &test_dev));
 298         ut_assert(dev_last == test_dev);
 299
 300         /* Add back the original device 3, now in position 5 */
 301         ut_assertok(device_bind_by_name(dms->root, false, &driver_info_manual,
 302                                         &dev));
 303         ut_assert(dev);
 304
 305         /* Try ping */
 306         ut_assertok(test_ping(dev, 100, &pingret));
 307         ut_assert(pingret == 102);
 308
 309         /* Remove 3 and 4 */
 310         ut_assertok(device_remove(dev_penultimate));
 311         ut_assertok(device_unbind(dev_penultimate));
 312         ut_assertok(device_remove(dev_last));
 313         ut_assertok(device_unbind(dev_last));
 314
 315         /* Our device should now be in position 3 */
 316         ut_assertok(uclass_find_device(UCLASS_TEST, 3, &test_dev));
 317         ut_assert(dev == test_dev);
 318
 319         /* Now remove device 3 */
 320         ut_assertok(device_remove(dev));
 321         ut_assertok(device_unbind(dev));
 322
 323         return 0;
 324 }
 325 DM_TEST(dm_test_ordering, DM_TESTF_SCAN_PDATA);
 326
 327 /* Check that we can perform operations on a device (do a ping) */
 328 int dm_check_operations(struct dm_test_state *dms, struct udevice *dev,
 329                         uint32_t base, struct dm_test_priv *priv)
 330 {
 331         int expected;
 332         int pingret;
 333
 334         /* Getting the child device should allocate platdata / priv */
 335         ut_assertok(testfdt_ping(dev, 10, &pingret));
 336         ut_assert(dev->priv);
 337         ut_assert(dev->platdata);
 338
 339         expected = 10 + base;
 340         ut_asserteq(expected, pingret);
 341
 342         /* Do another ping */
 343         ut_assertok(testfdt_ping(dev, 20, &pingret));
 344         expected = 20 + base;
 345         ut_asserteq(expected, pingret);
 346
 347         /* Now check the ping_total */
 348         priv = dev->priv;
 349         ut_asserteq(DM_TEST_START_TOTAL + 10 + 20 + base * 2,
 350                     priv->ping_total);
 351
 352         return 0;
 353 }
 354
 355 /* Check that we can perform operations on devices */
 356 static int dm_test_operations(struct dm_test_state *dms)
 357 {
 358         struct udevice *dev;
 359         int i;
 360
 361         /*
 362          * Now check that the ping adds are what we expect. This is using the
 363          * ping-add property in each node.
 364          */
 365         for (i = 0; i < ARRAY_SIZE(test_pdata); i++) {
 366                 uint32_t base;
 367
 368                 ut_assertok(uclass_get_device(UCLASS_TEST, i, &dev));
 369
 370                 /*
 371                  * Get the 'reg' property, which tells us what the ping add
 372                  * should be. We don't use the platdata because we want
 373                  * to test the code that sets that up (testfdt_drv_probe()).
 374                  */
 375                 base = test_pdata[i].ping_add;
 376                 debug("dev=%d, base=%d\n", i, base);
 377
 378                 ut_assert(!dm_check_operations(dms, dev, base, dev->priv));
 379         }
 380
 381         return 0;
 382 }
 383 DM_TEST(dm_test_operations, DM_TESTF_SCAN_PDATA);
 384
 385 /* Remove all drivers and check that things work */
 386 static int dm_test_remove(struct dm_test_state *dms)
 387 {
 388         struct udevice *dev;
 389         int i;
 390
 391         for (i = 0; i < 3; i++) {
 392                 ut_assertok(uclass_find_device(UCLASS_TEST, i, &dev));
 393                 ut_assert(dev);
 394                 ut_assertf(dev->flags & DM_FLAG_ACTIVATED,
 395                            "Driver %d/%s not activated", i, dev->name);
 396                 ut_assertok(device_remove(dev));
 397                 ut_assertf(!(dev->flags & DM_FLAG_ACTIVATED),
 398                            "Driver %d/%s should have deactivated", i,
 399                            dev->name);
 400                 ut_assert(!dev->priv);
 401         }
 402
 403         return 0;
 404 }
 405 DM_TEST(dm_test_remove, DM_TESTF_SCAN_PDATA | DM_TESTF_PROBE_TEST);
 406
 407 /* Remove and recreate everything, check for memory leaks */
 408 static int dm_test_leak(struct dm_test_state *dms)
 409 {
 410         int i;
 411
 412         for (i = 0; i < 2; i++) {
 413                 struct udevice *dev;
 414                 int ret;
 415                 int id;
 416
 417                 dm_leak_check_start(dms);
 418
 419                 ut_assertok(dm_scan_platdata(false));
 420                 ut_assertok(dm_scan_fdt(gd->fdt_blob, false));
 421
 422                 /* Scanning the uclass is enough to probe all the devices */
 423                 for (id = UCLASS_ROOT; id < UCLASS_COUNT; id++) {
 424                         for (ret = uclass_first_device(UCLASS_TEST, &dev);
 425                              dev;
 426                              ret = uclass_next_device(&dev))
 427                                 ;
 428                         ut_assertok(ret);
 429                 }
 430
 431                 ut_assertok(dm_leak_check_end(dms));
 432         }
 433
 434         return 0;
 435 }
 436 DM_TEST(dm_test_leak, 0);
 437
 438 /* Test uclass init/destroy methods */
 439 static int dm_test_uclass(struct dm_test_state *dms)
 440 {
 441         struct uclass *uc;
 442
 443         ut_assertok(uclass_get(UCLASS_TEST, &uc));
 444         ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_INIT]);
 445         ut_asserteq(0, dm_testdrv_op_count[DM_TEST_OP_DESTROY]);
 446         ut_assert(uc->priv);
 447
 448         ut_assertok(uclass_destroy(uc));
 449         ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_INIT]);
 450         ut_asserteq(1, dm_testdrv_op_count[DM_TEST_OP_DESTROY]);
 451
 452         return 0;
 453 }
 454 DM_TEST(dm_test_uclass, 0);
 455
 456 /**
 457  * create_children() - Create children of a parent node
 458  *
 459  * @dms:        Test system state
 460  * @parent:     Parent device
 461  * @count:      Number of children to create
 462  * @key:        Key value to put in first child. Subsequence children
 463  *              receive an incrementing value
 464  * @child:      If not NULL, then the child device pointers are written into
 465  *              this array.
 466  * @return 0 if OK, -ve on error
 467  */
 468 static int create_children(struct dm_test_state *dms, struct udevice *parent,
 469                            int count, int key, struct udevice *child[])
 470 {
 471         struct udevice *dev;
 472         int i;
 473
 474         for (i = 0; i < count; i++) {
 475                 struct dm_test_pdata *pdata;
 476
 477                 ut_assertok(device_bind_by_name(parent, false,
 478                                                 &driver_info_manual, &dev));
 479                 pdata = calloc(1, sizeof(*pdata));
 480                 pdata->ping_add = key + i;
 481                 dev->platdata = pdata;
 482                 if (child)
 483                         child[i] = dev;
 484         }
 485
 486         return 0;
 487 }
 488
 489 #define NODE_COUNT      10
 490
 491 static int dm_test_children(struct dm_test_state *dms)
 492 {
 493         struct udevice *top[NODE_COUNT];
 494         struct udevice *child[NODE_COUNT];
 495         struct udevice *grandchild[NODE_COUNT];
 496         struct udevice *dev;
 497         int total;
 498         int ret;
 499         int i;
 500
 501         /* We don't care about the numbering for this test */
 502         dms->skip_post_probe = 1;
 503
 504         ut_assert(NODE_COUNT > 5);
 505
 506         /* First create 10 top-level children */
 507         ut_assertok(create_children(dms, dms->root, NODE_COUNT, 0, top));
 508
 509         /* Now a few have their own children */
 510         ut_assertok(create_children(dms, top[2], NODE_COUNT, 2, NULL));
 511         ut_assertok(create_children(dms, top[5], NODE_COUNT, 5, child));
 512
 513         /* And grandchildren */
 514         for (i = 0; i < NODE_COUNT; i++)
 515                 ut_assertok(create_children(dms, child[i], NODE_COUNT, 50 * i,
 516                                             i == 2 ? grandchild : NULL));
 517
 518         /* Check total number of devices */
 519         total = NODE_COUNT * (3 + NODE_COUNT);
 520         ut_asserteq(total, dm_testdrv_op_count[DM_TEST_OP_BIND]);
 521
 522         /* Try probing one of the grandchildren */
 523         ut_assertok(uclass_get_device(UCLASS_TEST,
 524                                       NODE_COUNT * 3 + 2 * NODE_COUNT, &dev));
 525         ut_asserteq_ptr(grandchild[0], dev);
 526
 527         /*
 528          * This should have probed the child and top node also, for a total
 529          * of 3 nodes.
 530          */
 531         ut_asserteq(3, dm_testdrv_op_count[DM_TEST_OP_PROBE]);
 532
 533         /* Probe the other grandchildren */
 534         for (i = 1; i < NODE_COUNT; i++)
 535                 ut_assertok(device_probe(grandchild[i]));
 536
 537         ut_asserteq(2 + NODE_COUNT, dm_testdrv_op_count[DM_TEST_OP_PROBE]);
 538
 539         /* Probe everything */
 540         for (ret = uclass_first_device(UCLASS_TEST, &dev);
 541              dev;
 542              ret = uclass_next_device(&dev))
 543                 ;
 544         ut_assertok(ret);
 545
 546         ut_asserteq(total, dm_testdrv_op_count[DM_TEST_OP_PROBE]);
 547
 548         /* Remove a top-level child and check that the children are removed */
 549         ut_assertok(device_remove(top[2]));
 550         ut_asserteq(NODE_COUNT + 1, dm_testdrv_op_count[DM_TEST_OP_REMOVE]);
 551         dm_testdrv_op_count[DM_TEST_OP_REMOVE] = 0;
 552
 553         /* Try one with grandchildren */
 554         ut_assertok(uclass_get_device(UCLASS_TEST, 5, &dev));
 555         ut_asserteq_ptr(dev, top[5]);
 556         ut_assertok(device_remove(dev));
 557         ut_asserteq(1 + NODE_COUNT * (1 + NODE_COUNT),
 558                     dm_testdrv_op_count[DM_TEST_OP_REMOVE]);
 559
 560         /* Try the same with unbind */
 561         ut_assertok(device_unbind(top[2]));
 562         ut_asserteq(NODE_COUNT + 1, dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
 563         dm_testdrv_op_count[DM_TEST_OP_UNBIND] = 0;
 564
 565         /* Try one with grandchildren */
 566         ut_assertok(uclass_get_device(UCLASS_TEST, 5, &dev));
 567         ut_asserteq_ptr(dev, top[6]);
 568         ut_assertok(device_unbind(top[5]));
 569         ut_asserteq(1 + NODE_COUNT * (1 + NODE_COUNT),
 570                     dm_testdrv_op_count[DM_TEST_OP_UNBIND]);
 571
 572         return 0;
 573 }
 574 DM_TEST(dm_test_children, 0);
 575
 576 /* Test that pre-relocation devices work as expected */
 577 static int dm_test_pre_reloc(struct dm_test_state *dms)
 578 {
 579         struct udevice *dev;
 580
 581         /* The normal driver should refuse to bind before relocation */
 582         ut_asserteq(-EPERM, device_bind_by_name(dms->root, true,
 583                                                 &driver_info_manual, &dev));
 584
 585         /* But this one is marked pre-reloc */
 586         ut_assertok(device_bind_by_name(dms->root, true,
 587                                         &driver_info_pre_reloc, &dev));
 588
 589         return 0;
 590 }
 591 DM_TEST(dm_test_pre_reloc, 0);
 592
 593 static int dm_test_uclass_before_ready(struct dm_test_state *dms)
 594 {
 595         struct uclass *uc;
 596
 597         ut_assertok(uclass_get(UCLASS_TEST, &uc));
 598
 599         memset(gd, '\0', sizeof(*gd));
 600         ut_asserteq_ptr(NULL, uclass_find(UCLASS_TEST));
 601
 602         return 0;
 603 }
 604
 605 DM_TEST(dm_test_uclass_before_ready, 0);
 606
 607 static int dm_test_device_get_uclass_id(struct dm_test_state *dms)
 608 {
 609         struct udevice *dev;
 610
 611         ut_assertok(uclass_get_device(UCLASS_TEST, 0, &dev));
 612         ut_asserteq(UCLASS_TEST, device_get_uclass_id(dev));
 613
 614         return 0;
 615 }
 616 DM_TEST(dm_test_device_get_uclass_id, DM_TESTF_SCAN_PDATA);