drivers/of/unittest.c

   1 /*
   2  * Self tests for device tree subsystem
   3  */
   4
   5 #define pr_fmt(fmt) "### dt-test ### " fmt
   6
   7 #include <linux/clk.h>
   8 #include <linux/err.h>
   9 #include <linux/errno.h>
  10 #include <linux/hashtable.h>
  11 #include <linux/of.h>
  12 #include <linux/of_fdt.h>
  13 #include <linux/of_irq.h>
  14 #include <linux/of_platform.h>
  15 #include <linux/list.h>
  16 #include <linux/mutex.h>
  17 #include <linux/slab.h>
  18 #include <linux/device.h>
  19 #include <linux/platform_device.h>
  20
  21 #include <linux/i2c.h>
  22 #include <linux/i2c-mux.h>
  23
  24 #include <linux/bitops.h>
  25
  26 #include "of_private.h"
  27
  28 static struct unittest_results {
  29         int passed;
  30         int failed;
  31 } unittest_results;
  32
  33 #define unittest(result, fmt, ...) ({ \
  34         bool failed = !(result); \
  35         if (failed) { \
  36                 unittest_results.failed++; \
  37                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  38         } else { \
  39                 unittest_results.passed++; \
  40                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  41         } \
  42         failed; \
  43 })
  44
  45 static void __init of_unittest_find_node_by_name(void)
  46 {
  47         struct device_node *np;
  48         const char *options;
  49
  50         np = of_find_node_by_path("/testcase-data");
  51         unittest(np && !strcmp("/testcase-data", np->full_name),
  52                 "find /testcase-data failed\n");
  53         of_node_put(np);
  54
  55         /* Test if trailing '/' works */
  56         np = of_find_node_by_path("/testcase-data/");
  57         unittest(!np, "trailing '/' on /testcase-data/ should fail\n");
  58
  59         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  60         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  61                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  62         of_node_put(np);
  63
  64         np = of_find_node_by_path("testcase-alias");
  65         unittest(np && !strcmp("/testcase-data", np->full_name),
  66                 "find testcase-alias failed\n");
  67         of_node_put(np);
  68
  69         /* Test if trailing '/' works on aliases */
  70         np = of_find_node_by_path("testcase-alias/");
  71         unittest(!np, "trailing '/' on testcase-alias/ should fail\n");
  72
  73         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  74         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  75                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  76         of_node_put(np);
  77
  78         np = of_find_node_by_path("/testcase-data/missing-path");
  79         unittest(!np, "non-existent path returned node %s\n", np->full_name);
  80         of_node_put(np);
  81
  82         np = of_find_node_by_path("missing-alias");
  83         unittest(!np, "non-existent alias returned node %s\n", np->full_name);
  84         of_node_put(np);
  85
  86         np = of_find_node_by_path("testcase-alias/missing-path");
  87         unittest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  88         of_node_put(np);
  89
  90         np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
  91         unittest(np && !strcmp("testoption", options),
  92                  "option path test failed\n");
  93         of_node_put(np);
  94
  95         np = of_find_node_opts_by_path("/testcase-data:test/option", &options);
  96         unittest(np && !strcmp("test/option", options),
  97                  "option path test, subcase #1 failed\n");
  98         of_node_put(np);
  99
 100         np = of_find_node_opts_by_path("/testcase-data/testcase-device1:test/option", &options);
 101         unittest(np && !strcmp("test/option", options),
 102                  "option path test, subcase #2 failed\n");
 103         of_node_put(np);
 104
 105         np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
 106         unittest(np, "NULL option path test failed\n");
 107         of_node_put(np);
 108
 109         np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
 110                                        &options);
 111         unittest(np && !strcmp("testaliasoption", options),
 112                  "option alias path test failed\n");
 113         of_node_put(np);
 114
 115         np = of_find_node_opts_by_path("testcase-alias:test/alias/option",
 116                                        &options);
 117         unittest(np && !strcmp("test/alias/option", options),
 118                  "option alias path test, subcase #1 failed\n");
 119         of_node_put(np);
 120
 121         np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
 122         unittest(np, "NULL option alias path test failed\n");
 123         of_node_put(np);
 124
 125         options = "testoption";
 126         np = of_find_node_opts_by_path("testcase-alias", &options);
 127         unittest(np && !options, "option clearing test failed\n");
 128         of_node_put(np);
 129
 130         options = "testoption";
 131         np = of_find_node_opts_by_path("/", &options);
 132         unittest(np && !options, "option clearing root node test failed\n");
 133         of_node_put(np);
 134 }
 135
 136 static void __init of_unittest_dynamic(void)
 137 {
 138         struct device_node *np;
 139         struct property *prop;
 140
 141         np = of_find_node_by_path("/testcase-data");
 142         if (!np) {
 143                 pr_err("missing testcase data\n");
 144                 return;
 145         }
 146
 147         /* Array of 4 properties for the purpose of testing */
 148         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
 149         if (!prop) {
 150                 unittest(0, "kzalloc() failed\n");
 151                 return;
 152         }
 153
 154         /* Add a new property - should pass*/
 155         prop->name = "new-property";
 156         prop->value = "new-property-data";
 157         prop->length = strlen(prop->value);
 158         unittest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 159
 160         /* Try to add an existing property - should fail */
 161         prop++;
 162         prop->name = "new-property";
 163         prop->value = "new-property-data-should-fail";
 164         prop->length = strlen(prop->value);
 165         unittest(of_add_property(np, prop) != 0,
 166                  "Adding an existing property should have failed\n");
 167
 168         /* Try to modify an existing property - should pass */
 169         prop->value = "modify-property-data-should-pass";
 170         prop->length = strlen(prop->value);
 171         unittest(of_update_property(np, prop) == 0,
 172                  "Updating an existing property should have passed\n");
 173
 174         /* Try to modify non-existent property - should pass*/
 175         prop++;
 176         prop->name = "modify-property";
 177         prop->value = "modify-missing-property-data-should-pass";
 178         prop->length = strlen(prop->value);
 179         unittest(of_update_property(np, prop) == 0,
 180                  "Updating a missing property should have passed\n");
 181
 182         /* Remove property - should pass */
 183         unittest(of_remove_property(np, prop) == 0,
 184                  "Removing a property should have passed\n");
 185
 186         /* Adding very large property - should pass */
 187         prop++;
 188         prop->name = "large-property-PAGE_SIZEx8";
 189         prop->length = PAGE_SIZE * 8;
 190         prop->value = kzalloc(prop->length, GFP_KERNEL);
 191         unittest(prop->value != NULL, "Unable to allocate large buffer\n");
 192         if (prop->value)
 193                 unittest(of_add_property(np, prop) == 0,
 194                          "Adding a large property should have passed\n");
 195 }
 196
 197 static int __init of_unittest_check_node_linkage(struct device_node *np)
 198 {
 199         struct device_node *child;
 200         int count = 0, rc;
 201
 202         for_each_child_of_node(np, child) {
 203                 if (child->parent != np) {
 204                         pr_err("Child node %s links to wrong parent %s\n",
 205                                  child->name, np->name);
 206                         rc = -EINVAL;
 207                         goto put_child;
 208                 }
 209
 210                 rc = of_unittest_check_node_linkage(child);
 211                 if (rc < 0)
 212                         goto put_child;
 213                 count += rc;
 214         }
 215
 216         return count + 1;
 217 put_child:
 218         of_node_put(child);
 219         return rc;
 220 }
 221
 222 static void __init of_unittest_check_tree_linkage(void)
 223 {
 224         struct device_node *np;
 225         int allnode_count = 0, child_count;
 226
 227         if (!of_root)
 228                 return;
 229
 230         for_each_of_allnodes(np)
 231                 allnode_count++;
 232         child_count = of_unittest_check_node_linkage(of_root);
 233
 234         unittest(child_count > 0, "Device node data structure is corrupted\n");
 235         unittest(child_count == allnode_count,
 236                  "allnodes list size (%i) doesn't match sibling lists size (%i)\n",
 237                  allnode_count, child_count);
 238         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 239 }
 240
 241 struct node_hash {
 242         struct hlist_node node;
 243         struct device_node *np;
 244 };
 245
 246 static DEFINE_HASHTABLE(phandle_ht, 8);
 247 static void __init of_unittest_check_phandles(void)
 248 {
 249         struct device_node *np;
 250         struct node_hash *nh;
 251         struct hlist_node *tmp;
 252         int i, dup_count = 0, phandle_count = 0;
 253
 254         for_each_of_allnodes(np) {
 255                 if (!np->phandle)
 256                         continue;
 257
 258                 hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
 259                         if (nh->np->phandle == np->phandle) {
 260                                 pr_info("Duplicate phandle! %i used by %s and %s\n",
 261                                         np->phandle, nh->np->full_name, np->full_name);
 262                                 dup_count++;
 263                                 break;
 264                         }
 265                 }
 266
 267                 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 268                 if (WARN_ON(!nh))
 269                         return;
 270
 271                 nh->np = np;
 272                 hash_add(phandle_ht, &nh->node, np->phandle);
 273                 phandle_count++;
 274         }
 275         unittest(dup_count == 0, "Found %i duplicates in %i phandles\n",
 276                  dup_count, phandle_count);
 277
 278         /* Clean up */
 279         hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
 280                 hash_del(&nh->node);
 281                 kfree(nh);
 282         }
 283 }
 284
 285 static void __init of_unittest_parse_phandle_with_args(void)
 286 {
 287         struct device_node *np;
 288         struct of_phandle_args args;
 289         int i, rc;
 290
 291         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 292         if (!np) {
 293                 pr_err("missing testcase data\n");
 294                 return;
 295         }
 296
 297         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 298         unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 299
 300         for (i = 0; i < 8; i++) {
 301                 bool passed = true;
 302
 303                 rc = of_parse_phandle_with_args(np, "phandle-list",
 304                                                 "#phandle-cells", i, &args);
 305
 306                 /* Test the values from tests-phandle.dtsi */
 307                 switch (i) {
 308                 case 0:
 309                         passed &= !rc;
 310                         passed &= (args.args_count == 1);
 311                         passed &= (args.args[0] == (i + 1));
 312                         break;
 313                 case 1:
 314                         passed &= !rc;
 315                         passed &= (args.args_count == 2);
 316                         passed &= (args.args[0] == (i + 1));
 317                         passed &= (args.args[1] == 0);
 318                         break;
 319                 case 2:
 320                         passed &= (rc == -ENOENT);
 321                         break;
 322                 case 3:
 323                         passed &= !rc;
 324                         passed &= (args.args_count == 3);
 325                         passed &= (args.args[0] == (i + 1));
 326                         passed &= (args.args[1] == 4);
 327                         passed &= (args.args[2] == 3);
 328                         break;
 329                 case 4:
 330                         passed &= !rc;
 331                         passed &= (args.args_count == 2);
 332                         passed &= (args.args[0] == (i + 1));
 333                         passed &= (args.args[1] == 100);
 334                         break;
 335                 case 5:
 336                         passed &= !rc;
 337                         passed &= (args.args_count == 0);
 338                         break;
 339                 case 6:
 340                         passed &= !rc;
 341                         passed &= (args.args_count == 1);
 342                         passed &= (args.args[0] == (i + 1));
 343                         break;
 344                 case 7:
 345                         passed &= (rc == -ENOENT);
 346                         break;
 347                 default:
 348                         passed = false;
 349                 }
 350
 351                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 352                          i, args.np->full_name, rc);
 353         }
 354
 355         /* Check for missing list property */
 356         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 357                                         "#phandle-cells", 0, &args);
 358         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 359         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 360                                         "#phandle-cells");
 361         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 362
 363         /* Check for missing cells property */
 364         rc = of_parse_phandle_with_args(np, "phandle-list",
 365                                         "#phandle-cells-missing", 0, &args);
 366         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 367         rc = of_count_phandle_with_args(np, "phandle-list",
 368                                         "#phandle-cells-missing");
 369         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 370
 371         /* Check for bad phandle in list */
 372         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 373                                         "#phandle-cells", 0, &args);
 374         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 375         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 376                                         "#phandle-cells");
 377         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 378
 379         /* Check for incorrectly formed argument list */
 380         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 381                                         "#phandle-cells", 1, &args);
 382         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 383         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 384                                         "#phandle-cells");
 385         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 386 }
 387
 388 static void __init of_unittest_property_string(void)
 389 {
 390         const char *strings[4];
 391         struct device_node *np;
 392         int rc;
 393
 394         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 395         if (!np) {
 396                 pr_err("No testcase data in device tree\n");
 397                 return;
 398         }
 399
 400         rc = of_property_match_string(np, "phandle-list-names", "first");
 401         unittest(rc == 0, "first expected:0 got:%i\n", rc);
 402         rc = of_property_match_string(np, "phandle-list-names", "second");
 403         unittest(rc == 1, "second expected:1 got:%i\n", rc);
 404         rc = of_property_match_string(np, "phandle-list-names", "third");
 405         unittest(rc == 2, "third expected:2 got:%i\n", rc);
 406         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 407         unittest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
 408         rc = of_property_match_string(np, "missing-property", "blah");
 409         unittest(rc == -EINVAL, "missing property; rc=%i\n", rc);
 410         rc = of_property_match_string(np, "empty-property", "blah");
 411         unittest(rc == -ENODATA, "empty property; rc=%i\n", rc);
 412         rc = of_property_match_string(np, "unterminated-string", "blah");
 413         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 414
 415         /* of_property_count_strings() tests */
 416         rc = of_property_count_strings(np, "string-property");
 417         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 418         rc = of_property_count_strings(np, "phandle-list-names");
 419         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 420         rc = of_property_count_strings(np, "unterminated-string");
 421         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 422         rc = of_property_count_strings(np, "unterminated-string-list");
 423         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 424
 425         /* of_property_read_string_index() tests */
 426         rc = of_property_read_string_index(np, "string-property", 0, strings);
 427         unittest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
 428         strings[0] = NULL;
 429         rc = of_property_read_string_index(np, "string-property", 1, strings);
 430         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 431         rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
 432         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 433         rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
 434         unittest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
 435         rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
 436         unittest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
 437         strings[0] = NULL;
 438         rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
 439         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 440         strings[0] = NULL;
 441         rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
 442         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 443         rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
 444         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 445         strings[0] = NULL;
 446         rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
 447         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 448         strings[1] = NULL;
 449
 450         /* of_property_read_string_array() tests */
 451         rc = of_property_read_string_array(np, "string-property", strings, 4);
 452         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 453         rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
 454         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 455         rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
 456         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 457         /* -- An incorrectly formed string should cause a failure */
 458         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
 459         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 460         /* -- parsing the correctly formed strings should still work: */
 461         strings[2] = NULL;
 462         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
 463         unittest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
 464         strings[1] = NULL;
 465         rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
 466         unittest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
 467 }
 468
 469 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 470                         (p1)->value && (p2)->value && \
 471                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 472                         !strcmp((p1)->name, (p2)->name))
 473 static void __init of_unittest_property_copy(void)
 474 {
 475 #ifdef CONFIG_OF_DYNAMIC
 476         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 477         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 478         struct property *new;
 479
 480         new = __of_prop_dup(&p1, GFP_KERNEL);
 481         unittest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 482         kfree(new->value);
 483         kfree(new->name);
 484         kfree(new);
 485
 486         new = __of_prop_dup(&p2, GFP_KERNEL);
 487         unittest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 488         kfree(new->value);
 489         kfree(new->name);
 490         kfree(new);
 491 #endif
 492 }
 493
 494 static void __init of_unittest_changeset(void)
 495 {
 496 #ifdef CONFIG_OF_DYNAMIC
 497         struct property *ppadd, padd = { .name = "prop-add", .length = 0, .value = "" };
 498         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 499         struct property *ppremove;
 500         struct device_node *n1, *n2, *n21, *nremove, *parent, *np;
 501         struct of_changeset chgset;
 502
 503         n1 = __of_node_dup(NULL, "/testcase-data/changeset/n1");
 504         unittest(n1, "testcase setup failure\n");
 505         n2 = __of_node_dup(NULL, "/testcase-data/changeset/n2");
 506         unittest(n2, "testcase setup failure\n");
 507         n21 = __of_node_dup(NULL, "%s/%s", "/testcase-data/changeset/n2", "n21");
 508         unittest(n21, "testcase setup failure %p\n", n21);
 509         nremove = of_find_node_by_path("/testcase-data/changeset/node-remove");
 510         unittest(nremove, "testcase setup failure\n");
 511         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 512         unittest(ppadd, "testcase setup failure\n");
 513         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 514         unittest(ppupdate, "testcase setup failure\n");
 515         parent = nremove->parent;
 516         n1->parent = parent;
 517         n2->parent = parent;
 518         n21->parent = n2;
 519         n2->child = n21;
 520         ppremove = of_find_property(parent, "prop-remove", NULL);
 521         unittest(ppremove, "failed to find removal prop");
 522
 523         of_changeset_init(&chgset);
 524         unittest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 525         unittest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 526         unittest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 527         unittest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 528         unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
 529         unittest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 530         unittest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 531         unittest(!of_changeset_apply(&chgset), "apply failed\n");
 532
 533         /* Make sure node names are constructed correctly */
 534         unittest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
 535                  "'%s' not added\n", n21->full_name);
 536         of_node_put(np);
 537
 538         unittest(!of_changeset_revert(&chgset), "revert failed\n");
 539
 540         of_changeset_destroy(&chgset);
 541 #endif
 542 }
 543
 544 static void __init of_unittest_parse_interrupts(void)
 545 {
 546         struct device_node *np;
 547         struct of_phandle_args args;
 548         int i, rc;
 549
 550         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 551         if (!np) {
 552                 pr_err("missing testcase data\n");
 553                 return;
 554         }
 555
 556         for (i = 0; i < 4; i++) {
 557                 bool passed = true;
 558
 559                 args.args_count = 0;
 560                 rc = of_irq_parse_one(np, i, &args);
 561
 562                 passed &= !rc;
 563                 passed &= (args.args_count == 1);
 564                 passed &= (args.args[0] == (i + 1));
 565
 566                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 567                          i, args.np->full_name, rc);
 568         }
 569         of_node_put(np);
 570
 571         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 572         if (!np) {
 573                 pr_err("missing testcase data\n");
 574                 return;
 575         }
 576
 577         for (i = 0; i < 4; i++) {
 578                 bool passed = true;
 579
 580                 args.args_count = 0;
 581                 rc = of_irq_parse_one(np, i, &args);
 582
 583                 /* Test the values from tests-phandle.dtsi */
 584                 switch (i) {
 585                 case 0:
 586                         passed &= !rc;
 587                         passed &= (args.args_count == 1);
 588                         passed &= (args.args[0] == 9);
 589                         break;
 590                 case 1:
 591                         passed &= !rc;
 592                         passed &= (args.args_count == 3);
 593                         passed &= (args.args[0] == 10);
 594                         passed &= (args.args[1] == 11);
 595                         passed &= (args.args[2] == 12);
 596                         break;
 597                 case 2:
 598                         passed &= !rc;
 599                         passed &= (args.args_count == 2);
 600                         passed &= (args.args[0] == 13);
 601                         passed &= (args.args[1] == 14);
 602                         break;
 603                 case 3:
 604                         passed &= !rc;
 605                         passed &= (args.args_count == 2);
 606                         passed &= (args.args[0] == 15);
 607                         passed &= (args.args[1] == 16);
 608                         break;
 609                 default:
 610                         passed = false;
 611                 }
 612                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 613                          i, args.np->full_name, rc);
 614         }
 615         of_node_put(np);
 616 }
 617
 618 static void __init of_unittest_parse_interrupts_extended(void)
 619 {
 620         struct device_node *np;
 621         struct of_phandle_args args;
 622         int i, rc;
 623
 624         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 625         if (!np) {
 626                 pr_err("missing testcase data\n");
 627                 return;
 628         }
 629
 630         for (i = 0; i < 7; i++) {
 631                 bool passed = true;
 632
 633                 rc = of_irq_parse_one(np, i, &args);
 634
 635                 /* Test the values from tests-phandle.dtsi */
 636                 switch (i) {
 637                 case 0:
 638                         passed &= !rc;
 639                         passed &= (args.args_count == 1);
 640                         passed &= (args.args[0] == 1);
 641                         break;
 642                 case 1:
 643                         passed &= !rc;
 644                         passed &= (args.args_count == 3);
 645                         passed &= (args.args[0] == 2);
 646                         passed &= (args.args[1] == 3);
 647                         passed &= (args.args[2] == 4);
 648                         break;
 649                 case 2:
 650                         passed &= !rc;
 651                         passed &= (args.args_count == 2);
 652                         passed &= (args.args[0] == 5);
 653                         passed &= (args.args[1] == 6);
 654                         break;
 655                 case 3:
 656                         passed &= !rc;
 657                         passed &= (args.args_count == 1);
 658                         passed &= (args.args[0] == 9);
 659                         break;
 660                 case 4:
 661                         passed &= !rc;
 662                         passed &= (args.args_count == 3);
 663                         passed &= (args.args[0] == 10);
 664                         passed &= (args.args[1] == 11);
 665                         passed &= (args.args[2] == 12);
 666                         break;
 667                 case 5:
 668                         passed &= !rc;
 669                         passed &= (args.args_count == 2);
 670                         passed &= (args.args[0] == 13);
 671                         passed &= (args.args[1] == 14);
 672                         break;
 673                 case 6:
 674                         passed &= !rc;
 675                         passed &= (args.args_count == 1);
 676                         passed &= (args.args[0] == 15);
 677                         break;
 678                 default:
 679                         passed = false;
 680                 }
 681
 682                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 683                          i, args.np->full_name, rc);
 684         }
 685         of_node_put(np);
 686 }
 687
 688 static const struct of_device_id match_node_table[] = {
 689         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 690         { .data = "B", .type = "type1", }, /* followed by type alone */
 691
 692         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 693         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 694         { .data = "Cc", .name = "name2", .type = "type2", },
 695
 696         { .data = "E", .compatible = "compat3" },
 697         { .data = "G", .compatible = "compat2", },
 698         { .data = "H", .compatible = "compat2", .name = "name5", },
 699         { .data = "I", .compatible = "compat2", .type = "type1", },
 700         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 701         { .data = "K", .compatible = "compat2", .name = "name9", },
 702         {}
 703 };
 704
 705 static struct {
 706         const char *path;
 707         const char *data;
 708 } match_node_tests[] = {
 709         { .path = "/testcase-data/match-node/name0", .data = "A", },
 710         { .path = "/testcase-data/match-node/name1", .data = "B", },
 711         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 712         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 713         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 714         { .path = "/testcase-data/match-node/name3", .data = "E", },
 715         { .path = "/testcase-data/match-node/name4", .data = "G", },
 716         { .path = "/testcase-data/match-node/name5", .data = "H", },
 717         { .path = "/testcase-data/match-node/name6", .data = "G", },
 718         { .path = "/testcase-data/match-node/name7", .data = "I", },
 719         { .path = "/testcase-data/match-node/name8", .data = "J", },
 720         { .path = "/testcase-data/match-node/name9", .data = "K", },
 721 };
 722
 723 static void __init of_unittest_match_node(void)
 724 {
 725         struct device_node *np;
 726         const struct of_device_id *match;
 727         int i;
 728
 729         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 730                 np = of_find_node_by_path(match_node_tests[i].path);
 731                 if (!np) {
 732                         unittest(0, "missing testcase node %s\n",
 733                                 match_node_tests[i].path);
 734                         continue;
 735                 }
 736
 737                 match = of_match_node(match_node_table, np);
 738                 if (!match) {
 739                         unittest(0, "%s didn't match anything\n",
 740                                 match_node_tests[i].path);
 741                         continue;
 742                 }
 743
 744                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 745                         unittest(0, "%s got wrong match. expected %s, got %s\n",
 746                                 match_node_tests[i].path, match_node_tests[i].data,
 747                                 (const char *)match->data);
 748                         continue;
 749                 }
 750                 unittest(1, "passed");
 751         }
 752 }
 753
 754 static struct resource test_bus_res = {
 755         .start = 0xfffffff8,
 756         .end = 0xfffffff9,
 757         .flags = IORESOURCE_MEM,
 758 };
 759 static const struct platform_device_info test_bus_info = {
 760         .name = "unittest-bus",
 761 };
 762 static void __init of_unittest_platform_populate(void)
 763 {
 764         int irq, rc;
 765         struct device_node *np, *child, *grandchild;
 766         struct platform_device *pdev, *test_bus;
 767         const struct of_device_id match[] = {
 768                 { .compatible = "test-device", },
 769                 {}
 770         };
 771
 772         np = of_find_node_by_path("/testcase-data");
 773         of_platform_default_populate(np, NULL, NULL);
 774
 775         /* Test that a missing irq domain returns -EPROBE_DEFER */
 776         np = of_find_node_by_path("/testcase-data/testcase-device1");
 777         pdev = of_find_device_by_node(np);
 778         unittest(pdev, "device 1 creation failed\n");
 779
 780         irq = platform_get_irq(pdev, 0);
 781         unittest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 782
 783         /* Test that a parsing failure does not return -EPROBE_DEFER */
 784         np = of_find_node_by_path("/testcase-data/testcase-device2");
 785         pdev = of_find_device_by_node(np);
 786         unittest(pdev, "device 2 creation failed\n");
 787         irq = platform_get_irq(pdev, 0);
 788         unittest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 789
 790         np = of_find_node_by_path("/testcase-data/platform-tests");
 791         unittest(np, "No testcase data in device tree\n");
 792         if (!np)
 793                 return;
 794
 795         test_bus = platform_device_register_full(&test_bus_info);
 796         rc = PTR_ERR_OR_ZERO(test_bus);
 797         unittest(!rc, "testbus registration failed; rc=%i\n", rc);
 798         if (rc)
 799                 return;
 800         test_bus->dev.of_node = np;
 801
 802         /*
 803          * Add a dummy resource to the test bus node after it is
 804          * registered to catch problems with un-inserted resources. The
 805          * DT code doesn't insert the resources, and it has caused the
 806          * kernel to oops in the past. This makes sure the same bug
 807          * doesn't crop up again.
 808          */
 809         platform_device_add_resources(test_bus, &test_bus_res, 1);
 810
 811         of_platform_populate(np, match, NULL, &test_bus->dev);
 812         for_each_child_of_node(np, child) {
 813                 for_each_child_of_node(child, grandchild)
 814                         unittest(of_find_device_by_node(grandchild),
 815                                  "Could not create device for node '%s'\n",
 816                                  grandchild->name);
 817         }
 818
 819         of_platform_depopulate(&test_bus->dev);
 820         for_each_child_of_node(np, child) {
 821                 for_each_child_of_node(child, grandchild)
 822                         unittest(!of_find_device_by_node(grandchild),
 823                                  "device didn't get destroyed '%s'\n",
 824                                  grandchild->name);
 825         }
 826
 827         platform_device_unregister(test_bus);
 828         of_node_put(np);
 829 }
 830
 831 /**
 832  *      update_node_properties - adds the properties
 833  *      of np into dup node (present in live tree) and
 834  *      updates parent of children of np to dup.
 835  *
 836  *      @np:    node already present in live tree
 837  *      @dup:   node present in live tree to be updated
 838  */
 839 static void update_node_properties(struct device_node *np,
 840                                         struct device_node *dup)
 841 {
 842         struct property *prop;
 843         struct device_node *child;
 844
 845         for_each_property_of_node(np, prop)
 846                 of_add_property(dup, prop);
 847
 848         for_each_child_of_node(np, child)
 849                 child->parent = dup;
 850 }
 851
 852 /**
 853  *      attach_node_and_children - attaches nodes
 854  *      and its children to live tree
 855  *
 856  *      @np:    Node to attach to live tree
 857  */
 858 static int attach_node_and_children(struct device_node *np)
 859 {
 860         struct device_node *next, *dup, *child;
 861         unsigned long flags;
 862
 863         dup = of_find_node_by_path(np->full_name);
 864         if (dup) {
 865                 update_node_properties(np, dup);
 866                 return 0;
 867         }
 868
 869         child = np->child;
 870         np->child = NULL;
 871
 872         mutex_lock(&of_mutex);
 873         raw_spin_lock_irqsave(&devtree_lock, flags);
 874         np->sibling = np->parent->child;
 875         np->parent->child = np;
 876         of_node_clear_flag(np, OF_DETACHED);
 877         raw_spin_unlock_irqrestore(&devtree_lock, flags);
 878
 879         __of_attach_node_sysfs(np);
 880         mutex_unlock(&of_mutex);
 881
 882         while (child) {
 883                 next = child->sibling;
 884                 attach_node_and_children(child);
 885                 child = next;
 886         }
 887
 888         return 0;
 889 }
 890
 891 /**
 892  *      unittest_data_add - Reads, copies data from
 893  *      linked tree and attaches it to the live tree
 894  */
 895 static int __init unittest_data_add(void)
 896 {
 897         void *unittest_data;
 898         struct device_node *unittest_data_node, *np;
 899         /*
 900          * __dtb_testcases_begin[] and __dtb_testcases_end[] are magically
 901          * created by cmd_dt_S_dtb in scripts/Makefile.lib
 902          */
 903         extern uint8_t __dtb_testcases_begin[];
 904         extern uint8_t __dtb_testcases_end[];
 905         const int size = __dtb_testcases_end - __dtb_testcases_begin;
 906         int rc;
 907
 908         if (!size) {
 909                 pr_warn("%s: No testcase data to attach; not running tests\n",
 910                         __func__);
 911                 return -ENODATA;
 912         }
 913
 914         /* creating copy */
 915         unittest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
 916
 917         if (!unittest_data) {
 918                 pr_warn("%s: Failed to allocate memory for unittest_data; "
 919                         "not running tests\n", __func__);
 920                 return -ENOMEM;
 921         }
 922         of_fdt_unflatten_tree(unittest_data, NULL, &unittest_data_node);
 923         if (!unittest_data_node) {
 924                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
 925                 return -ENODATA;
 926         }
 927         of_node_set_flag(unittest_data_node, OF_DETACHED);
 928         rc = of_resolve_phandles(unittest_data_node);
 929         if (rc) {
 930                 pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
 931                 return -EINVAL;
 932         }
 933
 934         if (!of_root) {
 935                 of_root = unittest_data_node;
 936                 for_each_of_allnodes(np)
 937                         __of_attach_node_sysfs(np);
 938                 of_aliases = of_find_node_by_path("/aliases");
 939                 of_chosen = of_find_node_by_path("/chosen");
 940                 return 0;
 941         }
 942
 943         /* attach the sub-tree to live tree */
 944         np = unittest_data_node->child;
 945         while (np) {
 946                 struct device_node *next = np->sibling;
 947
 948                 np->parent = of_root;
 949                 attach_node_and_children(np);
 950                 np = next;
 951         }
 952         return 0;
 953 }
 954
 955 #ifdef CONFIG_OF_OVERLAY
 956
 957 static int unittest_probe(struct platform_device *pdev)
 958 {
 959         struct device *dev = &pdev->dev;
 960         struct device_node *np = dev->of_node;
 961
 962         if (np == NULL) {
 963                 dev_err(dev, "No OF data for device\n");
 964                 return -EINVAL;
 965
 966         }
 967
 968         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 969
 970         of_platform_populate(np, NULL, NULL, &pdev->dev);
 971
 972         return 0;
 973 }
 974
 975 static int unittest_remove(struct platform_device *pdev)
 976 {
 977         struct device *dev = &pdev->dev;
 978         struct device_node *np = dev->of_node;
 979
 980         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 981         return 0;
 982 }
 983
 984 static const struct of_device_id unittest_match[] = {
 985         { .compatible = "unittest", },
 986         {},
 987 };
 988
 989 static struct platform_driver unittest_driver = {
 990         .probe                  = unittest_probe,
 991         .remove                 = unittest_remove,
 992         .driver = {
 993                 .name           = "unittest",
 994                 .of_match_table = of_match_ptr(unittest_match),
 995         },
 996 };
 997
 998 /* get the platform device instantiated at the path */
 999 static struct platform_device *of_path_to_platform_device(const char *path)
1000 {
1001         struct device_node *np;
1002         struct platform_device *pdev;
1003
1004         np = of_find_node_by_path(path);
1005         if (np == NULL)
1006                 return NULL;
1007
1008         pdev = of_find_device_by_node(np);
1009         of_node_put(np);
1010
1011         return pdev;
1012 }
1013
1014 /* find out if a platform device exists at that path */
1015 static int of_path_platform_device_exists(const char *path)
1016 {
1017         struct platform_device *pdev;
1018
1019         pdev = of_path_to_platform_device(path);
1020         platform_device_put(pdev);
1021         return pdev != NULL;
1022 }
1023
1024 #if IS_BUILTIN(CONFIG_I2C)
1025
1026 /* get the i2c client device instantiated at the path */
1027 static struct i2c_client *of_path_to_i2c_client(const char *path)
1028 {
1029         struct device_node *np;
1030         struct i2c_client *client;
1031
1032         np = of_find_node_by_path(path);
1033         if (np == NULL)
1034                 return NULL;
1035
1036         client = of_find_i2c_device_by_node(np);
1037         of_node_put(np);
1038
1039         return client;
1040 }
1041
1042 /* find out if a i2c client device exists at that path */
1043 static int of_path_i2c_client_exists(const char *path)
1044 {
1045         struct i2c_client *client;
1046
1047         client = of_path_to_i2c_client(path);
1048         if (client)
1049                 put_device(&client->dev);
1050         return client != NULL;
1051 }
1052 #else
1053 static int of_path_i2c_client_exists(const char *path)
1054 {
1055         return 0;
1056 }
1057 #endif
1058
1059 enum overlay_type {
1060         PDEV_OVERLAY,
1061         I2C_OVERLAY
1062 };
1063
1064 static int of_path_device_type_exists(const char *path,
1065                 enum overlay_type ovtype)
1066 {
1067         switch (ovtype) {
1068         case PDEV_OVERLAY:
1069                 return of_path_platform_device_exists(path);
1070         case I2C_OVERLAY:
1071                 return of_path_i2c_client_exists(path);
1072         }
1073         return 0;
1074 }
1075
1076 static const char *unittest_path(int nr, enum overlay_type ovtype)
1077 {
1078         const char *base;
1079         static char buf[256];
1080
1081         switch (ovtype) {
1082         case PDEV_OVERLAY:
1083                 base = "/testcase-data/overlay-node/test-bus";
1084                 break;
1085         case I2C_OVERLAY:
1086                 base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
1087                 break;
1088         default:
1089                 buf[0] = '\0';
1090                 return buf;
1091         }
1092         snprintf(buf, sizeof(buf) - 1, "%s/test-unittest%d", base, nr);
1093         buf[sizeof(buf) - 1] = '\0';
1094         return buf;
1095 }
1096
1097 static int of_unittest_device_exists(int unittest_nr, enum overlay_type ovtype)
1098 {
1099         const char *path;
1100
1101         path = unittest_path(unittest_nr, ovtype);
1102
1103         switch (ovtype) {
1104         case PDEV_OVERLAY:
1105                 return of_path_platform_device_exists(path);
1106         case I2C_OVERLAY:
1107                 return of_path_i2c_client_exists(path);
1108         }
1109         return 0;
1110 }
1111
1112 static const char *overlay_path(int nr)
1113 {
1114         static char buf[256];
1115
1116         snprintf(buf, sizeof(buf) - 1,
1117                 "/testcase-data/overlay%d", nr);
1118         buf[sizeof(buf) - 1] = '\0';
1119
1120         return buf;
1121 }
1122
1123 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
1124
1125 /* it is guaranteed that overlay ids are assigned in sequence */
1126 #define MAX_UNITTEST_OVERLAYS   256
1127 static unsigned long overlay_id_bits[BITS_TO_LONGS(MAX_UNITTEST_OVERLAYS)];
1128 static int overlay_first_id = -1;
1129
1130 static void of_unittest_track_overlay(int id)
1131 {
1132         if (overlay_first_id < 0)
1133                 overlay_first_id = id;
1134         id -= overlay_first_id;
1135
1136         /* we shouldn't need that many */
1137         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1138         overlay_id_bits[BIT_WORD(id)] |= BIT_MASK(id);
1139 }
1140
1141 static void of_unittest_untrack_overlay(int id)
1142 {
1143         if (overlay_first_id < 0)
1144                 return;
1145         id -= overlay_first_id;
1146         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1147         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1148 }
1149
1150 static void of_unittest_destroy_tracked_overlays(void)
1151 {
1152         int id, ret, defers;
1153
1154         if (overlay_first_id < 0)
1155                 return;
1156
1157         /* try until no defers */
1158         do {
1159                 defers = 0;
1160                 /* remove in reverse order */
1161                 for (id = MAX_UNITTEST_OVERLAYS - 1; id >= 0; id--) {
1162                         if (!(overlay_id_bits[BIT_WORD(id)] & BIT_MASK(id)))
1163                                 continue;
1164
1165                         ret = of_overlay_destroy(id + overlay_first_id);
1166                         if (ret == -ENODEV) {
1167                                 pr_warn("%s: no overlay to destroy for #%d\n",
1168                                         __func__, id + overlay_first_id);
1169                                 continue;
1170                         }
1171                         if (ret != 0) {
1172                                 defers++;
1173                                 pr_warn("%s: overlay destroy failed for #%d\n",
1174                                         __func__, id + overlay_first_id);
1175                                 continue;
1176                         }
1177
1178                         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1179                 }
1180         } while (defers > 0);
1181 }
1182
1183 static int of_unittest_apply_overlay(int overlay_nr, int unittest_nr,
1184                 int *overlay_id)
1185 {
1186         struct device_node *np = NULL;
1187         int ret, id = -1;
1188
1189         np = of_find_node_by_path(overlay_path(overlay_nr));
1190         if (np == NULL) {
1191                 unittest(0, "could not find overlay node @\"%s\"\n",
1192                                 overlay_path(overlay_nr));
1193                 ret = -EINVAL;
1194                 goto out;
1195         }
1196
1197         ret = of_overlay_create(np);
1198         if (ret < 0) {
1199                 unittest(0, "could not create overlay from \"%s\"\n",
1200                                 overlay_path(overlay_nr));
1201                 goto out;
1202         }
1203         id = ret;
1204         of_unittest_track_overlay(id);
1205
1206         ret = 0;
1207
1208 out:
1209         of_node_put(np);
1210
1211         if (overlay_id)
1212                 *overlay_id = id;
1213
1214         return ret;
1215 }
1216
1217 /* apply an overlay while checking before and after states */
1218 static int of_unittest_apply_overlay_check(int overlay_nr, int unittest_nr,
1219                 int before, int after, enum overlay_type ovtype)
1220 {
1221         int ret;
1222
1223         /* unittest device must not be in before state */
1224         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1225                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1226                                 overlay_path(overlay_nr),
1227                                 unittest_path(unittest_nr, ovtype),
1228                                 !before ? "enabled" : "disabled");
1229                 return -EINVAL;
1230         }
1231
1232         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, NULL);
1233         if (ret != 0) {
1234                 /* of_unittest_apply_overlay already called unittest() */
1235                 return ret;
1236         }
1237
1238         /* unittest device must be to set to after state */
1239         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1240                 unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1241                                 overlay_path(overlay_nr),
1242                                 unittest_path(unittest_nr, ovtype),
1243                                 !after ? "enabled" : "disabled");
1244                 return -EINVAL;
1245         }
1246
1247         return 0;
1248 }
1249
1250 /* apply an overlay and then revert it while checking before, after states */
1251 static int of_unittest_apply_revert_overlay_check(int overlay_nr,
1252                 int unittest_nr, int before, int after,
1253                 enum overlay_type ovtype)
1254 {
1255         int ret, ov_id;
1256
1257         /* unittest device must be in before state */
1258         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1259                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1260                                 overlay_path(overlay_nr),
1261                                 unittest_path(unittest_nr, ovtype),
1262                                 !before ? "enabled" : "disabled");
1263                 return -EINVAL;
1264         }
1265
1266         /* apply the overlay */
1267         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, &ov_id);
1268         if (ret != 0) {
1269                 /* of_unittest_apply_overlay already called unittest() */
1270                 return ret;
1271         }
1272
1273         /* unittest device must be in after state */
1274         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1275                 unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1276                                 overlay_path(overlay_nr),
1277                                 unittest_path(unittest_nr, ovtype),
1278                                 !after ? "enabled" : "disabled");
1279                 return -EINVAL;
1280         }
1281
1282         ret = of_overlay_destroy(ov_id);
1283         if (ret != 0) {
1284                 unittest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
1285                                 overlay_path(overlay_nr),
1286                                 unittest_path(unittest_nr, ovtype));
1287                 return ret;
1288         }
1289
1290         /* unittest device must be again in before state */
1291         if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) {
1292                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1293                                 overlay_path(overlay_nr),
1294                                 unittest_path(unittest_nr, ovtype),
1295                                 !before ? "enabled" : "disabled");
1296                 return -EINVAL;
1297         }
1298
1299         return 0;
1300 }
1301
1302 /* test activation of device */
1303 static void of_unittest_overlay_0(void)
1304 {
1305         int ret;
1306
1307         /* device should enable */
1308         ret = of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
1309         if (ret != 0)
1310                 return;
1311
1312         unittest(1, "overlay test %d passed\n", 0);
1313 }
1314
1315 /* test deactivation of device */
1316 static void of_unittest_overlay_1(void)
1317 {
1318         int ret;
1319
1320         /* device should disable */
1321         ret = of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
1322         if (ret != 0)
1323                 return;
1324
1325         unittest(1, "overlay test %d passed\n", 1);
1326 }
1327
1328 /* test activation of device */
1329 static void of_unittest_overlay_2(void)
1330 {
1331         int ret;
1332
1333         /* device should enable */
1334         ret = of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
1335         if (ret != 0)
1336                 return;
1337
1338         unittest(1, "overlay test %d passed\n", 2);
1339 }
1340
1341 /* test deactivation of device */
1342 static void of_unittest_overlay_3(void)
1343 {
1344         int ret;
1345
1346         /* device should disable */
1347         ret = of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
1348         if (ret != 0)
1349                 return;
1350
1351         unittest(1, "overlay test %d passed\n", 3);
1352 }
1353
1354 /* test activation of a full device node */
1355 static void of_unittest_overlay_4(void)
1356 {
1357         int ret;
1358
1359         /* device should disable */
1360         ret = of_unittest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY);
1361         if (ret != 0)
1362                 return;
1363
1364         unittest(1, "overlay test %d passed\n", 4);
1365 }
1366
1367 /* test overlay apply/revert sequence */
1368 static void of_unittest_overlay_5(void)
1369 {
1370         int ret;
1371
1372         /* device should disable */
1373         ret = of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
1374         if (ret != 0)
1375                 return;
1376
1377         unittest(1, "overlay test %d passed\n", 5);
1378 }
1379
1380 /* test overlay application in sequence */
1381 static void of_unittest_overlay_6(void)
1382 {
1383         struct device_node *np;
1384         int ret, i, ov_id[2];
1385         int overlay_nr = 6, unittest_nr = 6;
1386         int before = 0, after = 1;
1387
1388         /* unittest device must be in before state */
1389         for (i = 0; i < 2; i++) {
1390                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1391                                 != before) {
1392                         unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1393                                         overlay_path(overlay_nr + i),
1394                                         unittest_path(unittest_nr + i,
1395                                                 PDEV_OVERLAY),
1396                                         !before ? "enabled" : "disabled");
1397                         return;
1398                 }
1399         }
1400
1401         /* apply the overlays */
1402         for (i = 0; i < 2; i++) {
1403
1404                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1405                 if (np == NULL) {
1406                         unittest(0, "could not find overlay node @\"%s\"\n",
1407                                         overlay_path(overlay_nr + i));
1408                         return;
1409                 }
1410
1411                 ret = of_overlay_create(np);
1412                 if (ret < 0)  {
1413                         unittest(0, "could not create overlay from \"%s\"\n",
1414                                         overlay_path(overlay_nr + i));
1415                         return;
1416                 }
1417                 ov_id[i] = ret;
1418                 of_unittest_track_overlay(ov_id[i]);
1419         }
1420
1421         for (i = 0; i < 2; i++) {
1422                 /* unittest device must be in after state */
1423                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1424                                 != after) {
1425                         unittest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
1426                                         overlay_path(overlay_nr + i),
1427                                         unittest_path(unittest_nr + i,
1428                                                 PDEV_OVERLAY),
1429                                         !after ? "enabled" : "disabled");
1430                         return;
1431                 }
1432         }
1433
1434         for (i = 1; i >= 0; i--) {
1435                 ret = of_overlay_destroy(ov_id[i]);
1436                 if (ret != 0) {
1437                         unittest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
1438                                         overlay_path(overlay_nr + i),
1439                                         unittest_path(unittest_nr + i,
1440                                                 PDEV_OVERLAY));
1441                         return;
1442                 }
1443                 of_unittest_untrack_overlay(ov_id[i]);
1444         }
1445
1446         for (i = 0; i < 2; i++) {
1447                 /* unittest device must be again in before state */
1448                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1449                                 != before) {
1450                         unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1451                                         overlay_path(overlay_nr + i),
1452                                         unittest_path(unittest_nr + i,
1453                                                 PDEV_OVERLAY),
1454                                         !before ? "enabled" : "disabled");
1455                         return;
1456                 }
1457         }
1458
1459         unittest(1, "overlay test %d passed\n", 6);
1460 }
1461
1462 /* test overlay application in sequence */
1463 static void of_unittest_overlay_8(void)
1464 {
1465         struct device_node *np;
1466         int ret, i, ov_id[2];
1467         int overlay_nr = 8, unittest_nr = 8;
1468
1469         /* we don't care about device state in this test */
1470
1471         /* apply the overlays */
1472         for (i = 0; i < 2; i++) {
1473
1474                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1475                 if (np == NULL) {
1476                         unittest(0, "could not find overlay node @\"%s\"\n",
1477                                         overlay_path(overlay_nr + i));
1478                         return;
1479                 }
1480
1481                 ret = of_overlay_create(np);
1482                 if (ret < 0)  {
1483                         unittest(0, "could not create overlay from \"%s\"\n",
1484                                         overlay_path(overlay_nr + i));
1485                         return;
1486                 }
1487                 ov_id[i] = ret;
1488                 of_unittest_track_overlay(ov_id[i]);
1489         }
1490
1491         /* now try to remove first overlay (it should fail) */
1492         ret = of_overlay_destroy(ov_id[0]);
1493         if (ret == 0) {
1494                 unittest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
1495                                 overlay_path(overlay_nr + 0),
1496                                 unittest_path(unittest_nr,
1497                                         PDEV_OVERLAY));
1498                 return;
1499         }
1500
1501         /* removing them in order should work */
1502         for (i = 1; i >= 0; i--) {
1503                 ret = of_overlay_destroy(ov_id[i]);
1504                 if (ret != 0) {
1505                         unittest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
1506                                         overlay_path(overlay_nr + i),
1507                                         unittest_path(unittest_nr,
1508                                                 PDEV_OVERLAY));
1509                         return;
1510                 }
1511                 of_unittest_untrack_overlay(ov_id[i]);
1512         }
1513
1514         unittest(1, "overlay test %d passed\n", 8);
1515 }
1516
1517 /* test insertion of a bus with parent devices */
1518 static void of_unittest_overlay_10(void)
1519 {
1520         int ret;
1521         char *child_path;
1522
1523         /* device should disable */
1524         ret = of_unittest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
1525         if (unittest(ret == 0,
1526                         "overlay test %d failed; overlay application\n", 10))
1527                 return;
1528
1529         child_path = kasprintf(GFP_KERNEL, "%s/test-unittest101",
1530                         unittest_path(10, PDEV_OVERLAY));
1531         if (unittest(child_path, "overlay test %d failed; kasprintf\n", 10))
1532                 return;
1533
1534         ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
1535         kfree(child_path);
1536         if (unittest(ret, "overlay test %d failed; no child device\n", 10))
1537                 return;
1538 }
1539
1540 /* test insertion of a bus with parent devices (and revert) */
1541 static void of_unittest_overlay_11(void)
1542 {
1543         int ret;
1544
1545         /* device should disable */
1546         ret = of_unittest_apply_revert_overlay_check(11, 11, 0, 1,
1547                         PDEV_OVERLAY);
1548         if (unittest(ret == 0,
1549                         "overlay test %d failed; overlay application\n", 11))
1550                 return;
1551 }
1552
1553 #if IS_BUILTIN(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
1554
1555 struct unittest_i2c_bus_data {
1556         struct platform_device  *pdev;
1557         struct i2c_adapter      adap;
1558 };
1559
1560 static int unittest_i2c_master_xfer(struct i2c_adapter *adap,
1561                 struct i2c_msg *msgs, int num)
1562 {
1563         struct unittest_i2c_bus_data *std = i2c_get_adapdata(adap);
1564
1565         (void)std;
1566
1567         return num;
1568 }
1569
1570 static u32 unittest_i2c_functionality(struct i2c_adapter *adap)
1571 {
1572         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
1573 }
1574
1575 static const struct i2c_algorithm unittest_i2c_algo = {
1576         .master_xfer    = unittest_i2c_master_xfer,
1577         .functionality  = unittest_i2c_functionality,
1578 };
1579
1580 static int unittest_i2c_bus_probe(struct platform_device *pdev)
1581 {
1582         struct device *dev = &pdev->dev;
1583         struct device_node *np = dev->of_node;
1584         struct unittest_i2c_bus_data *std;
1585         struct i2c_adapter *adap;
1586         int ret;
1587
1588         if (np == NULL) {
1589                 dev_err(dev, "No OF data for device\n");
1590                 return -EINVAL;
1591
1592         }
1593
1594         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1595
1596         std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
1597         if (!std) {
1598                 dev_err(dev, "Failed to allocate unittest i2c data\n");
1599                 return -ENOMEM;
1600         }
1601
1602         /* link them together */
1603         std->pdev = pdev;
1604         platform_set_drvdata(pdev, std);
1605
1606         adap = &std->adap;
1607         i2c_set_adapdata(adap, std);
1608         adap->nr = -1;
1609         strlcpy(adap->name, pdev->name, sizeof(adap->name));
1610         adap->class = I2C_CLASS_DEPRECATED;
1611         adap->algo = &unittest_i2c_algo;
1612         adap->dev.parent = dev;
1613         adap->dev.of_node = dev->of_node;
1614         adap->timeout = 5 * HZ;
1615         adap->retries = 3;
1616
1617         ret = i2c_add_numbered_adapter(adap);
1618         if (ret != 0) {
1619                 dev_err(dev, "Failed to add I2C adapter\n");
1620                 return ret;
1621         }
1622
1623         return 0;
1624 }
1625
1626 static int unittest_i2c_bus_remove(struct platform_device *pdev)
1627 {
1628         struct device *dev = &pdev->dev;
1629         struct device_node *np = dev->of_node;
1630         struct unittest_i2c_bus_data *std = platform_get_drvdata(pdev);
1631
1632         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1633         i2c_del_adapter(&std->adap);
1634
1635         return 0;
1636 }
1637
1638 static const struct of_device_id unittest_i2c_bus_match[] = {
1639         { .compatible = "unittest-i2c-bus", },
1640         {},
1641 };
1642
1643 static struct platform_driver unittest_i2c_bus_driver = {
1644         .probe                  = unittest_i2c_bus_probe,
1645         .remove                 = unittest_i2c_bus_remove,
1646         .driver = {
1647                 .name           = "unittest-i2c-bus",
1648                 .of_match_table = of_match_ptr(unittest_i2c_bus_match),
1649         },
1650 };
1651
1652 static int unittest_i2c_dev_probe(struct i2c_client *client,
1653                 const struct i2c_device_id *id)
1654 {
1655         struct device *dev = &client->dev;
1656         struct device_node *np = client->dev.of_node;
1657
1658         if (!np) {
1659                 dev_err(dev, "No OF node\n");
1660                 return -EINVAL;
1661         }
1662
1663         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1664
1665         return 0;
1666 };
1667
1668 static int unittest_i2c_dev_remove(struct i2c_client *client)
1669 {
1670         struct device *dev = &client->dev;
1671         struct device_node *np = client->dev.of_node;
1672
1673         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1674         return 0;
1675 }
1676
1677 static const struct i2c_device_id unittest_i2c_dev_id[] = {
1678         { .name = "unittest-i2c-dev" },
1679         { }
1680 };
1681
1682 static struct i2c_driver unittest_i2c_dev_driver = {
1683         .driver = {
1684                 .name = "unittest-i2c-dev",
1685         },
1686         .probe = unittest_i2c_dev_probe,
1687         .remove = unittest_i2c_dev_remove,
1688         .id_table = unittest_i2c_dev_id,
1689 };
1690
1691 #if IS_BUILTIN(CONFIG_I2C_MUX)
1692
1693 static int unittest_i2c_mux_select_chan(struct i2c_mux_core *muxc, u32 chan)
1694 {
1695         return 0;
1696 }
1697
1698 static int unittest_i2c_mux_probe(struct i2c_client *client,
1699                 const struct i2c_device_id *id)
1700 {
1701         int ret, i, nchans;
1702         struct device *dev = &client->dev;
1703         struct i2c_adapter *adap = to_i2c_adapter(dev->parent);
1704         struct device_node *np = client->dev.of_node, *child;
1705         struct i2c_mux_core *muxc;
1706         u32 reg, max_reg;
1707
1708         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1709
1710         if (!np) {
1711                 dev_err(dev, "No OF node\n");
1712                 return -EINVAL;
1713         }
1714
1715         max_reg = (u32)-1;
1716         for_each_child_of_node(np, child) {
1717                 ret = of_property_read_u32(child, "reg", &reg);
1718                 if (ret)
1719                         continue;
1720                 if (max_reg == (u32)-1 || reg > max_reg)
1721                         max_reg = reg;
1722         }
1723         nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
1724         if (nchans == 0) {
1725                 dev_err(dev, "No channels\n");
1726                 return -EINVAL;
1727         }
1728
1729         muxc = i2c_mux_alloc(adap, dev, nchans, 0, 0,
1730                              unittest_i2c_mux_select_chan, NULL);
1731         if (!muxc)
1732                 return -ENOMEM;
1733         for (i = 0; i < nchans; i++) {
1734                 ret = i2c_mux_add_adapter(muxc, 0, i, 0);
1735                 if (ret) {
1736                         dev_err(dev, "Failed to register mux #%d\n", i);
1737                         i2c_mux_del_adapters(muxc);
1738                         return -ENODEV;
1739                 }
1740         }
1741
1742         i2c_set_clientdata(client, muxc);
1743
1744         return 0;
1745 };
1746
1747 static int unittest_i2c_mux_remove(struct i2c_client *client)
1748 {
1749         struct device *dev = &client->dev;
1750         struct device_node *np = client->dev.of_node;
1751         struct i2c_mux_core *muxc = i2c_get_clientdata(client);
1752
1753         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1754         i2c_mux_del_adapters(muxc);
1755         return 0;
1756 }
1757
1758 static const struct i2c_device_id unittest_i2c_mux_id[] = {
1759         { .name = "unittest-i2c-mux" },
1760         { }
1761 };
1762
1763 static struct i2c_driver unittest_i2c_mux_driver = {
1764         .driver = {
1765                 .name = "unittest-i2c-mux",
1766         },
1767         .probe = unittest_i2c_mux_probe,
1768         .remove = unittest_i2c_mux_remove,
1769         .id_table = unittest_i2c_mux_id,
1770 };
1771
1772 #endif
1773
1774 static int of_unittest_overlay_i2c_init(void)
1775 {
1776         int ret;
1777
1778         ret = i2c_add_driver(&unittest_i2c_dev_driver);
1779         if (unittest(ret == 0,
1780                         "could not register unittest i2c device driver\n"))
1781                 return ret;
1782
1783         ret = platform_driver_register(&unittest_i2c_bus_driver);
1784         if (unittest(ret == 0,
1785                         "could not register unittest i2c bus driver\n"))
1786                 return ret;
1787
1788 #if IS_BUILTIN(CONFIG_I2C_MUX)
1789         ret = i2c_add_driver(&unittest_i2c_mux_driver);
1790         if (unittest(ret == 0,
1791                         "could not register unittest i2c mux driver\n"))
1792                 return ret;
1793 #endif
1794
1795         return 0;
1796 }
1797
1798 static void of_unittest_overlay_i2c_cleanup(void)
1799 {
1800 #if IS_BUILTIN(CONFIG_I2C_MUX)
1801         i2c_del_driver(&unittest_i2c_mux_driver);
1802 #endif
1803         platform_driver_unregister(&unittest_i2c_bus_driver);
1804         i2c_del_driver(&unittest_i2c_dev_driver);
1805 }
1806
1807 static void of_unittest_overlay_i2c_12(void)
1808 {
1809         int ret;
1810
1811         /* device should enable */
1812         ret = of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
1813         if (ret != 0)
1814                 return;
1815
1816         unittest(1, "overlay test %d passed\n", 12);
1817 }
1818
1819 /* test deactivation of device */
1820 static void of_unittest_overlay_i2c_13(void)
1821 {
1822         int ret;
1823
1824         /* device should disable */
1825         ret = of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
1826         if (ret != 0)
1827                 return;
1828
1829         unittest(1, "overlay test %d passed\n", 13);
1830 }
1831
1832 /* just check for i2c mux existence */
1833 static void of_unittest_overlay_i2c_14(void)
1834 {
1835 }
1836
1837 static void of_unittest_overlay_i2c_15(void)
1838 {
1839         int ret;
1840
1841         /* device should enable */
1842         ret = of_unittest_apply_overlay_check(15, 15, 0, 1, I2C_OVERLAY);
1843         if (ret != 0)
1844                 return;
1845
1846         unittest(1, "overlay test %d passed\n", 15);
1847 }
1848
1849 #else
1850
1851 static inline void of_unittest_overlay_i2c_14(void) { }
1852 static inline void of_unittest_overlay_i2c_15(void) { }
1853
1854 #endif
1855
1856 static void __init of_unittest_overlay(void)
1857 {
1858         struct device_node *bus_np = NULL;
1859         int ret;
1860
1861         ret = platform_driver_register(&unittest_driver);
1862         if (ret != 0) {
1863                 unittest(0, "could not register unittest driver\n");
1864                 goto out;
1865         }
1866
1867         bus_np = of_find_node_by_path(bus_path);
1868         if (bus_np == NULL) {
1869                 unittest(0, "could not find bus_path \"%s\"\n", bus_path);
1870                 goto out;
1871         }
1872
1873         ret = of_platform_default_populate(bus_np, NULL, NULL);
1874         if (ret != 0) {
1875                 unittest(0, "could not populate bus @ \"%s\"\n", bus_path);
1876                 goto out;
1877         }
1878
1879         if (!of_unittest_device_exists(100, PDEV_OVERLAY)) {
1880                 unittest(0, "could not find unittest0 @ \"%s\"\n",
1881                                 unittest_path(100, PDEV_OVERLAY));
1882                 goto out;
1883         }
1884
1885         if (of_unittest_device_exists(101, PDEV_OVERLAY)) {
1886                 unittest(0, "unittest1 @ \"%s\" should not exist\n",
1887                                 unittest_path(101, PDEV_OVERLAY));
1888                 goto out;
1889         }
1890
1891         unittest(1, "basic infrastructure of overlays passed");
1892
1893         /* tests in sequence */
1894         of_unittest_overlay_0();
1895         of_unittest_overlay_1();
1896         of_unittest_overlay_2();
1897         of_unittest_overlay_3();
1898         of_unittest_overlay_4();
1899         of_unittest_overlay_5();
1900         of_unittest_overlay_6();
1901         of_unittest_overlay_8();
1902
1903         of_unittest_overlay_10();
1904         of_unittest_overlay_11();
1905
1906 #if IS_BUILTIN(CONFIG_I2C)
1907         if (unittest(of_unittest_overlay_i2c_init() == 0, "i2c init failed\n"))
1908                 goto out;
1909
1910         of_unittest_overlay_i2c_12();
1911         of_unittest_overlay_i2c_13();
1912         of_unittest_overlay_i2c_14();
1913         of_unittest_overlay_i2c_15();
1914
1915         of_unittest_overlay_i2c_cleanup();
1916 #endif
1917
1918         of_unittest_destroy_tracked_overlays();
1919
1920 out:
1921         of_node_put(bus_np);
1922 }
1923
1924 #else
1925 static inline void __init of_unittest_overlay(void) { }
1926 #endif
1927
1928 static int __init of_unittest(void)
1929 {
1930         struct device_node *np;
1931         int res;
1932
1933         /* adding data for unittest */
1934         res = unittest_data_add();
1935         if (res)
1936                 return res;
1937         if (!of_aliases)
1938                 of_aliases = of_find_node_by_path("/aliases");
1939
1940         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
1941         if (!np) {
1942                 pr_info("No testcase data in device tree; not running tests\n");
1943                 return 0;
1944         }
1945         of_node_put(np);
1946
1947         pr_info("start of unittest - you will see error messages\n");
1948         of_unittest_check_tree_linkage();
1949         of_unittest_check_phandles();
1950         of_unittest_find_node_by_name();
1951         of_unittest_dynamic();
1952         of_unittest_parse_phandle_with_args();
1953         of_unittest_property_string();
1954         of_unittest_property_copy();
1955         of_unittest_changeset();
1956         of_unittest_parse_interrupts();
1957         of_unittest_parse_interrupts_extended();
1958         of_unittest_match_node();
1959         of_unittest_platform_populate();
1960         of_unittest_overlay();
1961
1962         /* Double check linkage after removing testcase data */
1963         of_unittest_check_tree_linkage();
1964
1965         pr_info("end of unittest - %i passed, %i failed\n",
1966                 unittest_results.passed, unittest_results.failed);
1967
1968         return 0;
1969 }
1970 late_initcall(of_unittest);