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 #include <linux/of_platform.h>
  21
  22 #include <linux/i2c.h>
  23 #include <linux/i2c-mux.h>
  24
  25 #include <linux/bitops.h>
  26
  27 #include "of_private.h"
  28
  29 static struct unittest_results {
  30         int passed;
  31         int failed;
  32 } unittest_results;
  33
  34 #define unittest(result, fmt, ...) ({ \
  35         bool failed = !(result); \
  36         if (failed) { \
  37                 unittest_results.failed++; \
  38                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  39         } else { \
  40                 unittest_results.passed++; \
  41                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  42         } \
  43         failed; \
  44 })
  45
  46 static void __init of_unittest_find_node_by_name(void)
  47 {
  48         struct device_node *np;
  49         const char *options;
  50
  51         np = of_find_node_by_path("/testcase-data");
  52         unittest(np && !strcmp("/testcase-data", np->full_name),
  53                 "find /testcase-data failed\n");
  54         of_node_put(np);
  55
  56         /* Test if trailing '/' works */
  57         np = of_find_node_by_path("/testcase-data/");
  58         unittest(!np, "trailing '/' on /testcase-data/ should fail\n");
  59
  60         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  61         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  62                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  63         of_node_put(np);
  64
  65         np = of_find_node_by_path("testcase-alias");
  66         unittest(np && !strcmp("/testcase-data", np->full_name),
  67                 "find testcase-alias failed\n");
  68         of_node_put(np);
  69
  70         /* Test if trailing '/' works on aliases */
  71         np = of_find_node_by_path("testcase-alias/");
  72         unittest(!np, "trailing '/' on testcase-alias/ should fail\n");
  73
  74         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  75         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  76                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  77         of_node_put(np);
  78
  79         np = of_find_node_by_path("/testcase-data/missing-path");
  80         unittest(!np, "non-existent path returned node %s\n", np->full_name);
  81         of_node_put(np);
  82
  83         np = of_find_node_by_path("missing-alias");
  84         unittest(!np, "non-existent alias returned node %s\n", np->full_name);
  85         of_node_put(np);
  86
  87         np = of_find_node_by_path("testcase-alias/missing-path");
  88         unittest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  89         of_node_put(np);
  90
  91         np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
  92         unittest(np && !strcmp("testoption", options),
  93                  "option path test failed\n");
  94         of_node_put(np);
  95
  96         np = of_find_node_opts_by_path("/testcase-data:test/option", &options);
  97         unittest(np && !strcmp("test/option", options),
  98                  "option path test, subcase #1 failed\n");
  99         of_node_put(np);
 100
 101         np = of_find_node_opts_by_path("/testcase-data/testcase-device1:test/option", &options);
 102         unittest(np && !strcmp("test/option", options),
 103                  "option path test, subcase #2 failed\n");
 104         of_node_put(np);
 105
 106         np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
 107         unittest(np, "NULL option path test failed\n");
 108         of_node_put(np);
 109
 110         np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
 111                                        &options);
 112         unittest(np && !strcmp("testaliasoption", options),
 113                  "option alias path test failed\n");
 114         of_node_put(np);
 115
 116         np = of_find_node_opts_by_path("testcase-alias:test/alias/option",
 117                                        &options);
 118         unittest(np && !strcmp("test/alias/option", options),
 119                  "option alias path test, subcase #1 failed\n");
 120         of_node_put(np);
 121
 122         np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
 123         unittest(np, "NULL option alias path test failed\n");
 124         of_node_put(np);
 125
 126         options = "testoption";
 127         np = of_find_node_opts_by_path("testcase-alias", &options);
 128         unittest(np && !options, "option clearing test failed\n");
 129         of_node_put(np);
 130
 131         options = "testoption";
 132         np = of_find_node_opts_by_path("/", &options);
 133         unittest(np && !options, "option clearing root node test failed\n");
 134         of_node_put(np);
 135 }
 136
 137 static void __init of_unittest_dynamic(void)
 138 {
 139         struct device_node *np;
 140         struct property *prop;
 141
 142         np = of_find_node_by_path("/testcase-data");
 143         if (!np) {
 144                 pr_err("missing testcase data\n");
 145                 return;
 146         }
 147
 148         /* Array of 4 properties for the purpose of testing */
 149         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
 150         if (!prop) {
 151                 unittest(0, "kzalloc() failed\n");
 152                 return;
 153         }
 154
 155         /* Add a new property - should pass*/
 156         prop->name = "new-property";
 157         prop->value = "new-property-data";
 158         prop->length = strlen(prop->value);
 159         unittest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 160
 161         /* Try to add an existing property - should fail */
 162         prop++;
 163         prop->name = "new-property";
 164         prop->value = "new-property-data-should-fail";
 165         prop->length = strlen(prop->value);
 166         unittest(of_add_property(np, prop) != 0,
 167                  "Adding an existing property should have failed\n");
 168
 169         /* Try to modify an existing property - should pass */
 170         prop->value = "modify-property-data-should-pass";
 171         prop->length = strlen(prop->value);
 172         unittest(of_update_property(np, prop) == 0,
 173                  "Updating an existing property should have passed\n");
 174
 175         /* Try to modify non-existent property - should pass*/
 176         prop++;
 177         prop->name = "modify-property";
 178         prop->value = "modify-missing-property-data-should-pass";
 179         prop->length = strlen(prop->value);
 180         unittest(of_update_property(np, prop) == 0,
 181                  "Updating a missing property should have passed\n");
 182
 183         /* Remove property - should pass */
 184         unittest(of_remove_property(np, prop) == 0,
 185                  "Removing a property should have passed\n");
 186
 187         /* Adding very large property - should pass */
 188         prop++;
 189         prop->name = "large-property-PAGE_SIZEx8";
 190         prop->length = PAGE_SIZE * 8;
 191         prop->value = kzalloc(prop->length, GFP_KERNEL);
 192         unittest(prop->value != NULL, "Unable to allocate large buffer\n");
 193         if (prop->value)
 194                 unittest(of_add_property(np, prop) == 0,
 195                          "Adding a large property should have passed\n");
 196 }
 197
 198 static int __init of_unittest_check_node_linkage(struct device_node *np)
 199 {
 200         struct device_node *child;
 201         int count = 0, rc;
 202
 203         for_each_child_of_node(np, child) {
 204                 if (child->parent != np) {
 205                         pr_err("Child node %s links to wrong parent %s\n",
 206                                  child->name, np->name);
 207                         rc = -EINVAL;
 208                         goto put_child;
 209                 }
 210
 211                 rc = of_unittest_check_node_linkage(child);
 212                 if (rc < 0)
 213                         goto put_child;
 214                 count += rc;
 215         }
 216
 217         return count + 1;
 218 put_child:
 219         of_node_put(child);
 220         return rc;
 221 }
 222
 223 static void __init of_unittest_check_tree_linkage(void)
 224 {
 225         struct device_node *np;
 226         int allnode_count = 0, child_count;
 227
 228         if (!of_root)
 229                 return;
 230
 231         for_each_of_allnodes(np)
 232                 allnode_count++;
 233         child_count = of_unittest_check_node_linkage(of_root);
 234
 235         unittest(child_count > 0, "Device node data structure is corrupted\n");
 236         unittest(child_count == allnode_count,
 237                  "allnodes list size (%i) doesn't match sibling lists size (%i)\n",
 238                  allnode_count, child_count);
 239         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 240 }
 241
 242 struct node_hash {
 243         struct hlist_node node;
 244         struct device_node *np;
 245 };
 246
 247 static DEFINE_HASHTABLE(phandle_ht, 8);
 248 static void __init of_unittest_check_phandles(void)
 249 {
 250         struct device_node *np;
 251         struct node_hash *nh;
 252         struct hlist_node *tmp;
 253         int i, dup_count = 0, phandle_count = 0;
 254
 255         for_each_of_allnodes(np) {
 256                 if (!np->phandle)
 257                         continue;
 258
 259                 hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
 260                         if (nh->np->phandle == np->phandle) {
 261                                 pr_info("Duplicate phandle! %i used by %s and %s\n",
 262                                         np->phandle, nh->np->full_name, np->full_name);
 263                                 dup_count++;
 264                                 break;
 265                         }
 266                 }
 267
 268                 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 269                 if (WARN_ON(!nh))
 270                         return;
 271
 272                 nh->np = np;
 273                 hash_add(phandle_ht, &nh->node, np->phandle);
 274                 phandle_count++;
 275         }
 276         unittest(dup_count == 0, "Found %i duplicates in %i phandles\n",
 277                  dup_count, phandle_count);
 278
 279         /* Clean up */
 280         hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
 281                 hash_del(&nh->node);
 282                 kfree(nh);
 283         }
 284 }
 285
 286 static void __init of_unittest_parse_phandle_with_args(void)
 287 {
 288         struct device_node *np;
 289         struct of_phandle_args args;
 290         int i, rc;
 291
 292         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 293         if (!np) {
 294                 pr_err("missing testcase data\n");
 295                 return;
 296         }
 297
 298         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 299         unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 300
 301         for (i = 0; i < 8; i++) {
 302                 bool passed = true;
 303
 304                 rc = of_parse_phandle_with_args(np, "phandle-list",
 305                                                 "#phandle-cells", i, &args);
 306
 307                 /* Test the values from tests-phandle.dtsi */
 308                 switch (i) {
 309                 case 0:
 310                         passed &= !rc;
 311                         passed &= (args.args_count == 1);
 312                         passed &= (args.args[0] == (i + 1));
 313                         break;
 314                 case 1:
 315                         passed &= !rc;
 316                         passed &= (args.args_count == 2);
 317                         passed &= (args.args[0] == (i + 1));
 318                         passed &= (args.args[1] == 0);
 319                         break;
 320                 case 2:
 321                         passed &= (rc == -ENOENT);
 322                         break;
 323                 case 3:
 324                         passed &= !rc;
 325                         passed &= (args.args_count == 3);
 326                         passed &= (args.args[0] == (i + 1));
 327                         passed &= (args.args[1] == 4);
 328                         passed &= (args.args[2] == 3);
 329                         break;
 330                 case 4:
 331                         passed &= !rc;
 332                         passed &= (args.args_count == 2);
 333                         passed &= (args.args[0] == (i + 1));
 334                         passed &= (args.args[1] == 100);
 335                         break;
 336                 case 5:
 337                         passed &= !rc;
 338                         passed &= (args.args_count == 0);
 339                         break;
 340                 case 6:
 341                         passed &= !rc;
 342                         passed &= (args.args_count == 1);
 343                         passed &= (args.args[0] == (i + 1));
 344                         break;
 345                 case 7:
 346                         passed &= (rc == -ENOENT);
 347                         break;
 348                 default:
 349                         passed = false;
 350                 }
 351
 352                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 353                          i, args.np->full_name, rc);
 354         }
 355
 356         /* Check for missing list property */
 357         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 358                                         "#phandle-cells", 0, &args);
 359         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 360         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 361                                         "#phandle-cells");
 362         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 363
 364         /* Check for missing cells property */
 365         rc = of_parse_phandle_with_args(np, "phandle-list",
 366                                         "#phandle-cells-missing", 0, &args);
 367         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 368         rc = of_count_phandle_with_args(np, "phandle-list",
 369                                         "#phandle-cells-missing");
 370         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 371
 372         /* Check for bad phandle in list */
 373         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 374                                         "#phandle-cells", 0, &args);
 375         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 376         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 377                                         "#phandle-cells");
 378         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 379
 380         /* Check for incorrectly formed argument list */
 381         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 382                                         "#phandle-cells", 1, &args);
 383         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 384         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 385                                         "#phandle-cells");
 386         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 387 }
 388
 389 static void __init of_unittest_property_string(void)
 390 {
 391         const char *strings[4];
 392         struct device_node *np;
 393         int rc;
 394
 395         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 396         if (!np) {
 397                 pr_err("No testcase data in device tree\n");
 398                 return;
 399         }
 400
 401         rc = of_property_match_string(np, "phandle-list-names", "first");
 402         unittest(rc == 0, "first expected:0 got:%i\n", rc);
 403         rc = of_property_match_string(np, "phandle-list-names", "second");
 404         unittest(rc == 1, "second expected:1 got:%i\n", rc);
 405         rc = of_property_match_string(np, "phandle-list-names", "third");
 406         unittest(rc == 2, "third expected:2 got:%i\n", rc);
 407         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 408         unittest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
 409         rc = of_property_match_string(np, "missing-property", "blah");
 410         unittest(rc == -EINVAL, "missing property; rc=%i\n", rc);
 411         rc = of_property_match_string(np, "empty-property", "blah");
 412         unittest(rc == -ENODATA, "empty property; rc=%i\n", rc);
 413         rc = of_property_match_string(np, "unterminated-string", "blah");
 414         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 415
 416         /* of_property_count_strings() tests */
 417         rc = of_property_count_strings(np, "string-property");
 418         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 419         rc = of_property_count_strings(np, "phandle-list-names");
 420         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 421         rc = of_property_count_strings(np, "unterminated-string");
 422         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 423         rc = of_property_count_strings(np, "unterminated-string-list");
 424         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 425
 426         /* of_property_read_string_index() tests */
 427         rc = of_property_read_string_index(np, "string-property", 0, strings);
 428         unittest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
 429         strings[0] = NULL;
 430         rc = of_property_read_string_index(np, "string-property", 1, strings);
 431         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 432         rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
 433         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 434         rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
 435         unittest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
 436         rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
 437         unittest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
 438         strings[0] = NULL;
 439         rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
 440         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 441         strings[0] = NULL;
 442         rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
 443         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 444         rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
 445         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 446         strings[0] = NULL;
 447         rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
 448         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 449         strings[1] = NULL;
 450
 451         /* of_property_read_string_array() tests */
 452         rc = of_property_read_string_array(np, "string-property", strings, 4);
 453         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 454         rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
 455         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 456         rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
 457         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 458         /* -- An incorrectly formed string should cause a failure */
 459         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
 460         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 461         /* -- parsing the correctly formed strings should still work: */
 462         strings[2] = NULL;
 463         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
 464         unittest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
 465         strings[1] = NULL;
 466         rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
 467         unittest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
 468 }
 469
 470 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 471                         (p1)->value && (p2)->value && \
 472                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 473                         !strcmp((p1)->name, (p2)->name))
 474 static void __init of_unittest_property_copy(void)
 475 {
 476 #ifdef CONFIG_OF_DYNAMIC
 477         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 478         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 479         struct property *new;
 480
 481         new = __of_prop_dup(&p1, GFP_KERNEL);
 482         unittest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 483         kfree(new->value);
 484         kfree(new->name);
 485         kfree(new);
 486
 487         new = __of_prop_dup(&p2, GFP_KERNEL);
 488         unittest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 489         kfree(new->value);
 490         kfree(new->name);
 491         kfree(new);
 492 #endif
 493 }
 494
 495 static void __init of_unittest_changeset(void)
 496 {
 497 #ifdef CONFIG_OF_DYNAMIC
 498         struct property *ppadd, padd = { .name = "prop-add", .length = 0, .value = "" };
 499         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 500         struct property *ppremove;
 501         struct device_node *n1, *n2, *n21, *nremove, *parent, *np;
 502         struct of_changeset chgset;
 503
 504         n1 = __of_node_dup(NULL, "/testcase-data/changeset/n1");
 505         unittest(n1, "testcase setup failure\n");
 506         n2 = __of_node_dup(NULL, "/testcase-data/changeset/n2");
 507         unittest(n2, "testcase setup failure\n");
 508         n21 = __of_node_dup(NULL, "%s/%s", "/testcase-data/changeset/n2", "n21");
 509         unittest(n21, "testcase setup failure %p\n", n21);
 510         nremove = of_find_node_by_path("/testcase-data/changeset/node-remove");
 511         unittest(nremove, "testcase setup failure\n");
 512         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 513         unittest(ppadd, "testcase setup failure\n");
 514         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 515         unittest(ppupdate, "testcase setup failure\n");
 516         parent = nremove->parent;
 517         n1->parent = parent;
 518         n2->parent = parent;
 519         n21->parent = n2;
 520         n2->child = n21;
 521         ppremove = of_find_property(parent, "prop-remove", NULL);
 522         unittest(ppremove, "failed to find removal prop");
 523
 524         of_changeset_init(&chgset);
 525         unittest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 526         unittest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 527         unittest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 528         unittest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 529         unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
 530         unittest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 531         unittest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 532         unittest(!of_changeset_apply(&chgset), "apply failed\n");
 533
 534         /* Make sure node names are constructed correctly */
 535         unittest((np = of_find_node_by_path("/testcase-data/changeset/n2/n21")),
 536                  "'%s' not added\n", n21->full_name);
 537         of_node_put(np);
 538
 539         unittest(!of_changeset_revert(&chgset), "revert failed\n");
 540
 541         of_changeset_destroy(&chgset);
 542 #endif
 543 }
 544
 545 static void __init of_unittest_parse_interrupts(void)
 546 {
 547         struct device_node *np;
 548         struct of_phandle_args args;
 549         int i, rc;
 550
 551         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 552         if (!np) {
 553                 pr_err("missing testcase data\n");
 554                 return;
 555         }
 556
 557         for (i = 0; i < 4; i++) {
 558                 bool passed = true;
 559
 560                 args.args_count = 0;
 561                 rc = of_irq_parse_one(np, i, &args);
 562
 563                 passed &= !rc;
 564                 passed &= (args.args_count == 1);
 565                 passed &= (args.args[0] == (i + 1));
 566
 567                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 568                          i, args.np->full_name, rc);
 569         }
 570         of_node_put(np);
 571
 572         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 573         if (!np) {
 574                 pr_err("missing testcase data\n");
 575                 return;
 576         }
 577
 578         for (i = 0; i < 4; i++) {
 579                 bool passed = true;
 580
 581                 args.args_count = 0;
 582                 rc = of_irq_parse_one(np, i, &args);
 583
 584                 /* Test the values from tests-phandle.dtsi */
 585                 switch (i) {
 586                 case 0:
 587                         passed &= !rc;
 588                         passed &= (args.args_count == 1);
 589                         passed &= (args.args[0] == 9);
 590                         break;
 591                 case 1:
 592                         passed &= !rc;
 593                         passed &= (args.args_count == 3);
 594                         passed &= (args.args[0] == 10);
 595                         passed &= (args.args[1] == 11);
 596                         passed &= (args.args[2] == 12);
 597                         break;
 598                 case 2:
 599                         passed &= !rc;
 600                         passed &= (args.args_count == 2);
 601                         passed &= (args.args[0] == 13);
 602                         passed &= (args.args[1] == 14);
 603                         break;
 604                 case 3:
 605                         passed &= !rc;
 606                         passed &= (args.args_count == 2);
 607                         passed &= (args.args[0] == 15);
 608                         passed &= (args.args[1] == 16);
 609                         break;
 610                 default:
 611                         passed = false;
 612                 }
 613                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 614                          i, args.np->full_name, rc);
 615         }
 616         of_node_put(np);
 617 }
 618
 619 static void __init of_unittest_parse_interrupts_extended(void)
 620 {
 621         struct device_node *np;
 622         struct of_phandle_args args;
 623         int i, rc;
 624
 625         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 626         if (!np) {
 627                 pr_err("missing testcase data\n");
 628                 return;
 629         }
 630
 631         for (i = 0; i < 7; i++) {
 632                 bool passed = true;
 633
 634                 rc = of_irq_parse_one(np, i, &args);
 635
 636                 /* Test the values from tests-phandle.dtsi */
 637                 switch (i) {
 638                 case 0:
 639                         passed &= !rc;
 640                         passed &= (args.args_count == 1);
 641                         passed &= (args.args[0] == 1);
 642                         break;
 643                 case 1:
 644                         passed &= !rc;
 645                         passed &= (args.args_count == 3);
 646                         passed &= (args.args[0] == 2);
 647                         passed &= (args.args[1] == 3);
 648                         passed &= (args.args[2] == 4);
 649                         break;
 650                 case 2:
 651                         passed &= !rc;
 652                         passed &= (args.args_count == 2);
 653                         passed &= (args.args[0] == 5);
 654                         passed &= (args.args[1] == 6);
 655                         break;
 656                 case 3:
 657                         passed &= !rc;
 658                         passed &= (args.args_count == 1);
 659                         passed &= (args.args[0] == 9);
 660                         break;
 661                 case 4:
 662                         passed &= !rc;
 663                         passed &= (args.args_count == 3);
 664                         passed &= (args.args[0] == 10);
 665                         passed &= (args.args[1] == 11);
 666                         passed &= (args.args[2] == 12);
 667                         break;
 668                 case 5:
 669                         passed &= !rc;
 670                         passed &= (args.args_count == 2);
 671                         passed &= (args.args[0] == 13);
 672                         passed &= (args.args[1] == 14);
 673                         break;
 674                 case 6:
 675                         passed &= !rc;
 676                         passed &= (args.args_count == 1);
 677                         passed &= (args.args[0] == 15);
 678                         break;
 679                 default:
 680                         passed = false;
 681                 }
 682
 683                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 684                          i, args.np->full_name, rc);
 685         }
 686         of_node_put(np);
 687 }
 688
 689 static const struct of_device_id match_node_table[] = {
 690         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 691         { .data = "B", .type = "type1", }, /* followed by type alone */
 692
 693         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 694         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 695         { .data = "Cc", .name = "name2", .type = "type2", },
 696
 697         { .data = "E", .compatible = "compat3" },
 698         { .data = "G", .compatible = "compat2", },
 699         { .data = "H", .compatible = "compat2", .name = "name5", },
 700         { .data = "I", .compatible = "compat2", .type = "type1", },
 701         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 702         { .data = "K", .compatible = "compat2", .name = "name9", },
 703         {}
 704 };
 705
 706 static struct {
 707         const char *path;
 708         const char *data;
 709 } match_node_tests[] = {
 710         { .path = "/testcase-data/match-node/name0", .data = "A", },
 711         { .path = "/testcase-data/match-node/name1", .data = "B", },
 712         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 713         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 714         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 715         { .path = "/testcase-data/match-node/name3", .data = "E", },
 716         { .path = "/testcase-data/match-node/name4", .data = "G", },
 717         { .path = "/testcase-data/match-node/name5", .data = "H", },
 718         { .path = "/testcase-data/match-node/name6", .data = "G", },
 719         { .path = "/testcase-data/match-node/name7", .data = "I", },
 720         { .path = "/testcase-data/match-node/name8", .data = "J", },
 721         { .path = "/testcase-data/match-node/name9", .data = "K", },
 722 };
 723
 724 static void __init of_unittest_match_node(void)
 725 {
 726         struct device_node *np;
 727         const struct of_device_id *match;
 728         int i;
 729
 730         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 731                 np = of_find_node_by_path(match_node_tests[i].path);
 732                 if (!np) {
 733                         unittest(0, "missing testcase node %s\n",
 734                                 match_node_tests[i].path);
 735                         continue;
 736                 }
 737
 738                 match = of_match_node(match_node_table, np);
 739                 if (!match) {
 740                         unittest(0, "%s didn't match anything\n",
 741                                 match_node_tests[i].path);
 742                         continue;
 743                 }
 744
 745                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 746                         unittest(0, "%s got wrong match. expected %s, got %s\n",
 747                                 match_node_tests[i].path, match_node_tests[i].data,
 748                                 (const char *)match->data);
 749                         continue;
 750                 }
 751                 unittest(1, "passed");
 752         }
 753 }
 754
 755 static struct resource test_bus_res = {
 756         .start = 0xfffffff8,
 757         .end = 0xfffffff9,
 758         .flags = IORESOURCE_MEM,
 759 };
 760 static const struct platform_device_info test_bus_info = {
 761         .name = "unittest-bus",
 762 };
 763 static void __init of_unittest_platform_populate(void)
 764 {
 765         int irq, rc;
 766         struct device_node *np, *child, *grandchild;
 767         struct platform_device *pdev, *test_bus;
 768         const struct of_device_id match[] = {
 769                 { .compatible = "test-device", },
 770                 {}
 771         };
 772
 773         np = of_find_node_by_path("/testcase-data");
 774         of_platform_default_populate(np, NULL, NULL);
 775
 776         /* Test that a missing irq domain returns -EPROBE_DEFER */
 777         np = of_find_node_by_path("/testcase-data/testcase-device1");
 778         pdev = of_find_device_by_node(np);
 779         unittest(pdev, "device 1 creation failed\n");
 780
 781         irq = platform_get_irq(pdev, 0);
 782         unittest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 783
 784         /* Test that a parsing failure does not return -EPROBE_DEFER */
 785         np = of_find_node_by_path("/testcase-data/testcase-device2");
 786         pdev = of_find_device_by_node(np);
 787         unittest(pdev, "device 2 creation failed\n");
 788         irq = platform_get_irq(pdev, 0);
 789         unittest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 790
 791         np = of_find_node_by_path("/testcase-data/platform-tests");
 792         unittest(np, "No testcase data in device tree\n");
 793         if (!np)
 794                 return;
 795
 796         test_bus = platform_device_register_full(&test_bus_info);
 797         rc = PTR_ERR_OR_ZERO(test_bus);
 798         unittest(!rc, "testbus registration failed; rc=%i\n", rc);
 799         if (rc)
 800                 return;
 801         test_bus->dev.of_node = np;
 802
 803         /*
 804          * Add a dummy resource to the test bus node after it is
 805          * registered to catch problems with un-inserted resources. The
 806          * DT code doesn't insert the resources, and it has caused the
 807          * kernel to oops in the past. This makes sure the same bug
 808          * doesn't crop up again.
 809          */
 810         platform_device_add_resources(test_bus, &test_bus_res, 1);
 811
 812         of_platform_populate(np, match, NULL, &test_bus->dev);
 813         for_each_child_of_node(np, child) {
 814                 for_each_child_of_node(child, grandchild)
 815                         unittest(of_find_device_by_node(grandchild),
 816                                  "Could not create device for node '%s'\n",
 817                                  grandchild->name);
 818         }
 819
 820         of_platform_depopulate(&test_bus->dev);
 821         for_each_child_of_node(np, child) {
 822                 for_each_child_of_node(child, grandchild)
 823                         unittest(!of_find_device_by_node(grandchild),
 824                                  "device didn't get destroyed '%s'\n",
 825                                  grandchild->name);
 826         }
 827
 828         platform_device_unregister(test_bus);
 829         of_node_put(np);
 830 }
 831
 832 /**
 833  *      update_node_properties - adds the properties
 834  *      of np into dup node (present in live tree) and
 835  *      updates parent of children of np to dup.
 836  *
 837  *      @np:    node already present in live tree
 838  *      @dup:   node present in live tree to be updated
 839  */
 840 static void update_node_properties(struct device_node *np,
 841                                         struct device_node *dup)
 842 {
 843         struct property *prop;
 844         struct device_node *child;
 845
 846         for_each_property_of_node(np, prop)
 847                 of_add_property(dup, prop);
 848
 849         for_each_child_of_node(np, child)
 850                 child->parent = dup;
 851 }
 852
 853 /**
 854  *      attach_node_and_children - attaches nodes
 855  *      and its children to live tree
 856  *
 857  *      @np:    Node to attach to live tree
 858  */
 859 static int attach_node_and_children(struct device_node *np)
 860 {
 861         struct device_node *next, *dup, *child;
 862         unsigned long flags;
 863
 864         dup = of_find_node_by_path(np->full_name);
 865         if (dup) {
 866                 update_node_properties(np, dup);
 867                 return 0;
 868         }
 869
 870         child = np->child;
 871         np->child = NULL;
 872
 873         mutex_lock(&of_mutex);
 874         raw_spin_lock_irqsave(&devtree_lock, flags);
 875         np->sibling = np->parent->child;
 876         np->parent->child = np;
 877         of_node_clear_flag(np, OF_DETACHED);
 878         raw_spin_unlock_irqrestore(&devtree_lock, flags);
 879
 880         __of_attach_node_sysfs(np);
 881         mutex_unlock(&of_mutex);
 882
 883         while (child) {
 884                 next = child->sibling;
 885                 attach_node_and_children(child);
 886                 child = next;
 887         }
 888
 889         return 0;
 890 }
 891
 892 /**
 893  *      unittest_data_add - Reads, copies data from
 894  *      linked tree and attaches it to the live tree
 895  */
 896 static int __init unittest_data_add(void)
 897 {
 898         void *unittest_data;
 899         struct device_node *unittest_data_node, *np;
 900         /*
 901          * __dtb_testcases_begin[] and __dtb_testcases_end[] are magically
 902          * created by cmd_dt_S_dtb in scripts/Makefile.lib
 903          */
 904         extern uint8_t __dtb_testcases_begin[];
 905         extern uint8_t __dtb_testcases_end[];
 906         const int size = __dtb_testcases_end - __dtb_testcases_begin;
 907         int rc;
 908
 909         if (!size) {
 910                 pr_warn("%s: No testcase data to attach; not running tests\n",
 911                         __func__);
 912                 return -ENODATA;
 913         }
 914
 915         /* creating copy */
 916         unittest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
 917
 918         if (!unittest_data) {
 919                 pr_warn("%s: Failed to allocate memory for unittest_data; "
 920                         "not running tests\n", __func__);
 921                 return -ENOMEM;
 922         }
 923         of_fdt_unflatten_tree(unittest_data, NULL, &unittest_data_node);
 924         if (!unittest_data_node) {
 925                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
 926                 return -ENODATA;
 927         }
 928         of_node_set_flag(unittest_data_node, OF_DETACHED);
 929         rc = of_resolve_phandles(unittest_data_node);
 930         if (rc) {
 931                 pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
 932                 return -EINVAL;
 933         }
 934
 935         if (!of_root) {
 936                 of_root = unittest_data_node;
 937                 for_each_of_allnodes(np)
 938                         __of_attach_node_sysfs(np);
 939                 of_aliases = of_find_node_by_path("/aliases");
 940                 of_chosen = of_find_node_by_path("/chosen");
 941                 return 0;
 942         }
 943
 944         /* attach the sub-tree to live tree */
 945         np = unittest_data_node->child;
 946         while (np) {
 947                 struct device_node *next = np->sibling;
 948
 949                 np->parent = of_root;
 950                 attach_node_and_children(np);
 951                 np = next;
 952         }
 953         return 0;
 954 }
 955
 956 #ifdef CONFIG_OF_OVERLAY
 957
 958 static int unittest_probe(struct platform_device *pdev)
 959 {
 960         struct device *dev = &pdev->dev;
 961         struct device_node *np = dev->of_node;
 962
 963         if (np == NULL) {
 964                 dev_err(dev, "No OF data for device\n");
 965                 return -EINVAL;
 966
 967         }
 968
 969         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 970
 971         of_platform_populate(np, NULL, NULL, &pdev->dev);
 972
 973         return 0;
 974 }
 975
 976 static int unittest_remove(struct platform_device *pdev)
 977 {
 978         struct device *dev = &pdev->dev;
 979         struct device_node *np = dev->of_node;
 980
 981         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 982         return 0;
 983 }
 984
 985 static const struct of_device_id unittest_match[] = {
 986         { .compatible = "unittest", },
 987         {},
 988 };
 989
 990 static struct platform_driver unittest_driver = {
 991         .probe                  = unittest_probe,
 992         .remove                 = unittest_remove,
 993         .driver = {
 994                 .name           = "unittest",
 995                 .of_match_table = of_match_ptr(unittest_match),
 996         },
 997 };
 998
 999 /* get the platform device instantiated at the path */
1000 static struct platform_device *of_path_to_platform_device(const char *path)
1001 {
1002         struct device_node *np;
1003         struct platform_device *pdev;
1004
1005         np = of_find_node_by_path(path);
1006         if (np == NULL)
1007                 return NULL;
1008
1009         pdev = of_find_device_by_node(np);
1010         of_node_put(np);
1011
1012         return pdev;
1013 }
1014
1015 /* find out if a platform device exists at that path */
1016 static int of_path_platform_device_exists(const char *path)
1017 {
1018         struct platform_device *pdev;
1019
1020         pdev = of_path_to_platform_device(path);
1021         platform_device_put(pdev);
1022         return pdev != NULL;
1023 }
1024
1025 #if IS_BUILTIN(CONFIG_I2C)
1026
1027 /* get the i2c client device instantiated at the path */
1028 static struct i2c_client *of_path_to_i2c_client(const char *path)
1029 {
1030         struct device_node *np;
1031         struct i2c_client *client;
1032
1033         np = of_find_node_by_path(path);
1034         if (np == NULL)
1035                 return NULL;
1036
1037         client = of_find_i2c_device_by_node(np);
1038         of_node_put(np);
1039
1040         return client;
1041 }
1042
1043 /* find out if a i2c client device exists at that path */
1044 static int of_path_i2c_client_exists(const char *path)
1045 {
1046         struct i2c_client *client;
1047
1048         client = of_path_to_i2c_client(path);
1049         if (client)
1050                 put_device(&client->dev);
1051         return client != NULL;
1052 }
1053 #else
1054 static int of_path_i2c_client_exists(const char *path)
1055 {
1056         return 0;
1057 }
1058 #endif
1059
1060 enum overlay_type {
1061         PDEV_OVERLAY,
1062         I2C_OVERLAY
1063 };
1064
1065 static int of_path_device_type_exists(const char *path,
1066                 enum overlay_type ovtype)
1067 {
1068         switch (ovtype) {
1069         case PDEV_OVERLAY:
1070                 return of_path_platform_device_exists(path);
1071         case I2C_OVERLAY:
1072                 return of_path_i2c_client_exists(path);
1073         }
1074         return 0;
1075 }
1076
1077 static const char *unittest_path(int nr, enum overlay_type ovtype)
1078 {
1079         const char *base;
1080         static char buf[256];
1081
1082         switch (ovtype) {
1083         case PDEV_OVERLAY:
1084                 base = "/testcase-data/overlay-node/test-bus";
1085                 break;
1086         case I2C_OVERLAY:
1087                 base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
1088                 break;
1089         default:
1090                 buf[0] = '\0';
1091                 return buf;
1092         }
1093         snprintf(buf, sizeof(buf) - 1, "%s/test-unittest%d", base, nr);
1094         buf[sizeof(buf) - 1] = '\0';
1095         return buf;
1096 }
1097
1098 static int of_unittest_device_exists(int unittest_nr, enum overlay_type ovtype)
1099 {
1100         const char *path;
1101
1102         path = unittest_path(unittest_nr, ovtype);
1103
1104         switch (ovtype) {
1105         case PDEV_OVERLAY:
1106                 return of_path_platform_device_exists(path);
1107         case I2C_OVERLAY:
1108                 return of_path_i2c_client_exists(path);
1109         }
1110         return 0;
1111 }
1112
1113 static const char *overlay_path(int nr)
1114 {
1115         static char buf[256];
1116
1117         snprintf(buf, sizeof(buf) - 1,
1118                 "/testcase-data/overlay%d", nr);
1119         buf[sizeof(buf) - 1] = '\0';
1120
1121         return buf;
1122 }
1123
1124 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
1125
1126 /* it is guaranteed that overlay ids are assigned in sequence */
1127 #define MAX_UNITTEST_OVERLAYS   256
1128 static unsigned long overlay_id_bits[BITS_TO_LONGS(MAX_UNITTEST_OVERLAYS)];
1129 static int overlay_first_id = -1;
1130
1131 static void of_unittest_track_overlay(int id)
1132 {
1133         if (overlay_first_id < 0)
1134                 overlay_first_id = id;
1135         id -= overlay_first_id;
1136
1137         /* we shouldn't need that many */
1138         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1139         overlay_id_bits[BIT_WORD(id)] |= BIT_MASK(id);
1140 }
1141
1142 static void of_unittest_untrack_overlay(int id)
1143 {
1144         if (overlay_first_id < 0)
1145                 return;
1146         id -= overlay_first_id;
1147         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1148         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1149 }
1150
1151 static void of_unittest_destroy_tracked_overlays(void)
1152 {
1153         int id, ret, defers;
1154
1155         if (overlay_first_id < 0)
1156                 return;
1157
1158         /* try until no defers */
1159         do {
1160                 defers = 0;
1161                 /* remove in reverse order */
1162                 for (id = MAX_UNITTEST_OVERLAYS - 1; id >= 0; id--) {
1163                         if (!(overlay_id_bits[BIT_WORD(id)] & BIT_MASK(id)))
1164                                 continue;
1165
1166                         ret = of_overlay_destroy(id + overlay_first_id);
1167                         if (ret == -ENODEV) {
1168                                 pr_warn("%s: no overlay to destroy for #%d\n",
1169                                         __func__, id + overlay_first_id);
1170                                 continue;
1171                         }
1172                         if (ret != 0) {
1173                                 defers++;
1174                                 pr_warn("%s: overlay destroy failed for #%d\n",
1175                                         __func__, id + overlay_first_id);
1176                                 continue;
1177                         }
1178
1179                         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1180                 }
1181         } while (defers > 0);
1182 }
1183
1184 static int of_unittest_apply_overlay(int unittest_nr, int overlay_nr,
1185                 int *overlay_id)
1186 {
1187         struct device_node *np = NULL;
1188         int ret, id = -1;
1189
1190         np = of_find_node_by_path(overlay_path(overlay_nr));
1191         if (np == NULL) {
1192                 unittest(0, "could not find overlay node @\"%s\"\n",
1193                                 overlay_path(overlay_nr));
1194                 ret = -EINVAL;
1195                 goto out;
1196         }
1197
1198         ret = of_overlay_create(np);
1199         if (ret < 0) {
1200                 unittest(0, "could not create overlay from \"%s\"\n",
1201                                 overlay_path(overlay_nr));
1202                 goto out;
1203         }
1204         id = ret;
1205         of_unittest_track_overlay(id);
1206
1207         ret = 0;
1208
1209 out:
1210         of_node_put(np);
1211
1212         if (overlay_id)
1213                 *overlay_id = id;
1214
1215         return ret;
1216 }
1217
1218 /* apply an overlay while checking before and after states */
1219 static int of_unittest_apply_overlay_check(int overlay_nr, int unittest_nr,
1220                 int before, int after, enum overlay_type ovtype)
1221 {
1222         int ret;
1223
1224         /* unittest device must not be in before state */
1225         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1226                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1227                                 overlay_path(overlay_nr),
1228                                 unittest_path(unittest_nr, ovtype),
1229                                 !before ? "enabled" : "disabled");
1230                 return -EINVAL;
1231         }
1232
1233         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, NULL);
1234         if (ret != 0) {
1235                 /* of_unittest_apply_overlay already called unittest() */
1236                 return ret;
1237         }
1238
1239         /* unittest device must be to set to after state */
1240         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1241                 unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1242                                 overlay_path(overlay_nr),
1243                                 unittest_path(unittest_nr, ovtype),
1244                                 !after ? "enabled" : "disabled");
1245                 return -EINVAL;
1246         }
1247
1248         return 0;
1249 }
1250
1251 /* apply an overlay and then revert it while checking before, after states */
1252 static int of_unittest_apply_revert_overlay_check(int overlay_nr,
1253                 int unittest_nr, int before, int after,
1254                 enum overlay_type ovtype)
1255 {
1256         int ret, ov_id;
1257
1258         /* unittest device must be in before state */
1259         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1260                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1261                                 overlay_path(overlay_nr),
1262                                 unittest_path(unittest_nr, ovtype),
1263                                 !before ? "enabled" : "disabled");
1264                 return -EINVAL;
1265         }
1266
1267         /* apply the overlay */
1268         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, &ov_id);
1269         if (ret != 0) {
1270                 /* of_unittest_apply_overlay already called unittest() */
1271                 return ret;
1272         }
1273
1274         /* unittest device must be in after state */
1275         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1276                 unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1277                                 overlay_path(overlay_nr),
1278                                 unittest_path(unittest_nr, ovtype),
1279                                 !after ? "enabled" : "disabled");
1280                 return -EINVAL;
1281         }
1282
1283         ret = of_overlay_destroy(ov_id);
1284         if (ret != 0) {
1285                 unittest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
1286                                 overlay_path(overlay_nr),
1287                                 unittest_path(unittest_nr, ovtype));
1288                 return ret;
1289         }
1290
1291         /* unittest device must be again in before state */
1292         if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) {
1293                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1294                                 overlay_path(overlay_nr),
1295                                 unittest_path(unittest_nr, ovtype),
1296                                 !before ? "enabled" : "disabled");
1297                 return -EINVAL;
1298         }
1299
1300         return 0;
1301 }
1302
1303 /* test activation of device */
1304 static void of_unittest_overlay_0(void)
1305 {
1306         int ret;
1307
1308         /* device should enable */
1309         ret = of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
1310         if (ret != 0)
1311                 return;
1312
1313         unittest(1, "overlay test %d passed\n", 0);
1314 }
1315
1316 /* test deactivation of device */
1317 static void of_unittest_overlay_1(void)
1318 {
1319         int ret;
1320
1321         /* device should disable */
1322         ret = of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
1323         if (ret != 0)
1324                 return;
1325
1326         unittest(1, "overlay test %d passed\n", 1);
1327 }
1328
1329 /* test activation of device */
1330 static void of_unittest_overlay_2(void)
1331 {
1332         int ret;
1333
1334         /* device should enable */
1335         ret = of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
1336         if (ret != 0)
1337                 return;
1338
1339         unittest(1, "overlay test %d passed\n", 2);
1340 }
1341
1342 /* test deactivation of device */
1343 static void of_unittest_overlay_3(void)
1344 {
1345         int ret;
1346
1347         /* device should disable */
1348         ret = of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
1349         if (ret != 0)
1350                 return;
1351
1352         unittest(1, "overlay test %d passed\n", 3);
1353 }
1354
1355 /* test activation of a full device node */
1356 static void of_unittest_overlay_4(void)
1357 {
1358         int ret;
1359
1360         /* device should disable */
1361         ret = of_unittest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY);
1362         if (ret != 0)
1363                 return;
1364
1365         unittest(1, "overlay test %d passed\n", 4);
1366 }
1367
1368 /* test overlay apply/revert sequence */
1369 static void of_unittest_overlay_5(void)
1370 {
1371         int ret;
1372
1373         /* device should disable */
1374         ret = of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
1375         if (ret != 0)
1376                 return;
1377
1378         unittest(1, "overlay test %d passed\n", 5);
1379 }
1380
1381 /* test overlay application in sequence */
1382 static void of_unittest_overlay_6(void)
1383 {
1384         struct device_node *np;
1385         int ret, i, ov_id[2];
1386         int overlay_nr = 6, unittest_nr = 6;
1387         int before = 0, after = 1;
1388
1389         /* unittest device must be in before state */
1390         for (i = 0; i < 2; i++) {
1391                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1392                                 != before) {
1393                         unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1394                                         overlay_path(overlay_nr + i),
1395                                         unittest_path(unittest_nr + i,
1396                                                 PDEV_OVERLAY),
1397                                         !before ? "enabled" : "disabled");
1398                         return;
1399                 }
1400         }
1401
1402         /* apply the overlays */
1403         for (i = 0; i < 2; i++) {
1404
1405                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1406                 if (np == NULL) {
1407                         unittest(0, "could not find overlay node @\"%s\"\n",
1408                                         overlay_path(overlay_nr + i));
1409                         return;
1410                 }
1411
1412                 ret = of_overlay_create(np);
1413                 if (ret < 0)  {
1414                         unittest(0, "could not create overlay from \"%s\"\n",
1415                                         overlay_path(overlay_nr + i));
1416                         return;
1417                 }
1418                 ov_id[i] = ret;
1419                 of_unittest_track_overlay(ov_id[i]);
1420         }
1421
1422         for (i = 0; i < 2; i++) {
1423                 /* unittest device must be in after state */
1424                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1425                                 != after) {
1426                         unittest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
1427                                         overlay_path(overlay_nr + i),
1428                                         unittest_path(unittest_nr + i,
1429                                                 PDEV_OVERLAY),
1430                                         !after ? "enabled" : "disabled");
1431                         return;
1432                 }
1433         }
1434
1435         for (i = 1; i >= 0; i--) {
1436                 ret = of_overlay_destroy(ov_id[i]);
1437                 if (ret != 0) {
1438                         unittest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
1439                                         overlay_path(overlay_nr + i),
1440                                         unittest_path(unittest_nr + i,
1441                                                 PDEV_OVERLAY));
1442                         return;
1443                 }
1444                 of_unittest_untrack_overlay(ov_id[i]);
1445         }
1446
1447         for (i = 0; i < 2; i++) {
1448                 /* unittest device must be again in before state */
1449                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1450                                 != before) {
1451                         unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1452                                         overlay_path(overlay_nr + i),
1453                                         unittest_path(unittest_nr + i,
1454                                                 PDEV_OVERLAY),
1455                                         !before ? "enabled" : "disabled");
1456                         return;
1457                 }
1458         }
1459
1460         unittest(1, "overlay test %d passed\n", 6);
1461 }
1462
1463 /* test overlay application in sequence */
1464 static void of_unittest_overlay_8(void)
1465 {
1466         struct device_node *np;
1467         int ret, i, ov_id[2];
1468         int overlay_nr = 8, unittest_nr = 8;
1469
1470         /* we don't care about device state in this test */
1471
1472         /* apply the overlays */
1473         for (i = 0; i < 2; i++) {
1474
1475                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1476                 if (np == NULL) {
1477                         unittest(0, "could not find overlay node @\"%s\"\n",
1478                                         overlay_path(overlay_nr + i));
1479                         return;
1480                 }
1481
1482                 ret = of_overlay_create(np);
1483                 if (ret < 0)  {
1484                         unittest(0, "could not create overlay from \"%s\"\n",
1485                                         overlay_path(overlay_nr + i));
1486                         return;
1487                 }
1488                 ov_id[i] = ret;
1489                 of_unittest_track_overlay(ov_id[i]);
1490         }
1491
1492         /* now try to remove first overlay (it should fail) */
1493         ret = of_overlay_destroy(ov_id[0]);
1494         if (ret == 0) {
1495                 unittest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
1496                                 overlay_path(overlay_nr + 0),
1497                                 unittest_path(unittest_nr,
1498                                         PDEV_OVERLAY));
1499                 return;
1500         }
1501
1502         /* removing them in order should work */
1503         for (i = 1; i >= 0; i--) {
1504                 ret = of_overlay_destroy(ov_id[i]);
1505                 if (ret != 0) {
1506                         unittest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
1507                                         overlay_path(overlay_nr + i),
1508                                         unittest_path(unittest_nr,
1509                                                 PDEV_OVERLAY));
1510                         return;
1511                 }
1512                 of_unittest_untrack_overlay(ov_id[i]);
1513         }
1514
1515         unittest(1, "overlay test %d passed\n", 8);
1516 }
1517
1518 /* test insertion of a bus with parent devices */
1519 static void of_unittest_overlay_10(void)
1520 {
1521         int ret;
1522         char *child_path;
1523
1524         /* device should disable */
1525         ret = of_unittest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
1526         if (unittest(ret == 0,
1527                         "overlay test %d failed; overlay application\n", 10))
1528                 return;
1529
1530         child_path = kasprintf(GFP_KERNEL, "%s/test-unittest101",
1531                         unittest_path(10, PDEV_OVERLAY));
1532         if (unittest(child_path, "overlay test %d failed; kasprintf\n", 10))
1533                 return;
1534
1535         ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
1536         kfree(child_path);
1537         if (unittest(ret, "overlay test %d failed; no child device\n", 10))
1538                 return;
1539 }
1540
1541 /* test insertion of a bus with parent devices (and revert) */
1542 static void of_unittest_overlay_11(void)
1543 {
1544         int ret;
1545
1546         /* device should disable */
1547         ret = of_unittest_apply_revert_overlay_check(11, 11, 0, 1,
1548                         PDEV_OVERLAY);
1549         if (unittest(ret == 0,
1550                         "overlay test %d failed; overlay application\n", 11))
1551                 return;
1552 }
1553
1554 #if IS_BUILTIN(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
1555
1556 struct unittest_i2c_bus_data {
1557         struct platform_device  *pdev;
1558         struct i2c_adapter      adap;
1559 };
1560
1561 static int unittest_i2c_master_xfer(struct i2c_adapter *adap,
1562                 struct i2c_msg *msgs, int num)
1563 {
1564         struct unittest_i2c_bus_data *std = i2c_get_adapdata(adap);
1565
1566         (void)std;
1567
1568         return num;
1569 }
1570
1571 static u32 unittest_i2c_functionality(struct i2c_adapter *adap)
1572 {
1573         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
1574 }
1575
1576 static const struct i2c_algorithm unittest_i2c_algo = {
1577         .master_xfer    = unittest_i2c_master_xfer,
1578         .functionality  = unittest_i2c_functionality,
1579 };
1580
1581 static int unittest_i2c_bus_probe(struct platform_device *pdev)
1582 {
1583         struct device *dev = &pdev->dev;
1584         struct device_node *np = dev->of_node;
1585         struct unittest_i2c_bus_data *std;
1586         struct i2c_adapter *adap;
1587         int ret;
1588
1589         if (np == NULL) {
1590                 dev_err(dev, "No OF data for device\n");
1591                 return -EINVAL;
1592
1593         }
1594
1595         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1596
1597         std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
1598         if (!std) {
1599                 dev_err(dev, "Failed to allocate unittest i2c data\n");
1600                 return -ENOMEM;
1601         }
1602
1603         /* link them together */
1604         std->pdev = pdev;
1605         platform_set_drvdata(pdev, std);
1606
1607         adap = &std->adap;
1608         i2c_set_adapdata(adap, std);
1609         adap->nr = -1;
1610         strlcpy(adap->name, pdev->name, sizeof(adap->name));
1611         adap->class = I2C_CLASS_DEPRECATED;
1612         adap->algo = &unittest_i2c_algo;
1613         adap->dev.parent = dev;
1614         adap->dev.of_node = dev->of_node;
1615         adap->timeout = 5 * HZ;
1616         adap->retries = 3;
1617
1618         ret = i2c_add_numbered_adapter(adap);
1619         if (ret != 0) {
1620                 dev_err(dev, "Failed to add I2C adapter\n");
1621                 return ret;
1622         }
1623
1624         return 0;
1625 }
1626
1627 static int unittest_i2c_bus_remove(struct platform_device *pdev)
1628 {
1629         struct device *dev = &pdev->dev;
1630         struct device_node *np = dev->of_node;
1631         struct unittest_i2c_bus_data *std = platform_get_drvdata(pdev);
1632
1633         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1634         i2c_del_adapter(&std->adap);
1635
1636         return 0;
1637 }
1638
1639 static const struct of_device_id unittest_i2c_bus_match[] = {
1640         { .compatible = "unittest-i2c-bus", },
1641         {},
1642 };
1643
1644 static struct platform_driver unittest_i2c_bus_driver = {
1645         .probe                  = unittest_i2c_bus_probe,
1646         .remove                 = unittest_i2c_bus_remove,
1647         .driver = {
1648                 .name           = "unittest-i2c-bus",
1649                 .of_match_table = of_match_ptr(unittest_i2c_bus_match),
1650         },
1651 };
1652
1653 static int unittest_i2c_dev_probe(struct i2c_client *client,
1654                 const struct i2c_device_id *id)
1655 {
1656         struct device *dev = &client->dev;
1657         struct device_node *np = client->dev.of_node;
1658
1659         if (!np) {
1660                 dev_err(dev, "No OF node\n");
1661                 return -EINVAL;
1662         }
1663
1664         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1665
1666         return 0;
1667 };
1668
1669 static int unittest_i2c_dev_remove(struct i2c_client *client)
1670 {
1671         struct device *dev = &client->dev;
1672         struct device_node *np = client->dev.of_node;
1673
1674         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1675         return 0;
1676 }
1677
1678 static const struct i2c_device_id unittest_i2c_dev_id[] = {
1679         { .name = "unittest-i2c-dev" },
1680         { }
1681 };
1682
1683 static struct i2c_driver unittest_i2c_dev_driver = {
1684         .driver = {
1685                 .name = "unittest-i2c-dev",
1686         },
1687         .probe = unittest_i2c_dev_probe,
1688         .remove = unittest_i2c_dev_remove,
1689         .id_table = unittest_i2c_dev_id,
1690 };
1691
1692 #if IS_BUILTIN(CONFIG_I2C_MUX)
1693
1694 static int unittest_i2c_mux_select_chan(struct i2c_mux_core *muxc, u32 chan)
1695 {
1696         return 0;
1697 }
1698
1699 static int unittest_i2c_mux_probe(struct i2c_client *client,
1700                 const struct i2c_device_id *id)
1701 {
1702         int ret, i, nchans;
1703         struct device *dev = &client->dev;
1704         struct i2c_adapter *adap = to_i2c_adapter(dev->parent);
1705         struct device_node *np = client->dev.of_node, *child;
1706         struct i2c_mux_core *muxc;
1707         u32 reg, max_reg;
1708
1709         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1710
1711         if (!np) {
1712                 dev_err(dev, "No OF node\n");
1713                 return -EINVAL;
1714         }
1715
1716         max_reg = (u32)-1;
1717         for_each_child_of_node(np, child) {
1718                 ret = of_property_read_u32(child, "reg", &reg);
1719                 if (ret)
1720                         continue;
1721                 if (max_reg == (u32)-1 || reg > max_reg)
1722                         max_reg = reg;
1723         }
1724         nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
1725         if (nchans == 0) {
1726                 dev_err(dev, "No channels\n");
1727                 return -EINVAL;
1728         }
1729
1730         muxc = i2c_mux_alloc(adap, dev, nchans, 0, 0,
1731                              unittest_i2c_mux_select_chan, NULL);
1732         if (!muxc)
1733                 return -ENOMEM;
1734         for (i = 0; i < nchans; i++) {
1735                 ret = i2c_mux_add_adapter(muxc, 0, i, 0);
1736                 if (ret) {
1737                         dev_err(dev, "Failed to register mux #%d\n", i);
1738                         i2c_mux_del_adapters(muxc);
1739                         return -ENODEV;
1740                 }
1741         }
1742
1743         i2c_set_clientdata(client, muxc);
1744
1745         return 0;
1746 };
1747
1748 static int unittest_i2c_mux_remove(struct i2c_client *client)
1749 {
1750         struct device *dev = &client->dev;
1751         struct device_node *np = client->dev.of_node;
1752         struct i2c_mux_core *muxc = i2c_get_clientdata(client);
1753
1754         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1755         i2c_mux_del_adapters(muxc);
1756         return 0;
1757 }
1758
1759 static const struct i2c_device_id unittest_i2c_mux_id[] = {
1760         { .name = "unittest-i2c-mux" },
1761         { }
1762 };
1763
1764 static struct i2c_driver unittest_i2c_mux_driver = {
1765         .driver = {
1766                 .name = "unittest-i2c-mux",
1767         },
1768         .probe = unittest_i2c_mux_probe,
1769         .remove = unittest_i2c_mux_remove,
1770         .id_table = unittest_i2c_mux_id,
1771 };
1772
1773 #endif
1774
1775 static int of_unittest_overlay_i2c_init(void)
1776 {
1777         int ret;
1778
1779         ret = i2c_add_driver(&unittest_i2c_dev_driver);
1780         if (unittest(ret == 0,
1781                         "could not register unittest i2c device driver\n"))
1782                 return ret;
1783
1784         ret = platform_driver_register(&unittest_i2c_bus_driver);
1785         if (unittest(ret == 0,
1786                         "could not register unittest i2c bus driver\n"))
1787                 return ret;
1788
1789 #if IS_BUILTIN(CONFIG_I2C_MUX)
1790         ret = i2c_add_driver(&unittest_i2c_mux_driver);
1791         if (unittest(ret == 0,
1792                         "could not register unittest i2c mux driver\n"))
1793                 return ret;
1794 #endif
1795
1796         return 0;
1797 }
1798
1799 static void of_unittest_overlay_i2c_cleanup(void)
1800 {
1801 #if IS_BUILTIN(CONFIG_I2C_MUX)
1802         i2c_del_driver(&unittest_i2c_mux_driver);
1803 #endif
1804         platform_driver_unregister(&unittest_i2c_bus_driver);
1805         i2c_del_driver(&unittest_i2c_dev_driver);
1806 }
1807
1808 static void of_unittest_overlay_i2c_12(void)
1809 {
1810         int ret;
1811
1812         /* device should enable */
1813         ret = of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
1814         if (ret != 0)
1815                 return;
1816
1817         unittest(1, "overlay test %d passed\n", 12);
1818 }
1819
1820 /* test deactivation of device */
1821 static void of_unittest_overlay_i2c_13(void)
1822 {
1823         int ret;
1824
1825         /* device should disable */
1826         ret = of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
1827         if (ret != 0)
1828                 return;
1829
1830         unittest(1, "overlay test %d passed\n", 13);
1831 }
1832
1833 /* just check for i2c mux existence */
1834 static void of_unittest_overlay_i2c_14(void)
1835 {
1836 }
1837
1838 static void of_unittest_overlay_i2c_15(void)
1839 {
1840         int ret;
1841
1842         /* device should enable */
1843         ret = of_unittest_apply_overlay_check(16, 15, 0, 1, I2C_OVERLAY);
1844         if (ret != 0)
1845                 return;
1846
1847         unittest(1, "overlay test %d passed\n", 15);
1848 }
1849
1850 #else
1851
1852 static inline void of_unittest_overlay_i2c_14(void) { }
1853 static inline void of_unittest_overlay_i2c_15(void) { }
1854
1855 #endif
1856
1857 static void __init of_unittest_overlay(void)
1858 {
1859         struct device_node *bus_np = NULL;
1860         int ret;
1861
1862         ret = platform_driver_register(&unittest_driver);
1863         if (ret != 0) {
1864                 unittest(0, "could not register unittest driver\n");
1865                 goto out;
1866         }
1867
1868         bus_np = of_find_node_by_path(bus_path);
1869         if (bus_np == NULL) {
1870                 unittest(0, "could not find bus_path \"%s\"\n", bus_path);
1871                 goto out;
1872         }
1873
1874         ret = of_platform_default_populate(bus_np, NULL, NULL);
1875         if (ret != 0) {
1876                 unittest(0, "could not populate bus @ \"%s\"\n", bus_path);
1877                 goto out;
1878         }
1879
1880         if (!of_unittest_device_exists(100, PDEV_OVERLAY)) {
1881                 unittest(0, "could not find unittest0 @ \"%s\"\n",
1882                                 unittest_path(100, PDEV_OVERLAY));
1883                 goto out;
1884         }
1885
1886         if (of_unittest_device_exists(101, PDEV_OVERLAY)) {
1887                 unittest(0, "unittest1 @ \"%s\" should not exist\n",
1888                                 unittest_path(101, PDEV_OVERLAY));
1889                 goto out;
1890         }
1891
1892         unittest(1, "basic infrastructure of overlays passed");
1893
1894         /* tests in sequence */
1895         of_unittest_overlay_0();
1896         of_unittest_overlay_1();
1897         of_unittest_overlay_2();
1898         of_unittest_overlay_3();
1899         of_unittest_overlay_4();
1900         of_unittest_overlay_5();
1901         of_unittest_overlay_6();
1902         of_unittest_overlay_8();
1903
1904         of_unittest_overlay_10();
1905         of_unittest_overlay_11();
1906
1907 #if IS_BUILTIN(CONFIG_I2C)
1908         if (unittest(of_unittest_overlay_i2c_init() == 0, "i2c init failed\n"))
1909                 goto out;
1910
1911         of_unittest_overlay_i2c_12();
1912         of_unittest_overlay_i2c_13();
1913         of_unittest_overlay_i2c_14();
1914         of_unittest_overlay_i2c_15();
1915
1916         of_unittest_overlay_i2c_cleanup();
1917 #endif
1918
1919         of_unittest_destroy_tracked_overlays();
1920
1921 out:
1922         of_node_put(bus_np);
1923 }
1924
1925 #else
1926 static inline void __init of_unittest_overlay(void) { }
1927 #endif
1928
1929 static int __init of_unittest(void)
1930 {
1931         struct device_node *np;
1932         int res;
1933
1934         /* adding data for unittest */
1935         res = unittest_data_add();
1936         if (res)
1937                 return res;
1938         if (!of_aliases)
1939                 of_aliases = of_find_node_by_path("/aliases");
1940
1941         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
1942         if (!np) {
1943                 pr_info("No testcase data in device tree; not running tests\n");
1944                 return 0;
1945         }
1946         of_node_put(np);
1947
1948         pr_info("start of unittest - you will see error messages\n");
1949         of_unittest_check_tree_linkage();
1950         of_unittest_check_phandles();
1951         of_unittest_find_node_by_name();
1952         of_unittest_dynamic();
1953         of_unittest_parse_phandle_with_args();
1954         of_unittest_property_string();
1955         of_unittest_property_copy();
1956         of_unittest_changeset();
1957         of_unittest_parse_interrupts();
1958         of_unittest_parse_interrupts_extended();
1959         of_unittest_match_node();
1960         of_unittest_platform_populate();
1961         of_unittest_overlay();
1962
1963         /* Double check linkage after removing testcase data */
1964         of_unittest_check_tree_linkage();
1965
1966         pr_info("end of unittest - %i passed, %i failed\n",
1967                 unittest_results.passed, unittest_results.failed);
1968
1969         return 0;
1970 }
1971 late_initcall(of_unittest);