kernel/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/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_fdt.h>
  14 #include <linux/of_irq.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/list.h>
  17 #include <linux/mutex.h>
  18 #include <linux/slab.h>
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/of_platform.h>
  22
  23 #include <linux/i2c.h>
  24 #include <linux/i2c-mux.h>
  25
  26 #include <linux/bitops.h>
  27
  28 #include "of_private.h"
  29
  30 static struct unittest_results {
  31         int passed;
  32         int failed;
  33 } unittest_results;
  34
  35 #define unittest(result, fmt, ...) ({ \
  36         bool failed = !(result); \
  37         if (failed) { \
  38                 unittest_results.failed++; \
  39                 pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
  40         } else { \
  41                 unittest_results.passed++; \
  42                 pr_debug("pass %s():%i\n", __func__, __LINE__); \
  43         } \
  44         failed; \
  45 })
  46
  47 static void __init of_unittest_find_node_by_name(void)
  48 {
  49         struct device_node *np;
  50         const char *options;
  51
  52         np = of_find_node_by_path("/testcase-data");
  53         unittest(np && !strcmp("/testcase-data", np->full_name),
  54                 "find /testcase-data failed\n");
  55         of_node_put(np);
  56
  57         /* Test if trailing '/' works */
  58         np = of_find_node_by_path("/testcase-data/");
  59         unittest(!np, "trailing '/' on /testcase-data/ should fail\n");
  60
  61         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
  62         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  63                 "find /testcase-data/phandle-tests/consumer-a failed\n");
  64         of_node_put(np);
  65
  66         np = of_find_node_by_path("testcase-alias");
  67         unittest(np && !strcmp("/testcase-data", np->full_name),
  68                 "find testcase-alias failed\n");
  69         of_node_put(np);
  70
  71         /* Test if trailing '/' works on aliases */
  72         np = of_find_node_by_path("testcase-alias/");
  73         unittest(!np, "trailing '/' on testcase-alias/ should fail\n");
  74
  75         np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
  76         unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
  77                 "find testcase-alias/phandle-tests/consumer-a failed\n");
  78         of_node_put(np);
  79
  80         np = of_find_node_by_path("/testcase-data/missing-path");
  81         unittest(!np, "non-existent path returned node %s\n", np->full_name);
  82         of_node_put(np);
  83
  84         np = of_find_node_by_path("missing-alias");
  85         unittest(!np, "non-existent alias returned node %s\n", np->full_name);
  86         of_node_put(np);
  87
  88         np = of_find_node_by_path("testcase-alias/missing-path");
  89         unittest(!np, "non-existent alias with relative path returned node %s\n", np->full_name);
  90         of_node_put(np);
  91
  92         np = of_find_node_opts_by_path("/testcase-data:testoption", &options);
  93         unittest(np && !strcmp("testoption", options),
  94                  "option path test failed\n");
  95         of_node_put(np);
  96
  97         np = of_find_node_opts_by_path("/testcase-data:test/option", &options);
  98         unittest(np && !strcmp("test/option", options),
  99                  "option path test, subcase #1 failed\n");
 100         of_node_put(np);
 101
 102         np = of_find_node_opts_by_path("/testcase-data/testcase-device1:test/option", &options);
 103         unittest(np && !strcmp("test/option", options),
 104                  "option path test, subcase #2 failed\n");
 105         of_node_put(np);
 106
 107         np = of_find_node_opts_by_path("/testcase-data:testoption", NULL);
 108         unittest(np, "NULL option path test failed\n");
 109         of_node_put(np);
 110
 111         np = of_find_node_opts_by_path("testcase-alias:testaliasoption",
 112                                        &options);
 113         unittest(np && !strcmp("testaliasoption", options),
 114                  "option alias path test failed\n");
 115         of_node_put(np);
 116
 117         np = of_find_node_opts_by_path("testcase-alias:test/alias/option",
 118                                        &options);
 119         unittest(np && !strcmp("test/alias/option", options),
 120                  "option alias path test, subcase #1 failed\n");
 121         of_node_put(np);
 122
 123         np = of_find_node_opts_by_path("testcase-alias:testaliasoption", NULL);
 124         unittest(np, "NULL option alias path test failed\n");
 125         of_node_put(np);
 126
 127         options = "testoption";
 128         np = of_find_node_opts_by_path("testcase-alias", &options);
 129         unittest(np && !options, "option clearing test failed\n");
 130         of_node_put(np);
 131
 132         options = "testoption";
 133         np = of_find_node_opts_by_path("/", &options);
 134         unittest(np && !options, "option clearing root node test failed\n");
 135         of_node_put(np);
 136 }
 137
 138 static void __init of_unittest_dynamic(void)
 139 {
 140         struct device_node *np;
 141         struct property *prop;
 142
 143         np = of_find_node_by_path("/testcase-data");
 144         if (!np) {
 145                 pr_err("missing testcase data\n");
 146                 return;
 147         }
 148
 149         /* Array of 4 properties for the purpose of testing */
 150         prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
 151         if (!prop) {
 152                 unittest(0, "kzalloc() failed\n");
 153                 return;
 154         }
 155
 156         /* Add a new property - should pass*/
 157         prop->name = "new-property";
 158         prop->value = "new-property-data";
 159         prop->length = strlen(prop->value);
 160         unittest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
 161
 162         /* Try to add an existing property - should fail */
 163         prop++;
 164         prop->name = "new-property";
 165         prop->value = "new-property-data-should-fail";
 166         prop->length = strlen(prop->value);
 167         unittest(of_add_property(np, prop) != 0,
 168                  "Adding an existing property should have failed\n");
 169
 170         /* Try to modify an existing property - should pass */
 171         prop->value = "modify-property-data-should-pass";
 172         prop->length = strlen(prop->value);
 173         unittest(of_update_property(np, prop) == 0,
 174                  "Updating an existing property should have passed\n");
 175
 176         /* Try to modify non-existent property - should pass*/
 177         prop++;
 178         prop->name = "modify-property";
 179         prop->value = "modify-missing-property-data-should-pass";
 180         prop->length = strlen(prop->value);
 181         unittest(of_update_property(np, prop) == 0,
 182                  "Updating a missing property should have passed\n");
 183
 184         /* Remove property - should pass */
 185         unittest(of_remove_property(np, prop) == 0,
 186                  "Removing a property should have passed\n");
 187
 188         /* Adding very large property - should pass */
 189         prop++;
 190         prop->name = "large-property-PAGE_SIZEx8";
 191         prop->length = PAGE_SIZE * 8;
 192         prop->value = kzalloc(prop->length, GFP_KERNEL);
 193         unittest(prop->value != NULL, "Unable to allocate large buffer\n");
 194         if (prop->value)
 195                 unittest(of_add_property(np, prop) == 0,
 196                          "Adding a large property should have passed\n");
 197 }
 198
 199 static int __init of_unittest_check_node_linkage(struct device_node *np)
 200 {
 201         struct device_node *child;
 202         int count = 0, rc;
 203
 204         for_each_child_of_node(np, child) {
 205                 if (child->parent != np) {
 206                         pr_err("Child node %s links to wrong parent %s\n",
 207                                  child->name, np->name);
 208                         return -EINVAL;
 209                 }
 210
 211                 rc = of_unittest_check_node_linkage(child);
 212                 if (rc < 0)
 213                         return rc;
 214                 count += rc;
 215         }
 216
 217         return count + 1;
 218 }
 219
 220 static void __init of_unittest_check_tree_linkage(void)
 221 {
 222         struct device_node *np;
 223         int allnode_count = 0, child_count;
 224
 225         if (!of_root)
 226                 return;
 227
 228         for_each_of_allnodes(np)
 229                 allnode_count++;
 230         child_count = of_unittest_check_node_linkage(of_root);
 231
 232         unittest(child_count > 0, "Device node data structure is corrupted\n");
 233         unittest(child_count == allnode_count,
 234                  "allnodes list size (%i) doesn't match sibling lists size (%i)\n",
 235                  allnode_count, child_count);
 236         pr_debug("allnodes list size (%i); sibling lists size (%i)\n", allnode_count, child_count);
 237 }
 238
 239 struct node_hash {
 240         struct hlist_node node;
 241         struct device_node *np;
 242 };
 243
 244 static DEFINE_HASHTABLE(phandle_ht, 8);
 245 static void __init of_unittest_check_phandles(void)
 246 {
 247         struct device_node *np;
 248         struct node_hash *nh;
 249         struct hlist_node *tmp;
 250         int i, dup_count = 0, phandle_count = 0;
 251
 252         for_each_of_allnodes(np) {
 253                 if (!np->phandle)
 254                         continue;
 255
 256                 hash_for_each_possible(phandle_ht, nh, node, np->phandle) {
 257                         if (nh->np->phandle == np->phandle) {
 258                                 pr_info("Duplicate phandle! %i used by %s and %s\n",
 259                                         np->phandle, nh->np->full_name, np->full_name);
 260                                 dup_count++;
 261                                 break;
 262                         }
 263                 }
 264
 265                 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
 266                 if (WARN_ON(!nh))
 267                         return;
 268
 269                 nh->np = np;
 270                 hash_add(phandle_ht, &nh->node, np->phandle);
 271                 phandle_count++;
 272         }
 273         unittest(dup_count == 0, "Found %i duplicates in %i phandles\n",
 274                  dup_count, phandle_count);
 275
 276         /* Clean up */
 277         hash_for_each_safe(phandle_ht, i, tmp, nh, node) {
 278                 hash_del(&nh->node);
 279                 kfree(nh);
 280         }
 281 }
 282
 283 static void __init of_unittest_parse_phandle_with_args(void)
 284 {
 285         struct device_node *np;
 286         struct of_phandle_args args;
 287         int i, rc;
 288
 289         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 290         if (!np) {
 291                 pr_err("missing testcase data\n");
 292                 return;
 293         }
 294
 295         rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
 296         unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
 297
 298         for (i = 0; i < 8; i++) {
 299                 bool passed = true;
 300
 301                 rc = of_parse_phandle_with_args(np, "phandle-list",
 302                                                 "#phandle-cells", i, &args);
 303
 304                 /* Test the values from tests-phandle.dtsi */
 305                 switch (i) {
 306                 case 0:
 307                         passed &= !rc;
 308                         passed &= (args.args_count == 1);
 309                         passed &= (args.args[0] == (i + 1));
 310                         break;
 311                 case 1:
 312                         passed &= !rc;
 313                         passed &= (args.args_count == 2);
 314                         passed &= (args.args[0] == (i + 1));
 315                         passed &= (args.args[1] == 0);
 316                         break;
 317                 case 2:
 318                         passed &= (rc == -ENOENT);
 319                         break;
 320                 case 3:
 321                         passed &= !rc;
 322                         passed &= (args.args_count == 3);
 323                         passed &= (args.args[0] == (i + 1));
 324                         passed &= (args.args[1] == 4);
 325                         passed &= (args.args[2] == 3);
 326                         break;
 327                 case 4:
 328                         passed &= !rc;
 329                         passed &= (args.args_count == 2);
 330                         passed &= (args.args[0] == (i + 1));
 331                         passed &= (args.args[1] == 100);
 332                         break;
 333                 case 5:
 334                         passed &= !rc;
 335                         passed &= (args.args_count == 0);
 336                         break;
 337                 case 6:
 338                         passed &= !rc;
 339                         passed &= (args.args_count == 1);
 340                         passed &= (args.args[0] == (i + 1));
 341                         break;
 342                 case 7:
 343                         passed &= (rc == -ENOENT);
 344                         break;
 345                 default:
 346                         passed = false;
 347                 }
 348
 349                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 350                          i, args.np->full_name, rc);
 351         }
 352
 353         /* Check for missing list property */
 354         rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 355                                         "#phandle-cells", 0, &args);
 356         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 357         rc = of_count_phandle_with_args(np, "phandle-list-missing",
 358                                         "#phandle-cells");
 359         unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 360
 361         /* Check for missing cells property */
 362         rc = of_parse_phandle_with_args(np, "phandle-list",
 363                                         "#phandle-cells-missing", 0, &args);
 364         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 365         rc = of_count_phandle_with_args(np, "phandle-list",
 366                                         "#phandle-cells-missing");
 367         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 368
 369         /* Check for bad phandle in list */
 370         rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 371                                         "#phandle-cells", 0, &args);
 372         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 373         rc = of_count_phandle_with_args(np, "phandle-list-bad-phandle",
 374                                         "#phandle-cells");
 375         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 376
 377         /* Check for incorrectly formed argument list */
 378         rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 379                                         "#phandle-cells", 1, &args);
 380         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 381         rc = of_count_phandle_with_args(np, "phandle-list-bad-args",
 382                                         "#phandle-cells");
 383         unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 384 }
 385
 386 static void __init of_unittest_property_string(void)
 387 {
 388         const char *strings[4];
 389         struct device_node *np;
 390         int rc;
 391
 392         np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 393         if (!np) {
 394                 pr_err("No testcase data in device tree\n");
 395                 return;
 396         }
 397
 398         rc = of_property_match_string(np, "phandle-list-names", "first");
 399         unittest(rc == 0, "first expected:0 got:%i\n", rc);
 400         rc = of_property_match_string(np, "phandle-list-names", "second");
 401         unittest(rc == 1, "second expected:1 got:%i\n", rc);
 402         rc = of_property_match_string(np, "phandle-list-names", "third");
 403         unittest(rc == 2, "third expected:2 got:%i\n", rc);
 404         rc = of_property_match_string(np, "phandle-list-names", "fourth");
 405         unittest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
 406         rc = of_property_match_string(np, "missing-property", "blah");
 407         unittest(rc == -EINVAL, "missing property; rc=%i\n", rc);
 408         rc = of_property_match_string(np, "empty-property", "blah");
 409         unittest(rc == -ENODATA, "empty property; rc=%i\n", rc);
 410         rc = of_property_match_string(np, "unterminated-string", "blah");
 411         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 412
 413         /* of_property_count_strings() tests */
 414         rc = of_property_count_strings(np, "string-property");
 415         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 416         rc = of_property_count_strings(np, "phandle-list-names");
 417         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 418         rc = of_property_count_strings(np, "unterminated-string");
 419         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 420         rc = of_property_count_strings(np, "unterminated-string-list");
 421         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 422
 423         /* of_property_read_string_index() tests */
 424         rc = of_property_read_string_index(np, "string-property", 0, strings);
 425         unittest(rc == 0 && !strcmp(strings[0], "foobar"), "of_property_read_string_index() failure; rc=%i\n", rc);
 426         strings[0] = NULL;
 427         rc = of_property_read_string_index(np, "string-property", 1, strings);
 428         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 429         rc = of_property_read_string_index(np, "phandle-list-names", 0, strings);
 430         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 431         rc = of_property_read_string_index(np, "phandle-list-names", 1, strings);
 432         unittest(rc == 0 && !strcmp(strings[0], "second"), "of_property_read_string_index() failure; rc=%i\n", rc);
 433         rc = of_property_read_string_index(np, "phandle-list-names", 2, strings);
 434         unittest(rc == 0 && !strcmp(strings[0], "third"), "of_property_read_string_index() failure; rc=%i\n", rc);
 435         strings[0] = NULL;
 436         rc = of_property_read_string_index(np, "phandle-list-names", 3, strings);
 437         unittest(rc == -ENODATA && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 438         strings[0] = NULL;
 439         rc = of_property_read_string_index(np, "unterminated-string", 0, strings);
 440         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 441         rc = of_property_read_string_index(np, "unterminated-string-list", 0, strings);
 442         unittest(rc == 0 && !strcmp(strings[0], "first"), "of_property_read_string_index() failure; rc=%i\n", rc);
 443         strings[0] = NULL;
 444         rc = of_property_read_string_index(np, "unterminated-string-list", 2, strings); /* should fail */
 445         unittest(rc == -EILSEQ && strings[0] == NULL, "of_property_read_string_index() failure; rc=%i\n", rc);
 446         strings[1] = NULL;
 447
 448         /* of_property_read_string_array() tests */
 449         rc = of_property_read_string_array(np, "string-property", strings, 4);
 450         unittest(rc == 1, "Incorrect string count; rc=%i\n", rc);
 451         rc = of_property_read_string_array(np, "phandle-list-names", strings, 4);
 452         unittest(rc == 3, "Incorrect string count; rc=%i\n", rc);
 453         rc = of_property_read_string_array(np, "unterminated-string", strings, 4);
 454         unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
 455         /* -- An incorrectly formed string should cause a failure */
 456         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 4);
 457         unittest(rc == -EILSEQ, "unterminated string array; rc=%i\n", rc);
 458         /* -- parsing the correctly formed strings should still work: */
 459         strings[2] = NULL;
 460         rc = of_property_read_string_array(np, "unterminated-string-list", strings, 2);
 461         unittest(rc == 2 && strings[2] == NULL, "of_property_read_string_array() failure; rc=%i\n", rc);
 462         strings[1] = NULL;
 463         rc = of_property_read_string_array(np, "phandle-list-names", strings, 1);
 464         unittest(rc == 1 && strings[1] == NULL, "Overwrote end of string array; rc=%i, str='%s'\n", rc, strings[1]);
 465 }
 466
 467 #define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
 468                         (p1)->value && (p2)->value && \
 469                         !memcmp((p1)->value, (p2)->value, (p1)->length) && \
 470                         !strcmp((p1)->name, (p2)->name))
 471 static void __init of_unittest_property_copy(void)
 472 {
 473 #ifdef CONFIG_OF_DYNAMIC
 474         struct property p1 = { .name = "p1", .length = 0, .value = "" };
 475         struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
 476         struct property *new;
 477
 478         new = __of_prop_dup(&p1, GFP_KERNEL);
 479         unittest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
 480         kfree(new->value);
 481         kfree(new->name);
 482         kfree(new);
 483
 484         new = __of_prop_dup(&p2, GFP_KERNEL);
 485         unittest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
 486         kfree(new->value);
 487         kfree(new->name);
 488         kfree(new);
 489 #endif
 490 }
 491
 492 static void __init of_unittest_changeset(void)
 493 {
 494 #ifdef CONFIG_OF_DYNAMIC
 495         struct property *ppadd, padd = { .name = "prop-add", .length = 0, .value = "" };
 496         struct property *ppupdate, pupdate = { .name = "prop-update", .length = 5, .value = "abcd" };
 497         struct property *ppremove;
 498         struct device_node *n1, *n2, *n21, *nremove, *parent, *np;
 499         struct of_changeset chgset;
 500
 501         n1 = __of_node_dup(NULL, "/testcase-data/changeset/n1");
 502         unittest(n1, "testcase setup failure\n");
 503         n2 = __of_node_dup(NULL, "/testcase-data/changeset/n2");
 504         unittest(n2, "testcase setup failure\n");
 505         n21 = __of_node_dup(NULL, "%s/%s", "/testcase-data/changeset/n2", "n21");
 506         unittest(n21, "testcase setup failure %p\n", n21);
 507         nremove = of_find_node_by_path("/testcase-data/changeset/node-remove");
 508         unittest(nremove, "testcase setup failure\n");
 509         ppadd = __of_prop_dup(&padd, GFP_KERNEL);
 510         unittest(ppadd, "testcase setup failure\n");
 511         ppupdate = __of_prop_dup(&pupdate, GFP_KERNEL);
 512         unittest(ppupdate, "testcase setup failure\n");
 513         parent = nremove->parent;
 514         n1->parent = parent;
 515         n2->parent = parent;
 516         n21->parent = n2;
 517         n2->child = n21;
 518         ppremove = of_find_property(parent, "prop-remove", NULL);
 519         unittest(ppremove, "failed to find removal prop");
 520
 521         of_changeset_init(&chgset);
 522         unittest(!of_changeset_attach_node(&chgset, n1), "fail attach n1\n");
 523         unittest(!of_changeset_attach_node(&chgset, n2), "fail attach n2\n");
 524         unittest(!of_changeset_detach_node(&chgset, nremove), "fail remove node\n");
 525         unittest(!of_changeset_attach_node(&chgset, n21), "fail attach n21\n");
 526         unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop\n");
 527         unittest(!of_changeset_update_property(&chgset, parent, ppupdate), "fail update prop\n");
 528         unittest(!of_changeset_remove_property(&chgset, parent, ppremove), "fail remove prop\n");
 529         mutex_lock(&of_mutex);
 530         unittest(!of_changeset_apply(&chgset), "apply failed\n");
 531         mutex_unlock(&of_mutex);
 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         mutex_lock(&of_mutex);
 539         unittest(!of_changeset_revert(&chgset), "revert failed\n");
 540         mutex_unlock(&of_mutex);
 541
 542         of_changeset_destroy(&chgset);
 543 #endif
 544 }
 545
 546 static void __init of_unittest_parse_interrupts(void)
 547 {
 548         struct device_node *np;
 549         struct of_phandle_args args;
 550         int i, rc;
 551
 552         np = of_find_node_by_path("/testcase-data/interrupts/interrupts0");
 553         if (!np) {
 554                 pr_err("missing testcase data\n");
 555                 return;
 556         }
 557
 558         for (i = 0; i < 4; i++) {
 559                 bool passed = true;
 560
 561                 args.args_count = 0;
 562                 rc = of_irq_parse_one(np, i, &args);
 563
 564                 passed &= !rc;
 565                 passed &= (args.args_count == 1);
 566                 passed &= (args.args[0] == (i + 1));
 567
 568                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 569                          i, args.np->full_name, rc);
 570         }
 571         of_node_put(np);
 572
 573         np = of_find_node_by_path("/testcase-data/interrupts/interrupts1");
 574         if (!np) {
 575                 pr_err("missing testcase data\n");
 576                 return;
 577         }
 578
 579         for (i = 0; i < 4; i++) {
 580                 bool passed = true;
 581
 582                 args.args_count = 0;
 583                 rc = of_irq_parse_one(np, i, &args);
 584
 585                 /* Test the values from tests-phandle.dtsi */
 586                 switch (i) {
 587                 case 0:
 588                         passed &= !rc;
 589                         passed &= (args.args_count == 1);
 590                         passed &= (args.args[0] == 9);
 591                         break;
 592                 case 1:
 593                         passed &= !rc;
 594                         passed &= (args.args_count == 3);
 595                         passed &= (args.args[0] == 10);
 596                         passed &= (args.args[1] == 11);
 597                         passed &= (args.args[2] == 12);
 598                         break;
 599                 case 2:
 600                         passed &= !rc;
 601                         passed &= (args.args_count == 2);
 602                         passed &= (args.args[0] == 13);
 603                         passed &= (args.args[1] == 14);
 604                         break;
 605                 case 3:
 606                         passed &= !rc;
 607                         passed &= (args.args_count == 2);
 608                         passed &= (args.args[0] == 15);
 609                         passed &= (args.args[1] == 16);
 610                         break;
 611                 default:
 612                         passed = false;
 613                 }
 614                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 615                          i, args.np->full_name, rc);
 616         }
 617         of_node_put(np);
 618 }
 619
 620 static void __init of_unittest_parse_interrupts_extended(void)
 621 {
 622         struct device_node *np;
 623         struct of_phandle_args args;
 624         int i, rc;
 625
 626         np = of_find_node_by_path("/testcase-data/interrupts/interrupts-extended0");
 627         if (!np) {
 628                 pr_err("missing testcase data\n");
 629                 return;
 630         }
 631
 632         for (i = 0; i < 7; i++) {
 633                 bool passed = true;
 634
 635                 rc = of_irq_parse_one(np, i, &args);
 636
 637                 /* Test the values from tests-phandle.dtsi */
 638                 switch (i) {
 639                 case 0:
 640                         passed &= !rc;
 641                         passed &= (args.args_count == 1);
 642                         passed &= (args.args[0] == 1);
 643                         break;
 644                 case 1:
 645                         passed &= !rc;
 646                         passed &= (args.args_count == 3);
 647                         passed &= (args.args[0] == 2);
 648                         passed &= (args.args[1] == 3);
 649                         passed &= (args.args[2] == 4);
 650                         break;
 651                 case 2:
 652                         passed &= !rc;
 653                         passed &= (args.args_count == 2);
 654                         passed &= (args.args[0] == 5);
 655                         passed &= (args.args[1] == 6);
 656                         break;
 657                 case 3:
 658                         passed &= !rc;
 659                         passed &= (args.args_count == 1);
 660                         passed &= (args.args[0] == 9);
 661                         break;
 662                 case 4:
 663                         passed &= !rc;
 664                         passed &= (args.args_count == 3);
 665                         passed &= (args.args[0] == 10);
 666                         passed &= (args.args[1] == 11);
 667                         passed &= (args.args[2] == 12);
 668                         break;
 669                 case 5:
 670                         passed &= !rc;
 671                         passed &= (args.args_count == 2);
 672                         passed &= (args.args[0] == 13);
 673                         passed &= (args.args[1] == 14);
 674                         break;
 675                 case 6:
 676                         passed &= !rc;
 677                         passed &= (args.args_count == 1);
 678                         passed &= (args.args[0] == 15);
 679                         break;
 680                 default:
 681                         passed = false;
 682                 }
 683
 684                 unittest(passed, "index %i - data error on node %s rc=%i\n",
 685                          i, args.np->full_name, rc);
 686         }
 687         of_node_put(np);
 688 }
 689
 690 static const struct of_device_id match_node_table[] = {
 691         { .data = "A", .name = "name0", }, /* Name alone is lowest priority */
 692         { .data = "B", .type = "type1", }, /* followed by type alone */
 693
 694         { .data = "Ca", .name = "name2", .type = "type1", }, /* followed by both together */
 695         { .data = "Cb", .name = "name2", }, /* Only match when type doesn't match */
 696         { .data = "Cc", .name = "name2", .type = "type2", },
 697
 698         { .data = "E", .compatible = "compat3" },
 699         { .data = "G", .compatible = "compat2", },
 700         { .data = "H", .compatible = "compat2", .name = "name5", },
 701         { .data = "I", .compatible = "compat2", .type = "type1", },
 702         { .data = "J", .compatible = "compat2", .type = "type1", .name = "name8", },
 703         { .data = "K", .compatible = "compat2", .name = "name9", },
 704         {}
 705 };
 706
 707 static struct {
 708         const char *path;
 709         const char *data;
 710 } match_node_tests[] = {
 711         { .path = "/testcase-data/match-node/name0", .data = "A", },
 712         { .path = "/testcase-data/match-node/name1", .data = "B", },
 713         { .path = "/testcase-data/match-node/a/name2", .data = "Ca", },
 714         { .path = "/testcase-data/match-node/b/name2", .data = "Cb", },
 715         { .path = "/testcase-data/match-node/c/name2", .data = "Cc", },
 716         { .path = "/testcase-data/match-node/name3", .data = "E", },
 717         { .path = "/testcase-data/match-node/name4", .data = "G", },
 718         { .path = "/testcase-data/match-node/name5", .data = "H", },
 719         { .path = "/testcase-data/match-node/name6", .data = "G", },
 720         { .path = "/testcase-data/match-node/name7", .data = "I", },
 721         { .path = "/testcase-data/match-node/name8", .data = "J", },
 722         { .path = "/testcase-data/match-node/name9", .data = "K", },
 723 };
 724
 725 static void __init of_unittest_match_node(void)
 726 {
 727         struct device_node *np;
 728         const struct of_device_id *match;
 729         int i;
 730
 731         for (i = 0; i < ARRAY_SIZE(match_node_tests); i++) {
 732                 np = of_find_node_by_path(match_node_tests[i].path);
 733                 if (!np) {
 734                         unittest(0, "missing testcase node %s\n",
 735                                 match_node_tests[i].path);
 736                         continue;
 737                 }
 738
 739                 match = of_match_node(match_node_table, np);
 740                 if (!match) {
 741                         unittest(0, "%s didn't match anything\n",
 742                                 match_node_tests[i].path);
 743                         continue;
 744                 }
 745
 746                 if (strcmp(match->data, match_node_tests[i].data) != 0) {
 747                         unittest(0, "%s got wrong match. expected %s, got %s\n",
 748                                 match_node_tests[i].path, match_node_tests[i].data,
 749                                 (const char *)match->data);
 750                         continue;
 751                 }
 752                 unittest(1, "passed");
 753         }
 754 }
 755
 756 static const struct platform_device_info test_bus_info = {
 757         .name = "unittest-bus",
 758 };
 759 static void __init of_unittest_platform_populate(void)
 760 {
 761         int irq, rc;
 762         struct device_node *np, *child, *grandchild;
 763         struct platform_device *pdev, *test_bus;
 764         const struct of_device_id match[] = {
 765                 { .compatible = "test-device", },
 766                 {}
 767         };
 768
 769         np = of_find_node_by_path("/testcase-data");
 770         of_platform_populate(np, of_default_bus_match_table, NULL, NULL);
 771
 772         /* Test that a missing irq domain returns -EPROBE_DEFER */
 773         np = of_find_node_by_path("/testcase-data/testcase-device1");
 774         pdev = of_find_device_by_node(np);
 775         unittest(pdev, "device 1 creation failed\n");
 776
 777         irq = platform_get_irq(pdev, 0);
 778         unittest(irq == -EPROBE_DEFER, "device deferred probe failed - %d\n", irq);
 779
 780         /* Test that a parsing failure does not return -EPROBE_DEFER */
 781         np = of_find_node_by_path("/testcase-data/testcase-device2");
 782         pdev = of_find_device_by_node(np);
 783         unittest(pdev, "device 2 creation failed\n");
 784         irq = platform_get_irq(pdev, 0);
 785         unittest(irq < 0 && irq != -EPROBE_DEFER, "device parsing error failed - %d\n", irq);
 786
 787         np = of_find_node_by_path("/testcase-data/platform-tests");
 788         unittest(np, "No testcase data in device tree\n");
 789         if (!np)
 790                 return;
 791
 792         test_bus = platform_device_register_full(&test_bus_info);
 793         rc = PTR_ERR_OR_ZERO(test_bus);
 794         unittest(!rc, "testbus registration failed; rc=%i\n", rc);
 795         if (rc)
 796                 return;
 797         test_bus->dev.of_node = np;
 798
 799         of_platform_populate(np, match, NULL, &test_bus->dev);
 800         for_each_child_of_node(np, child) {
 801                 for_each_child_of_node(child, grandchild)
 802                         unittest(of_find_device_by_node(grandchild),
 803                                  "Could not create device for node '%s'\n",
 804                                  grandchild->name);
 805         }
 806
 807         of_platform_depopulate(&test_bus->dev);
 808         for_each_child_of_node(np, child) {
 809                 for_each_child_of_node(child, grandchild)
 810                         unittest(!of_find_device_by_node(grandchild),
 811                                  "device didn't get destroyed '%s'\n",
 812                                  grandchild->name);
 813         }
 814
 815         platform_device_unregister(test_bus);
 816         of_node_put(np);
 817 }
 818
 819 /**
 820  *      update_node_properties - adds the properties
 821  *      of np into dup node (present in live tree) and
 822  *      updates parent of children of np to dup.
 823  *
 824  *      @np:    node already present in live tree
 825  *      @dup:   node present in live tree to be updated
 826  */
 827 static void update_node_properties(struct device_node *np,
 828                                         struct device_node *dup)
 829 {
 830         struct property *prop;
 831         struct device_node *child;
 832
 833         for_each_property_of_node(np, prop)
 834                 of_add_property(dup, prop);
 835
 836         for_each_child_of_node(np, child)
 837                 child->parent = dup;
 838 }
 839
 840 /**
 841  *      attach_node_and_children - attaches nodes
 842  *      and its children to live tree
 843  *
 844  *      @np:    Node to attach to live tree
 845  */
 846 static int attach_node_and_children(struct device_node *np)
 847 {
 848         struct device_node *next, *dup, *child;
 849         unsigned long flags;
 850
 851         dup = of_find_node_by_path(np->full_name);
 852         if (dup) {
 853                 update_node_properties(np, dup);
 854                 return 0;
 855         }
 856
 857         child = np->child;
 858         np->child = NULL;
 859
 860         mutex_lock(&of_mutex);
 861         raw_spin_lock_irqsave(&devtree_lock, flags);
 862         np->sibling = np->parent->child;
 863         np->parent->child = np;
 864         of_node_clear_flag(np, OF_DETACHED);
 865         raw_spin_unlock_irqrestore(&devtree_lock, flags);
 866
 867         __of_attach_node_sysfs(np);
 868         mutex_unlock(&of_mutex);
 869
 870         while (child) {
 871                 next = child->sibling;
 872                 attach_node_and_children(child);
 873                 child = next;
 874         }
 875
 876         return 0;
 877 }
 878
 879 /**
 880  *      unittest_data_add - Reads, copies data from
 881  *      linked tree and attaches it to the live tree
 882  */
 883 static int __init unittest_data_add(void)
 884 {
 885         void *unittest_data;
 886         struct device_node *unittest_data_node, *np;
 887         /*
 888          * __dtb_testcases_begin[] and __dtb_testcases_end[] are magically
 889          * created by cmd_dt_S_dtb in scripts/Makefile.lib
 890          */
 891         extern uint8_t __dtb_testcases_begin[];
 892         extern uint8_t __dtb_testcases_end[];
 893         const int size = __dtb_testcases_end - __dtb_testcases_begin;
 894         int rc;
 895
 896         if (!size) {
 897                 pr_warn("%s: No testcase data to attach; not running tests\n",
 898                         __func__);
 899                 return -ENODATA;
 900         }
 901
 902         /* creating copy */
 903         unittest_data = kmemdup(__dtb_testcases_begin, size, GFP_KERNEL);
 904
 905         if (!unittest_data) {
 906                 pr_warn("%s: Failed to allocate memory for unittest_data; "
 907                         "not running tests\n", __func__);
 908                 return -ENOMEM;
 909         }
 910         of_fdt_unflatten_tree(unittest_data, &unittest_data_node);
 911         if (!unittest_data_node) {
 912                 pr_warn("%s: No tree to attach; not running tests\n", __func__);
 913                 return -ENODATA;
 914         }
 915         of_node_set_flag(unittest_data_node, OF_DETACHED);
 916         rc = of_resolve_phandles(unittest_data_node);
 917         if (rc) {
 918                 pr_err("%s: Failed to resolve phandles (rc=%i)\n", __func__, rc);
 919                 return -EINVAL;
 920         }
 921
 922         if (!of_root) {
 923                 of_root = unittest_data_node;
 924                 for_each_of_allnodes(np)
 925                         __of_attach_node_sysfs(np);
 926                 of_aliases = of_find_node_by_path("/aliases");
 927                 of_chosen = of_find_node_by_path("/chosen");
 928                 return 0;
 929         }
 930
 931         /* attach the sub-tree to live tree */
 932         np = unittest_data_node->child;
 933         while (np) {
 934                 struct device_node *next = np->sibling;
 935
 936                 np->parent = of_root;
 937                 attach_node_and_children(np);
 938                 np = next;
 939         }
 940         return 0;
 941 }
 942
 943 #ifdef CONFIG_OF_OVERLAY
 944
 945 static int unittest_probe(struct platform_device *pdev)
 946 {
 947         struct device *dev = &pdev->dev;
 948         struct device_node *np = dev->of_node;
 949
 950         if (np == NULL) {
 951                 dev_err(dev, "No OF data for device\n");
 952                 return -EINVAL;
 953
 954         }
 955
 956         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 957
 958         of_platform_populate(np, NULL, NULL, &pdev->dev);
 959
 960         return 0;
 961 }
 962
 963 static int unittest_remove(struct platform_device *pdev)
 964 {
 965         struct device *dev = &pdev->dev;
 966         struct device_node *np = dev->of_node;
 967
 968         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
 969         return 0;
 970 }
 971
 972 static const struct of_device_id unittest_match[] = {
 973         { .compatible = "unittest", },
 974         {},
 975 };
 976
 977 static struct platform_driver unittest_driver = {
 978         .probe                  = unittest_probe,
 979         .remove                 = unittest_remove,
 980         .driver = {
 981                 .name           = "unittest",
 982                 .owner          = THIS_MODULE,
 983                 .of_match_table = of_match_ptr(unittest_match),
 984         },
 985 };
 986
 987 /* get the platform device instantiated at the path */
 988 static struct platform_device *of_path_to_platform_device(const char *path)
 989 {
 990         struct device_node *np;
 991         struct platform_device *pdev;
 992
 993         np = of_find_node_by_path(path);
 994         if (np == NULL)
 995                 return NULL;
 996
 997         pdev = of_find_device_by_node(np);
 998         of_node_put(np);
 999
1000         return pdev;
1001 }
1002
1003 /* find out if a platform device exists at that path */
1004 static int of_path_platform_device_exists(const char *path)
1005 {
1006         struct platform_device *pdev;
1007
1008         pdev = of_path_to_platform_device(path);
1009         platform_device_put(pdev);
1010         return pdev != NULL;
1011 }
1012
1013 #if IS_BUILTIN(CONFIG_I2C)
1014
1015 /* get the i2c client device instantiated at the path */
1016 static struct i2c_client *of_path_to_i2c_client(const char *path)
1017 {
1018         struct device_node *np;
1019         struct i2c_client *client;
1020
1021         np = of_find_node_by_path(path);
1022         if (np == NULL)
1023                 return NULL;
1024
1025         client = of_find_i2c_device_by_node(np);
1026         of_node_put(np);
1027
1028         return client;
1029 }
1030
1031 /* find out if a i2c client device exists at that path */
1032 static int of_path_i2c_client_exists(const char *path)
1033 {
1034         struct i2c_client *client;
1035
1036         client = of_path_to_i2c_client(path);
1037         if (client)
1038                 put_device(&client->dev);
1039         return client != NULL;
1040 }
1041 #else
1042 static int of_path_i2c_client_exists(const char *path)
1043 {
1044         return 0;
1045 }
1046 #endif
1047
1048 enum overlay_type {
1049         PDEV_OVERLAY,
1050         I2C_OVERLAY
1051 };
1052
1053 static int of_path_device_type_exists(const char *path,
1054                 enum overlay_type ovtype)
1055 {
1056         switch (ovtype) {
1057         case PDEV_OVERLAY:
1058                 return of_path_platform_device_exists(path);
1059         case I2C_OVERLAY:
1060                 return of_path_i2c_client_exists(path);
1061         }
1062         return 0;
1063 }
1064
1065 static const char *unittest_path(int nr, enum overlay_type ovtype)
1066 {
1067         const char *base;
1068         static char buf[256];
1069
1070         switch (ovtype) {
1071         case PDEV_OVERLAY:
1072                 base = "/testcase-data/overlay-node/test-bus";
1073                 break;
1074         case I2C_OVERLAY:
1075                 base = "/testcase-data/overlay-node/test-bus/i2c-test-bus";
1076                 break;
1077         default:
1078                 buf[0] = '\0';
1079                 return buf;
1080         }
1081         snprintf(buf, sizeof(buf) - 1, "%s/test-unittest%d", base, nr);
1082         buf[sizeof(buf) - 1] = '\0';
1083         return buf;
1084 }
1085
1086 static int of_unittest_device_exists(int unittest_nr, enum overlay_type ovtype)
1087 {
1088         const char *path;
1089
1090         path = unittest_path(unittest_nr, ovtype);
1091
1092         switch (ovtype) {
1093         case PDEV_OVERLAY:
1094                 return of_path_platform_device_exists(path);
1095         case I2C_OVERLAY:
1096                 return of_path_i2c_client_exists(path);
1097         }
1098         return 0;
1099 }
1100
1101 static const char *overlay_path(int nr)
1102 {
1103         static char buf[256];
1104
1105         snprintf(buf, sizeof(buf) - 1,
1106                 "/testcase-data/overlay%d", nr);
1107         buf[sizeof(buf) - 1] = '\0';
1108
1109         return buf;
1110 }
1111
1112 static const char *bus_path = "/testcase-data/overlay-node/test-bus";
1113
1114 /* it is guaranteed that overlay ids are assigned in sequence */
1115 #define MAX_UNITTEST_OVERLAYS   256
1116 static unsigned long overlay_id_bits[BITS_TO_LONGS(MAX_UNITTEST_OVERLAYS)];
1117 static int overlay_first_id = -1;
1118
1119 static void of_unittest_track_overlay(int id)
1120 {
1121         if (overlay_first_id < 0)
1122                 overlay_first_id = id;
1123         id -= overlay_first_id;
1124
1125         /* we shouldn't need that many */
1126         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1127         overlay_id_bits[BIT_WORD(id)] |= BIT_MASK(id);
1128 }
1129
1130 static void of_unittest_untrack_overlay(int id)
1131 {
1132         if (overlay_first_id < 0)
1133                 return;
1134         id -= overlay_first_id;
1135         BUG_ON(id >= MAX_UNITTEST_OVERLAYS);
1136         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1137 }
1138
1139 static void of_unittest_destroy_tracked_overlays(void)
1140 {
1141         int id, ret, defers;
1142
1143         if (overlay_first_id < 0)
1144                 return;
1145
1146         /* try until no defers */
1147         do {
1148                 defers = 0;
1149                 /* remove in reverse order */
1150                 for (id = MAX_UNITTEST_OVERLAYS - 1; id >= 0; id--) {
1151                         if (!(overlay_id_bits[BIT_WORD(id)] & BIT_MASK(id)))
1152                                 continue;
1153
1154                         ret = of_overlay_destroy(id + overlay_first_id);
1155                         if (ret != 0) {
1156                                 defers++;
1157                                 pr_warn("%s: overlay destroy failed for #%d\n",
1158                                         __func__, id + overlay_first_id);
1159                                 continue;
1160                         }
1161
1162                         overlay_id_bits[BIT_WORD(id)] &= ~BIT_MASK(id);
1163                 }
1164         } while (defers > 0);
1165 }
1166
1167 static int of_unittest_apply_overlay(int unittest_nr, int overlay_nr,
1168                 int *overlay_id)
1169 {
1170         struct device_node *np = NULL;
1171         int ret, id = -1;
1172
1173         np = of_find_node_by_path(overlay_path(overlay_nr));
1174         if (np == NULL) {
1175                 unittest(0, "could not find overlay node @\"%s\"\n",
1176                                 overlay_path(overlay_nr));
1177                 ret = -EINVAL;
1178                 goto out;
1179         }
1180
1181         ret = of_overlay_create(np);
1182         if (ret < 0) {
1183                 unittest(0, "could not create overlay from \"%s\"\n",
1184                                 overlay_path(overlay_nr));
1185                 goto out;
1186         }
1187         id = ret;
1188         of_unittest_track_overlay(id);
1189
1190         ret = 0;
1191
1192 out:
1193         of_node_put(np);
1194
1195         if (overlay_id)
1196                 *overlay_id = id;
1197
1198         return ret;
1199 }
1200
1201 /* apply an overlay while checking before and after states */
1202 static int of_unittest_apply_overlay_check(int overlay_nr, int unittest_nr,
1203                 int before, int after, enum overlay_type ovtype)
1204 {
1205         int ret;
1206
1207         /* unittest device must not be in before state */
1208         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1209                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1210                                 overlay_path(overlay_nr),
1211                                 unittest_path(unittest_nr, ovtype),
1212                                 !before ? "enabled" : "disabled");
1213                 return -EINVAL;
1214         }
1215
1216         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, NULL);
1217         if (ret != 0) {
1218                 /* of_unittest_apply_overlay already called unittest() */
1219                 return ret;
1220         }
1221
1222         /* unittest device must be to set to after state */
1223         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1224                 unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1225                                 overlay_path(overlay_nr),
1226                                 unittest_path(unittest_nr, ovtype),
1227                                 !after ? "enabled" : "disabled");
1228                 return -EINVAL;
1229         }
1230
1231         return 0;
1232 }
1233
1234 /* apply an overlay and then revert it while checking before, after states */
1235 static int of_unittest_apply_revert_overlay_check(int overlay_nr,
1236                 int unittest_nr, int before, int after,
1237                 enum overlay_type ovtype)
1238 {
1239         int ret, ov_id;
1240
1241         /* unittest device must be in before state */
1242         if (of_unittest_device_exists(unittest_nr, ovtype) != before) {
1243                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1244                                 overlay_path(overlay_nr),
1245                                 unittest_path(unittest_nr, ovtype),
1246                                 !before ? "enabled" : "disabled");
1247                 return -EINVAL;
1248         }
1249
1250         /* apply the overlay */
1251         ret = of_unittest_apply_overlay(overlay_nr, unittest_nr, &ov_id);
1252         if (ret != 0) {
1253                 /* of_unittest_apply_overlay already called unittest() */
1254                 return ret;
1255         }
1256
1257         /* unittest device must be in after state */
1258         if (of_unittest_device_exists(unittest_nr, ovtype) != after) {
1259                 unittest(0, "overlay @\"%s\" failed to create @\"%s\" %s\n",
1260                                 overlay_path(overlay_nr),
1261                                 unittest_path(unittest_nr, ovtype),
1262                                 !after ? "enabled" : "disabled");
1263                 return -EINVAL;
1264         }
1265
1266         ret = of_overlay_destroy(ov_id);
1267         if (ret != 0) {
1268                 unittest(0, "overlay @\"%s\" failed to be destroyed @\"%s\"\n",
1269                                 overlay_path(overlay_nr),
1270                                 unittest_path(unittest_nr, ovtype));
1271                 return ret;
1272         }
1273
1274         /* unittest device must be again in before state */
1275         if (of_unittest_device_exists(unittest_nr, PDEV_OVERLAY) != before) {
1276                 unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1277                                 overlay_path(overlay_nr),
1278                                 unittest_path(unittest_nr, ovtype),
1279                                 !before ? "enabled" : "disabled");
1280                 return -EINVAL;
1281         }
1282
1283         return 0;
1284 }
1285
1286 /* test activation of device */
1287 static void of_unittest_overlay_0(void)
1288 {
1289         int ret;
1290
1291         /* device should enable */
1292         ret = of_unittest_apply_overlay_check(0, 0, 0, 1, PDEV_OVERLAY);
1293         if (ret != 0)
1294                 return;
1295
1296         unittest(1, "overlay test %d passed\n", 0);
1297 }
1298
1299 /* test deactivation of device */
1300 static void of_unittest_overlay_1(void)
1301 {
1302         int ret;
1303
1304         /* device should disable */
1305         ret = of_unittest_apply_overlay_check(1, 1, 1, 0, PDEV_OVERLAY);
1306         if (ret != 0)
1307                 return;
1308
1309         unittest(1, "overlay test %d passed\n", 1);
1310 }
1311
1312 /* test activation of device */
1313 static void of_unittest_overlay_2(void)
1314 {
1315         int ret;
1316
1317         /* device should enable */
1318         ret = of_unittest_apply_overlay_check(2, 2, 0, 1, PDEV_OVERLAY);
1319         if (ret != 0)
1320                 return;
1321
1322         unittest(1, "overlay test %d passed\n", 2);
1323 }
1324
1325 /* test deactivation of device */
1326 static void of_unittest_overlay_3(void)
1327 {
1328         int ret;
1329
1330         /* device should disable */
1331         ret = of_unittest_apply_overlay_check(3, 3, 1, 0, PDEV_OVERLAY);
1332         if (ret != 0)
1333                 return;
1334
1335         unittest(1, "overlay test %d passed\n", 3);
1336 }
1337
1338 /* test activation of a full device node */
1339 static void of_unittest_overlay_4(void)
1340 {
1341         int ret;
1342
1343         /* device should disable */
1344         ret = of_unittest_apply_overlay_check(4, 4, 0, 1, PDEV_OVERLAY);
1345         if (ret != 0)
1346                 return;
1347
1348         unittest(1, "overlay test %d passed\n", 4);
1349 }
1350
1351 /* test overlay apply/revert sequence */
1352 static void of_unittest_overlay_5(void)
1353 {
1354         int ret;
1355
1356         /* device should disable */
1357         ret = of_unittest_apply_revert_overlay_check(5, 5, 0, 1, PDEV_OVERLAY);
1358         if (ret != 0)
1359                 return;
1360
1361         unittest(1, "overlay test %d passed\n", 5);
1362 }
1363
1364 /* test overlay application in sequence */
1365 static void of_unittest_overlay_6(void)
1366 {
1367         struct device_node *np;
1368         int ret, i, ov_id[2];
1369         int overlay_nr = 6, unittest_nr = 6;
1370         int before = 0, after = 1;
1371
1372         /* unittest device must be in before state */
1373         for (i = 0; i < 2; i++) {
1374                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1375                                 != before) {
1376                         unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1377                                         overlay_path(overlay_nr + i),
1378                                         unittest_path(unittest_nr + i,
1379                                                 PDEV_OVERLAY),
1380                                         !before ? "enabled" : "disabled");
1381                         return;
1382                 }
1383         }
1384
1385         /* apply the overlays */
1386         for (i = 0; i < 2; i++) {
1387
1388                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1389                 if (np == NULL) {
1390                         unittest(0, "could not find overlay node @\"%s\"\n",
1391                                         overlay_path(overlay_nr + i));
1392                         return;
1393                 }
1394
1395                 ret = of_overlay_create(np);
1396                 if (ret < 0)  {
1397                         unittest(0, "could not create overlay from \"%s\"\n",
1398                                         overlay_path(overlay_nr + i));
1399                         return;
1400                 }
1401                 ov_id[i] = ret;
1402                 of_unittest_track_overlay(ov_id[i]);
1403         }
1404
1405         for (i = 0; i < 2; i++) {
1406                 /* unittest device must be in after state */
1407                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1408                                 != after) {
1409                         unittest(0, "overlay @\"%s\" failed @\"%s\" %s\n",
1410                                         overlay_path(overlay_nr + i),
1411                                         unittest_path(unittest_nr + i,
1412                                                 PDEV_OVERLAY),
1413                                         !after ? "enabled" : "disabled");
1414                         return;
1415                 }
1416         }
1417
1418         for (i = 1; i >= 0; i--) {
1419                 ret = of_overlay_destroy(ov_id[i]);
1420                 if (ret != 0) {
1421                         unittest(0, "overlay @\"%s\" failed destroy @\"%s\"\n",
1422                                         overlay_path(overlay_nr + i),
1423                                         unittest_path(unittest_nr + i,
1424                                                 PDEV_OVERLAY));
1425                         return;
1426                 }
1427                 of_unittest_untrack_overlay(ov_id[i]);
1428         }
1429
1430         for (i = 0; i < 2; i++) {
1431                 /* unittest device must be again in before state */
1432                 if (of_unittest_device_exists(unittest_nr + i, PDEV_OVERLAY)
1433                                 != before) {
1434                         unittest(0, "overlay @\"%s\" with device @\"%s\" %s\n",
1435                                         overlay_path(overlay_nr + i),
1436                                         unittest_path(unittest_nr + i,
1437                                                 PDEV_OVERLAY),
1438                                         !before ? "enabled" : "disabled");
1439                         return;
1440                 }
1441         }
1442
1443         unittest(1, "overlay test %d passed\n", 6);
1444 }
1445
1446 /* test overlay application in sequence */
1447 static void of_unittest_overlay_8(void)
1448 {
1449         struct device_node *np;
1450         int ret, i, ov_id[2];
1451         int overlay_nr = 8, unittest_nr = 8;
1452
1453         /* we don't care about device state in this test */
1454
1455         /* apply the overlays */
1456         for (i = 0; i < 2; i++) {
1457
1458                 np = of_find_node_by_path(overlay_path(overlay_nr + i));
1459                 if (np == NULL) {
1460                         unittest(0, "could not find overlay node @\"%s\"\n",
1461                                         overlay_path(overlay_nr + i));
1462                         return;
1463                 }
1464
1465                 ret = of_overlay_create(np);
1466                 if (ret < 0)  {
1467                         unittest(0, "could not create overlay from \"%s\"\n",
1468                                         overlay_path(overlay_nr + i));
1469                         return;
1470                 }
1471                 ov_id[i] = ret;
1472                 of_unittest_track_overlay(ov_id[i]);
1473         }
1474
1475         /* now try to remove first overlay (it should fail) */
1476         ret = of_overlay_destroy(ov_id[0]);
1477         if (ret == 0) {
1478                 unittest(0, "overlay @\"%s\" was destroyed @\"%s\"\n",
1479                                 overlay_path(overlay_nr + 0),
1480                                 unittest_path(unittest_nr,
1481                                         PDEV_OVERLAY));
1482                 return;
1483         }
1484
1485         /* removing them in order should work */
1486         for (i = 1; i >= 0; i--) {
1487                 ret = of_overlay_destroy(ov_id[i]);
1488                 if (ret != 0) {
1489                         unittest(0, "overlay @\"%s\" not destroyed @\"%s\"\n",
1490                                         overlay_path(overlay_nr + i),
1491                                         unittest_path(unittest_nr,
1492                                                 PDEV_OVERLAY));
1493                         return;
1494                 }
1495                 of_unittest_untrack_overlay(ov_id[i]);
1496         }
1497
1498         unittest(1, "overlay test %d passed\n", 8);
1499 }
1500
1501 /* test insertion of a bus with parent devices */
1502 static void of_unittest_overlay_10(void)
1503 {
1504         int ret;
1505         char *child_path;
1506
1507         /* device should disable */
1508         ret = of_unittest_apply_overlay_check(10, 10, 0, 1, PDEV_OVERLAY);
1509         if (unittest(ret == 0,
1510                         "overlay test %d failed; overlay application\n", 10))
1511                 return;
1512
1513         child_path = kasprintf(GFP_KERNEL, "%s/test-unittest101",
1514                         unittest_path(10, PDEV_OVERLAY));
1515         if (unittest(child_path, "overlay test %d failed; kasprintf\n", 10))
1516                 return;
1517
1518         ret = of_path_device_type_exists(child_path, PDEV_OVERLAY);
1519         kfree(child_path);
1520         if (unittest(ret, "overlay test %d failed; no child device\n", 10))
1521                 return;
1522 }
1523
1524 /* test insertion of a bus with parent devices (and revert) */
1525 static void of_unittest_overlay_11(void)
1526 {
1527         int ret;
1528
1529         /* device should disable */
1530         ret = of_unittest_apply_revert_overlay_check(11, 11, 0, 1,
1531                         PDEV_OVERLAY);
1532         if (unittest(ret == 0,
1533                         "overlay test %d failed; overlay application\n", 11))
1534                 return;
1535 }
1536
1537 #if IS_BUILTIN(CONFIG_I2C) && IS_ENABLED(CONFIG_OF_OVERLAY)
1538
1539 struct unittest_i2c_bus_data {
1540         struct platform_device  *pdev;
1541         struct i2c_adapter      adap;
1542 };
1543
1544 static int unittest_i2c_master_xfer(struct i2c_adapter *adap,
1545                 struct i2c_msg *msgs, int num)
1546 {
1547         struct unittest_i2c_bus_data *std = i2c_get_adapdata(adap);
1548
1549         (void)std;
1550
1551         return num;
1552 }
1553
1554 static u32 unittest_i2c_functionality(struct i2c_adapter *adap)
1555 {
1556         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
1557 }
1558
1559 static const struct i2c_algorithm unittest_i2c_algo = {
1560         .master_xfer    = unittest_i2c_master_xfer,
1561         .functionality  = unittest_i2c_functionality,
1562 };
1563
1564 static int unittest_i2c_bus_probe(struct platform_device *pdev)
1565 {
1566         struct device *dev = &pdev->dev;
1567         struct device_node *np = dev->of_node;
1568         struct unittest_i2c_bus_data *std;
1569         struct i2c_adapter *adap;
1570         int ret;
1571
1572         if (np == NULL) {
1573                 dev_err(dev, "No OF data for device\n");
1574                 return -EINVAL;
1575
1576         }
1577
1578         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1579
1580         std = devm_kzalloc(dev, sizeof(*std), GFP_KERNEL);
1581         if (!std) {
1582                 dev_err(dev, "Failed to allocate unittest i2c data\n");
1583                 return -ENOMEM;
1584         }
1585
1586         /* link them together */
1587         std->pdev = pdev;
1588         platform_set_drvdata(pdev, std);
1589
1590         adap = &std->adap;
1591         i2c_set_adapdata(adap, std);
1592         adap->nr = -1;
1593         strlcpy(adap->name, pdev->name, sizeof(adap->name));
1594         adap->class = I2C_CLASS_DEPRECATED;
1595         adap->algo = &unittest_i2c_algo;
1596         adap->dev.parent = dev;
1597         adap->dev.of_node = dev->of_node;
1598         adap->timeout = 5 * HZ;
1599         adap->retries = 3;
1600
1601         ret = i2c_add_numbered_adapter(adap);
1602         if (ret != 0) {
1603                 dev_err(dev, "Failed to add I2C adapter\n");
1604                 return ret;
1605         }
1606
1607         return 0;
1608 }
1609
1610 static int unittest_i2c_bus_remove(struct platform_device *pdev)
1611 {
1612         struct device *dev = &pdev->dev;
1613         struct device_node *np = dev->of_node;
1614         struct unittest_i2c_bus_data *std = platform_get_drvdata(pdev);
1615
1616         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1617         i2c_del_adapter(&std->adap);
1618
1619         return 0;
1620 }
1621
1622 static const struct of_device_id unittest_i2c_bus_match[] = {
1623         { .compatible = "unittest-i2c-bus", },
1624         {},
1625 };
1626
1627 static struct platform_driver unittest_i2c_bus_driver = {
1628         .probe                  = unittest_i2c_bus_probe,
1629         .remove                 = unittest_i2c_bus_remove,
1630         .driver = {
1631                 .name           = "unittest-i2c-bus",
1632                 .of_match_table = of_match_ptr(unittest_i2c_bus_match),
1633         },
1634 };
1635
1636 static int unittest_i2c_dev_probe(struct i2c_client *client,
1637                 const struct i2c_device_id *id)
1638 {
1639         struct device *dev = &client->dev;
1640         struct device_node *np = client->dev.of_node;
1641
1642         if (!np) {
1643                 dev_err(dev, "No OF node\n");
1644                 return -EINVAL;
1645         }
1646
1647         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1648
1649         return 0;
1650 };
1651
1652 static int unittest_i2c_dev_remove(struct i2c_client *client)
1653 {
1654         struct device *dev = &client->dev;
1655         struct device_node *np = client->dev.of_node;
1656
1657         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1658         return 0;
1659 }
1660
1661 static const struct i2c_device_id unittest_i2c_dev_id[] = {
1662         { .name = "unittest-i2c-dev" },
1663         { }
1664 };
1665
1666 static struct i2c_driver unittest_i2c_dev_driver = {
1667         .driver = {
1668                 .name = "unittest-i2c-dev",
1669                 .owner = THIS_MODULE,
1670         },
1671         .probe = unittest_i2c_dev_probe,
1672         .remove = unittest_i2c_dev_remove,
1673         .id_table = unittest_i2c_dev_id,
1674 };
1675
1676 #if IS_BUILTIN(CONFIG_I2C_MUX)
1677
1678 struct unittest_i2c_mux_data {
1679         int nchans;
1680         struct i2c_adapter *adap[];
1681 };
1682
1683 static int unittest_i2c_mux_select_chan(struct i2c_adapter *adap,
1684                                void *client, u32 chan)
1685 {
1686         return 0;
1687 }
1688
1689 static int unittest_i2c_mux_probe(struct i2c_client *client,
1690                 const struct i2c_device_id *id)
1691 {
1692         int ret, i, nchans, size;
1693         struct device *dev = &client->dev;
1694         struct i2c_adapter *adap = to_i2c_adapter(dev->parent);
1695         struct device_node *np = client->dev.of_node, *child;
1696         struct unittest_i2c_mux_data *stm;
1697         u32 reg, max_reg;
1698
1699         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1700
1701         if (!np) {
1702                 dev_err(dev, "No OF node\n");
1703                 return -EINVAL;
1704         }
1705
1706         max_reg = (u32)-1;
1707         for_each_child_of_node(np, child) {
1708                 ret = of_property_read_u32(child, "reg", &reg);
1709                 if (ret)
1710                         continue;
1711                 if (max_reg == (u32)-1 || reg > max_reg)
1712                         max_reg = reg;
1713         }
1714         nchans = max_reg == (u32)-1 ? 0 : max_reg + 1;
1715         if (nchans == 0) {
1716                 dev_err(dev, "No channels\n");
1717                 return -EINVAL;
1718         }
1719
1720         size = offsetof(struct unittest_i2c_mux_data, adap[nchans]);
1721         stm = devm_kzalloc(dev, size, GFP_KERNEL);
1722         if (!stm) {
1723                 dev_err(dev, "Out of memory\n");
1724                 return -ENOMEM;
1725         }
1726         stm->nchans = nchans;
1727         for (i = 0; i < nchans; i++) {
1728                 stm->adap[i] = i2c_add_mux_adapter(adap, dev, client,
1729                                 0, i, 0, unittest_i2c_mux_select_chan, NULL);
1730                 if (!stm->adap[i]) {
1731                         dev_err(dev, "Failed to register mux #%d\n", i);
1732                         for (i--; i >= 0; i--)
1733                                 i2c_del_mux_adapter(stm->adap[i]);
1734                         return -ENODEV;
1735                 }
1736         }
1737
1738         i2c_set_clientdata(client, stm);
1739
1740         return 0;
1741 };
1742
1743 static int unittest_i2c_mux_remove(struct i2c_client *client)
1744 {
1745         struct device *dev = &client->dev;
1746         struct device_node *np = client->dev.of_node;
1747         struct unittest_i2c_mux_data *stm = i2c_get_clientdata(client);
1748         int i;
1749
1750         dev_dbg(dev, "%s for node @%s\n", __func__, np->full_name);
1751         for (i = stm->nchans - 1; i >= 0; i--)
1752                 i2c_del_mux_adapter(stm->adap[i]);
1753         return 0;
1754 }
1755
1756 static const struct i2c_device_id unittest_i2c_mux_id[] = {
1757         { .name = "unittest-i2c-mux" },
1758         { }
1759 };
1760
1761 static struct i2c_driver unittest_i2c_mux_driver = {
1762         .driver = {
1763                 .name = "unittest-i2c-mux",
1764                 .owner = THIS_MODULE,
1765         },
1766         .probe = unittest_i2c_mux_probe,
1767         .remove = unittest_i2c_mux_remove,
1768         .id_table = unittest_i2c_mux_id,
1769 };
1770
1771 #endif
1772
1773 static int of_unittest_overlay_i2c_init(void)
1774 {
1775         int ret;
1776
1777         ret = i2c_add_driver(&unittest_i2c_dev_driver);
1778         if (unittest(ret == 0,
1779                         "could not register unittest i2c device driver\n"))
1780                 return ret;
1781
1782         ret = platform_driver_register(&unittest_i2c_bus_driver);
1783         if (unittest(ret == 0,
1784                         "could not register unittest i2c bus driver\n"))
1785                 return ret;
1786
1787 #if IS_BUILTIN(CONFIG_I2C_MUX)
1788         ret = i2c_add_driver(&unittest_i2c_mux_driver);
1789         if (unittest(ret == 0,
1790                         "could not register unittest i2c mux driver\n"))
1791                 return ret;
1792 #endif
1793
1794         return 0;
1795 }
1796
1797 static void of_unittest_overlay_i2c_cleanup(void)
1798 {
1799 #if IS_BUILTIN(CONFIG_I2C_MUX)
1800         i2c_del_driver(&unittest_i2c_mux_driver);
1801 #endif
1802         platform_driver_unregister(&unittest_i2c_bus_driver);
1803         i2c_del_driver(&unittest_i2c_dev_driver);
1804 }
1805
1806 static void of_unittest_overlay_i2c_12(void)
1807 {
1808         int ret;
1809
1810         /* device should enable */
1811         ret = of_unittest_apply_overlay_check(12, 12, 0, 1, I2C_OVERLAY);
1812         if (ret != 0)
1813                 return;
1814
1815         unittest(1, "overlay test %d passed\n", 12);
1816 }
1817
1818 /* test deactivation of device */
1819 static void of_unittest_overlay_i2c_13(void)
1820 {
1821         int ret;
1822
1823         /* device should disable */
1824         ret = of_unittest_apply_overlay_check(13, 13, 1, 0, I2C_OVERLAY);
1825         if (ret != 0)
1826                 return;
1827
1828         unittest(1, "overlay test %d passed\n", 13);
1829 }
1830
1831 /* just check for i2c mux existence */
1832 static void of_unittest_overlay_i2c_14(void)
1833 {
1834 }
1835
1836 static void of_unittest_overlay_i2c_15(void)
1837 {
1838         int ret;
1839
1840         /* device should enable */
1841         ret = of_unittest_apply_overlay_check(16, 15, 0, 1, I2C_OVERLAY);
1842         if (ret != 0)
1843                 return;
1844
1845         unittest(1, "overlay test %d passed\n", 15);
1846 }
1847
1848 #else
1849
1850 static inline void of_unittest_overlay_i2c_14(void) { }
1851 static inline void of_unittest_overlay_i2c_15(void) { }
1852
1853 #endif
1854
1855 static void __init of_unittest_overlay(void)
1856 {
1857         struct device_node *bus_np = NULL;
1858         int ret;
1859
1860         ret = platform_driver_register(&unittest_driver);
1861         if (ret != 0) {
1862                 unittest(0, "could not register unittest driver\n");
1863                 goto out;
1864         }
1865
1866         bus_np = of_find_node_by_path(bus_path);
1867         if (bus_np == NULL) {
1868                 unittest(0, "could not find bus_path \"%s\"\n", bus_path);
1869                 goto out;
1870         }
1871
1872         ret = of_platform_populate(bus_np, of_default_bus_match_table,
1873                         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);