scripts/dtc/checks.c

   1 /*
   2  * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2007.
   3  *
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  18  *                                                                   USA
  19  */
  20
  21 #include "dtc.h"
  22
  23 #ifdef TRACE_CHECKS
  24 #define TRACE(c, ...) \
  25         do { \
  26                 fprintf(stderr, "=== %s: ", (c)->name); \
  27                 fprintf(stderr, __VA_ARGS__); \
  28                 fprintf(stderr, "\n"); \
  29         } while (0)
  30 #else
  31 #define TRACE(c, fmt, ...)      do { } while (0)
  32 #endif
  33
  34 enum checkstatus {
  35         UNCHECKED = 0,
  36         PREREQ,
  37         PASSED,
  38         FAILED,
  39 };
  40
  41 struct check;
  42
  43 typedef void (*check_fn)(struct check *c, struct dt_info *dti, struct node *node);
  44
  45 struct check {
  46         const char *name;
  47         check_fn fn;
  48         void *data;
  49         bool warn, error;
  50         enum checkstatus status;
  51         bool inprogress;
  52         int num_prereqs;
  53         struct check **prereq;
  54 };
  55
  56 #define CHECK_ENTRY(nm_, fn_, d_, w_, e_, ...)         \
  57         static struct check *nm_##_prereqs[] = { __VA_ARGS__ }; \
  58         static struct check nm_ = { \
  59                 .name = #nm_, \
  60                 .fn = (fn_), \
  61                 .data = (d_), \
  62                 .warn = (w_), \
  63                 .error = (e_), \
  64                 .status = UNCHECKED, \
  65                 .num_prereqs = ARRAY_SIZE(nm_##_prereqs), \
  66                 .prereq = nm_##_prereqs, \
  67         };
  68 #define WARNING(nm_, fn_, d_, ...) \
  69         CHECK_ENTRY(nm_, fn_, d_, true, false, __VA_ARGS__)
  70 #define ERROR(nm_, fn_, d_, ...) \
  71         CHECK_ENTRY(nm_, fn_, d_, false, true, __VA_ARGS__)
  72 #define CHECK(nm_, fn_, d_, ...) \
  73         CHECK_ENTRY(nm_, fn_, d_, false, false, __VA_ARGS__)
  74
  75 static inline void  PRINTF(5, 6) check_msg(struct check *c, struct dt_info *dti,
  76                                            struct node *node,
  77                                            struct property *prop,
  78                                            const char *fmt, ...)
  79 {
  80         va_list ap;
  81         va_start(ap, fmt);
  82
  83         if ((c->warn && (quiet < 1))
  84             || (c->error && (quiet < 2))) {
  85                 fprintf(stderr, "%s: %s (%s): ",
  86                         strcmp(dti->outname, "-") ? dti->outname : "<stdout>",
  87                         (c->error) ? "ERROR" : "Warning", c->name);
  88                 if (node) {
  89                         fprintf(stderr, "%s", node->fullpath);
  90                         if (prop)
  91                                 fprintf(stderr, ":%s", prop->name);
  92                         fputs(": ", stderr);
  93                 }
  94                 vfprintf(stderr, fmt, ap);
  95                 fprintf(stderr, "\n");
  96         }
  97         va_end(ap);
  98 }
  99
 100 #define FAIL(c, dti, node, ...)                                         \
 101         do {                                                            \
 102                 TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__);  \
 103                 (c)->status = FAILED;                                   \
 104                 check_msg((c), dti, node, NULL, __VA_ARGS__);           \
 105         } while (0)
 106
 107 #define FAIL_PROP(c, dti, node, prop, ...)                              \
 108         do {                                                            \
 109                 TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__);  \
 110                 (c)->status = FAILED;                                   \
 111                 check_msg((c), dti, node, prop, __VA_ARGS__);           \
 112         } while (0)
 113
 114
 115 static void check_nodes_props(struct check *c, struct dt_info *dti, struct node *node)
 116 {
 117         struct node *child;
 118
 119         TRACE(c, "%s", node->fullpath);
 120         if (c->fn)
 121                 c->fn(c, dti, node);
 122
 123         for_each_child(node, child)
 124                 check_nodes_props(c, dti, child);
 125 }
 126
 127 static bool run_check(struct check *c, struct dt_info *dti)
 128 {
 129         struct node *dt = dti->dt;
 130         bool error = false;
 131         int i;
 132
 133         assert(!c->inprogress);
 134
 135         if (c->status != UNCHECKED)
 136                 goto out;
 137
 138         c->inprogress = true;
 139
 140         for (i = 0; i < c->num_prereqs; i++) {
 141                 struct check *prq = c->prereq[i];
 142                 error = error || run_check(prq, dti);
 143                 if (prq->status != PASSED) {
 144                         c->status = PREREQ;
 145                         check_msg(c, dti, NULL, NULL, "Failed prerequisite '%s'",
 146                                   c->prereq[i]->name);
 147                 }
 148         }
 149
 150         if (c->status != UNCHECKED)
 151                 goto out;
 152
 153         check_nodes_props(c, dti, dt);
 154
 155         if (c->status == UNCHECKED)
 156                 c->status = PASSED;
 157
 158         TRACE(c, "\tCompleted, status %d", c->status);
 159
 160 out:
 161         c->inprogress = false;
 162         if ((c->status != PASSED) && (c->error))
 163                 error = true;
 164         return error;
 165 }
 166
 167 /*
 168  * Utility check functions
 169  */
 170
 171 /* A check which always fails, for testing purposes only */
 172 static inline void check_always_fail(struct check *c, struct dt_info *dti,
 173                                      struct node *node)
 174 {
 175         FAIL(c, dti, node, "always_fail check");
 176 }
 177 CHECK(always_fail, check_always_fail, NULL);
 178
 179 static void check_is_string(struct check *c, struct dt_info *dti,
 180                             struct node *node)
 181 {
 182         struct property *prop;
 183         char *propname = c->data;
 184
 185         prop = get_property(node, propname);
 186         if (!prop)
 187                 return; /* Not present, assumed ok */
 188
 189         if (!data_is_one_string(prop->val))
 190                 FAIL_PROP(c, dti, node, prop, "property is not a string");
 191 }
 192 #define WARNING_IF_NOT_STRING(nm, propname) \
 193         WARNING(nm, check_is_string, (propname))
 194 #define ERROR_IF_NOT_STRING(nm, propname) \
 195         ERROR(nm, check_is_string, (propname))
 196
 197 static void check_is_string_list(struct check *c, struct dt_info *dti,
 198                                  struct node *node)
 199 {
 200         int rem, l;
 201         struct property *prop;
 202         char *propname = c->data;
 203         char *str;
 204
 205         prop = get_property(node, propname);
 206         if (!prop)
 207                 return; /* Not present, assumed ok */
 208
 209         str = prop->val.val;
 210         rem = prop->val.len;
 211         while (rem > 0) {
 212                 l = strnlen(str, rem);
 213                 if (l == rem) {
 214                         FAIL_PROP(c, dti, node, prop, "property is not a string list");
 215                         break;
 216                 }
 217                 rem -= l + 1;
 218                 str += l + 1;
 219         }
 220 }
 221 #define WARNING_IF_NOT_STRING_LIST(nm, propname) \
 222         WARNING(nm, check_is_string_list, (propname))
 223 #define ERROR_IF_NOT_STRING_LIST(nm, propname) \
 224         ERROR(nm, check_is_string_list, (propname))
 225
 226 static void check_is_cell(struct check *c, struct dt_info *dti,
 227                           struct node *node)
 228 {
 229         struct property *prop;
 230         char *propname = c->data;
 231
 232         prop = get_property(node, propname);
 233         if (!prop)
 234                 return; /* Not present, assumed ok */
 235
 236         if (prop->val.len != sizeof(cell_t))
 237                 FAIL_PROP(c, dti, node, prop, "property is not a single cell");
 238 }
 239 #define WARNING_IF_NOT_CELL(nm, propname) \
 240         WARNING(nm, check_is_cell, (propname))
 241 #define ERROR_IF_NOT_CELL(nm, propname) \
 242         ERROR(nm, check_is_cell, (propname))
 243
 244 /*
 245  * Structural check functions
 246  */
 247
 248 static void check_duplicate_node_names(struct check *c, struct dt_info *dti,
 249                                        struct node *node)
 250 {
 251         struct node *child, *child2;
 252
 253         for_each_child(node, child)
 254                 for (child2 = child->next_sibling;
 255                      child2;
 256                      child2 = child2->next_sibling)
 257                         if (streq(child->name, child2->name))
 258                                 FAIL(c, dti, child2, "Duplicate node name");
 259 }
 260 ERROR(duplicate_node_names, check_duplicate_node_names, NULL);
 261
 262 static void check_duplicate_property_names(struct check *c, struct dt_info *dti,
 263                                            struct node *node)
 264 {
 265         struct property *prop, *prop2;
 266
 267         for_each_property(node, prop) {
 268                 for (prop2 = prop->next; prop2; prop2 = prop2->next) {
 269                         if (prop2->deleted)
 270                                 continue;
 271                         if (streq(prop->name, prop2->name))
 272                                 FAIL_PROP(c, dti, node, prop, "Duplicate property name");
 273                 }
 274         }
 275 }
 276 ERROR(duplicate_property_names, check_duplicate_property_names, NULL);
 277
 278 #define LOWERCASE       "abcdefghijklmnopqrstuvwxyz"
 279 #define UPPERCASE       "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 280 #define DIGITS          "0123456789"
 281 #define PROPNODECHARS   LOWERCASE UPPERCASE DIGITS ",._+*#?-"
 282 #define PROPNODECHARSSTRICT     LOWERCASE UPPERCASE DIGITS ",-"
 283
 284 static void check_node_name_chars(struct check *c, struct dt_info *dti,
 285                                   struct node *node)
 286 {
 287         int n = strspn(node->name, c->data);
 288
 289         if (n < strlen(node->name))
 290                 FAIL(c, dti, node, "Bad character '%c' in node name",
 291                      node->name[n]);
 292 }
 293 ERROR(node_name_chars, check_node_name_chars, PROPNODECHARS "@");
 294
 295 static void check_node_name_chars_strict(struct check *c, struct dt_info *dti,
 296                                          struct node *node)
 297 {
 298         int n = strspn(node->name, c->data);
 299
 300         if (n < node->basenamelen)
 301                 FAIL(c, dti, node, "Character '%c' not recommended in node name",
 302                      node->name[n]);
 303 }
 304 CHECK(node_name_chars_strict, check_node_name_chars_strict, PROPNODECHARSSTRICT);
 305
 306 static void check_node_name_format(struct check *c, struct dt_info *dti,
 307                                    struct node *node)
 308 {
 309         if (strchr(get_unitname(node), '@'))
 310                 FAIL(c, dti, node, "multiple '@' characters in node name");
 311 }
 312 ERROR(node_name_format, check_node_name_format, NULL, &node_name_chars);
 313
 314 static void check_unit_address_vs_reg(struct check *c, struct dt_info *dti,
 315                                       struct node *node)
 316 {
 317         const char *unitname = get_unitname(node);
 318         struct property *prop = get_property(node, "reg");
 319
 320         if (get_subnode(node, "__overlay__")) {
 321                 /* HACK: Overlay fragments are a special case */
 322                 return;
 323         }
 324
 325         if (!prop) {
 326                 prop = get_property(node, "ranges");
 327                 if (prop && !prop->val.len)
 328                         prop = NULL;
 329         }
 330
 331         if (prop) {
 332                 if (!unitname[0])
 333                         FAIL(c, dti, node, "node has a reg or ranges property, but no unit name");
 334         } else {
 335                 if (unitname[0])
 336                         FAIL(c, dti, node, "node has a unit name, but no reg property");
 337         }
 338 }
 339 WARNING(unit_address_vs_reg, check_unit_address_vs_reg, NULL);
 340
 341 static void check_property_name_chars(struct check *c, struct dt_info *dti,
 342                                       struct node *node)
 343 {
 344         struct property *prop;
 345
 346         for_each_property(node, prop) {
 347                 int n = strspn(prop->name, c->data);
 348
 349                 if (n < strlen(prop->name))
 350                         FAIL_PROP(c, dti, node, prop, "Bad character '%c' in property name",
 351                                   prop->name[n]);
 352         }
 353 }
 354 ERROR(property_name_chars, check_property_name_chars, PROPNODECHARS);
 355
 356 static void check_property_name_chars_strict(struct check *c,
 357                                              struct dt_info *dti,
 358                                              struct node *node)
 359 {
 360         struct property *prop;
 361
 362         for_each_property(node, prop) {
 363                 const char *name = prop->name;
 364                 int n = strspn(name, c->data);
 365
 366                 if (n == strlen(prop->name))
 367                         continue;
 368
 369                 /* Certain names are whitelisted */
 370                 if (streq(name, "device_type"))
 371                         continue;
 372
 373                 /*
 374                  * # is only allowed at the beginning of property names not counting
 375                  * the vendor prefix.
 376                  */
 377                 if (name[n] == '#' && ((n == 0) || (name[n-1] == ','))) {
 378                         name += n + 1;
 379                         n = strspn(name, c->data);
 380                 }
 381                 if (n < strlen(name))
 382                         FAIL_PROP(c, dti, node, prop, "Character '%c' not recommended in property name",
 383                                   name[n]);
 384         }
 385 }
 386 CHECK(property_name_chars_strict, check_property_name_chars_strict, PROPNODECHARSSTRICT);
 387
 388 #define DESCLABEL_FMT   "%s%s%s%s%s"
 389 #define DESCLABEL_ARGS(node,prop,mark)          \
 390         ((mark) ? "value of " : ""),            \
 391         ((prop) ? "'" : ""), \
 392         ((prop) ? (prop)->name : ""), \
 393         ((prop) ? "' in " : ""), (node)->fullpath
 394
 395 static void check_duplicate_label(struct check *c, struct dt_info *dti,
 396                                   const char *label, struct node *node,
 397                                   struct property *prop, struct marker *mark)
 398 {
 399         struct node *dt = dti->dt;
 400         struct node *othernode = NULL;
 401         struct property *otherprop = NULL;
 402         struct marker *othermark = NULL;
 403
 404         othernode = get_node_by_label(dt, label);
 405
 406         if (!othernode)
 407                 otherprop = get_property_by_label(dt, label, &othernode);
 408         if (!othernode)
 409                 othermark = get_marker_label(dt, label, &othernode,
 410                                                &otherprop);
 411
 412         if (!othernode)
 413                 return;
 414
 415         if ((othernode != node) || (otherprop != prop) || (othermark != mark))
 416                 FAIL(c, dti, node, "Duplicate label '%s' on " DESCLABEL_FMT
 417                      " and " DESCLABEL_FMT,
 418                      label, DESCLABEL_ARGS(node, prop, mark),
 419                      DESCLABEL_ARGS(othernode, otherprop, othermark));
 420 }
 421
 422 static void check_duplicate_label_node(struct check *c, struct dt_info *dti,
 423                                        struct node *node)
 424 {
 425         struct label *l;
 426         struct property *prop;
 427
 428         for_each_label(node->labels, l)
 429                 check_duplicate_label(c, dti, l->label, node, NULL, NULL);
 430
 431         for_each_property(node, prop) {
 432                 struct marker *m = prop->val.markers;
 433
 434                 for_each_label(prop->labels, l)
 435                         check_duplicate_label(c, dti, l->label, node, prop, NULL);
 436
 437                 for_each_marker_of_type(m, LABEL)
 438                         check_duplicate_label(c, dti, m->ref, node, prop, m);
 439         }
 440 }
 441 ERROR(duplicate_label, check_duplicate_label_node, NULL);
 442
 443 static cell_t check_phandle_prop(struct check *c, struct dt_info *dti,
 444                                  struct node *node, const char *propname)
 445 {
 446         struct node *root = dti->dt;
 447         struct property *prop;
 448         struct marker *m;
 449         cell_t phandle;
 450
 451         prop = get_property(node, propname);
 452         if (!prop)
 453                 return 0;
 454
 455         if (prop->val.len != sizeof(cell_t)) {
 456                 FAIL_PROP(c, dti, node, prop, "bad length (%d) %s property",
 457                           prop->val.len, prop->name);
 458                 return 0;
 459         }
 460
 461         m = prop->val.markers;
 462         for_each_marker_of_type(m, REF_PHANDLE) {
 463                 assert(m->offset == 0);
 464                 if (node != get_node_by_ref(root, m->ref))
 465                         /* "Set this node's phandle equal to some
 466                          * other node's phandle".  That's nonsensical
 467                          * by construction. */ {
 468                         FAIL(c, dti, node, "%s is a reference to another node",
 469                              prop->name);
 470                 }
 471                 /* But setting this node's phandle equal to its own
 472                  * phandle is allowed - that means allocate a unique
 473                  * phandle for this node, even if it's not otherwise
 474                  * referenced.  The value will be filled in later, so
 475                  * we treat it as having no phandle data for now. */
 476                 return 0;
 477         }
 478
 479         phandle = propval_cell(prop);
 480
 481         if ((phandle == 0) || (phandle == -1)) {
 482                 FAIL_PROP(c, dti, node, prop, "bad value (0x%x) in %s property",
 483                      phandle, prop->name);
 484                 return 0;
 485         }
 486
 487         return phandle;
 488 }
 489
 490 static void check_explicit_phandles(struct check *c, struct dt_info *dti,
 491                                     struct node *node)
 492 {
 493         struct node *root = dti->dt;
 494         struct node *other;
 495         cell_t phandle, linux_phandle;
 496
 497         /* Nothing should have assigned phandles yet */
 498         assert(!node->phandle);
 499
 500         phandle = check_phandle_prop(c, dti, node, "phandle");
 501
 502         linux_phandle = check_phandle_prop(c, dti, node, "linux,phandle");
 503
 504         if (!phandle && !linux_phandle)
 505                 /* No valid phandles; nothing further to check */
 506                 return;
 507
 508         if (linux_phandle && phandle && (phandle != linux_phandle))
 509                 FAIL(c, dti, node, "mismatching 'phandle' and 'linux,phandle'"
 510                      " properties");
 511
 512         if (linux_phandle && !phandle)
 513                 phandle = linux_phandle;
 514
 515         other = get_node_by_phandle(root, phandle);
 516         if (other && (other != node)) {
 517                 FAIL(c, dti, node, "duplicated phandle 0x%x (seen before at %s)",
 518                      phandle, other->fullpath);
 519                 return;
 520         }
 521
 522         node->phandle = phandle;
 523 }
 524 ERROR(explicit_phandles, check_explicit_phandles, NULL);
 525
 526 static void check_name_properties(struct check *c, struct dt_info *dti,
 527                                   struct node *node)
 528 {
 529         struct property **pp, *prop = NULL;
 530
 531         for (pp = &node->proplist; *pp; pp = &((*pp)->next))
 532                 if (streq((*pp)->name, "name")) {
 533                         prop = *pp;
 534                         break;
 535                 }
 536
 537         if (!prop)
 538                 return; /* No name property, that's fine */
 539
 540         if ((prop->val.len != node->basenamelen+1)
 541             || (memcmp(prop->val.val, node->name, node->basenamelen) != 0)) {
 542                 FAIL(c, dti, node, "\"name\" property is incorrect (\"%s\" instead"
 543                      " of base node name)", prop->val.val);
 544         } else {
 545                 /* The name property is correct, and therefore redundant.
 546                  * Delete it */
 547                 *pp = prop->next;
 548                 free(prop->name);
 549                 data_free(prop->val);
 550                 free(prop);
 551         }
 552 }
 553 ERROR_IF_NOT_STRING(name_is_string, "name");
 554 ERROR(name_properties, check_name_properties, NULL, &name_is_string);
 555
 556 /*
 557  * Reference fixup functions
 558  */
 559
 560 static void fixup_phandle_references(struct check *c, struct dt_info *dti,
 561                                      struct node *node)
 562 {
 563         struct node *dt = dti->dt;
 564         struct property *prop;
 565
 566         for_each_property(node, prop) {
 567                 struct marker *m = prop->val.markers;
 568                 struct node *refnode;
 569                 cell_t phandle;
 570
 571                 for_each_marker_of_type(m, REF_PHANDLE) {
 572                         assert(m->offset + sizeof(cell_t) <= prop->val.len);
 573
 574                         refnode = get_node_by_ref(dt, m->ref);
 575                         if (! refnode) {
 576                                 if (!(dti->dtsflags & DTSF_PLUGIN))
 577                                         FAIL(c, dti, node, "Reference to non-existent node or "
 578                                                         "label \"%s\"\n", m->ref);
 579                                 else /* mark the entry as unresolved */
 580                                         *((fdt32_t *)(prop->val.val + m->offset)) =
 581                                                 cpu_to_fdt32(0xffffffff);
 582                                 continue;
 583                         }
 584
 585                         phandle = get_node_phandle(dt, refnode);
 586                         *((fdt32_t *)(prop->val.val + m->offset)) = cpu_to_fdt32(phandle);
 587
 588                         reference_node(refnode);
 589                 }
 590         }
 591 }
 592 ERROR(phandle_references, fixup_phandle_references, NULL,
 593       &duplicate_node_names, &explicit_phandles);
 594
 595 static void fixup_path_references(struct check *c, struct dt_info *dti,
 596                                   struct node *node)
 597 {
 598         struct node *dt = dti->dt;
 599         struct property *prop;
 600
 601         for_each_property(node, prop) {
 602                 struct marker *m = prop->val.markers;
 603                 struct node *refnode;
 604                 char *path;
 605
 606                 for_each_marker_of_type(m, REF_PATH) {
 607                         assert(m->offset <= prop->val.len);
 608
 609                         refnode = get_node_by_ref(dt, m->ref);
 610                         if (!refnode) {
 611                                 FAIL(c, dti, node, "Reference to non-existent node or label \"%s\"\n",
 612                                      m->ref);
 613                                 continue;
 614                         }
 615
 616                         path = refnode->fullpath;
 617                         prop->val = data_insert_at_marker(prop->val, m, path,
 618                                                           strlen(path) + 1);
 619
 620                         reference_node(refnode);
 621                 }
 622         }
 623 }
 624 ERROR(path_references, fixup_path_references, NULL, &duplicate_node_names);
 625
 626 static void fixup_omit_unused_nodes(struct check *c, struct dt_info *dti,
 627                                     struct node *node)
 628 {
 629         if (node->omit_if_unused && !node->is_referenced)
 630                 delete_node(node);
 631 }
 632 ERROR(omit_unused_nodes, fixup_omit_unused_nodes, NULL, &phandle_references, &path_references);
 633
 634 /*
 635  * Semantic checks
 636  */
 637 WARNING_IF_NOT_CELL(address_cells_is_cell, "#address-cells");
 638 WARNING_IF_NOT_CELL(size_cells_is_cell, "#size-cells");
 639 WARNING_IF_NOT_CELL(interrupt_cells_is_cell, "#interrupt-cells");
 640
 641 WARNING_IF_NOT_STRING(device_type_is_string, "device_type");
 642 WARNING_IF_NOT_STRING(model_is_string, "model");
 643 WARNING_IF_NOT_STRING(status_is_string, "status");
 644 WARNING_IF_NOT_STRING(label_is_string, "label");
 645
 646 WARNING_IF_NOT_STRING_LIST(compatible_is_string_list, "compatible");
 647
 648 static void check_names_is_string_list(struct check *c, struct dt_info *dti,
 649                                        struct node *node)
 650 {
 651         struct property *prop;
 652
 653         for_each_property(node, prop) {
 654                 const char *s = strrchr(prop->name, '-');
 655                 if (!s || !streq(s, "-names"))
 656                         continue;
 657
 658                 c->data = prop->name;
 659                 check_is_string_list(c, dti, node);
 660         }
 661 }
 662 WARNING(names_is_string_list, check_names_is_string_list, NULL);
 663
 664 static void check_alias_paths(struct check *c, struct dt_info *dti,
 665                                     struct node *node)
 666 {
 667         struct property *prop;
 668
 669         if (!streq(node->name, "aliases"))
 670                 return;
 671
 672         for_each_property(node, prop) {
 673                 if (!prop->val.val || !get_node_by_path(dti->dt, prop->val.val)) {
 674                         FAIL_PROP(c, dti, node, prop, "aliases property is not a valid node (%s)",
 675                                   prop->val.val);
 676                         continue;
 677                 }
 678                 if (strspn(prop->name, LOWERCASE DIGITS "-") != strlen(prop->name))
 679                         FAIL(c, dti, node, "aliases property name must include only lowercase and '-'");
 680         }
 681 }
 682 WARNING(alias_paths, check_alias_paths, NULL);
 683
 684 static void fixup_addr_size_cells(struct check *c, struct dt_info *dti,
 685                                   struct node *node)
 686 {
 687         struct property *prop;
 688
 689         node->addr_cells = -1;
 690         node->size_cells = -1;
 691
 692         prop = get_property(node, "#address-cells");
 693         if (prop)
 694                 node->addr_cells = propval_cell(prop);
 695
 696         prop = get_property(node, "#size-cells");
 697         if (prop)
 698                 node->size_cells = propval_cell(prop);
 699 }
 700 WARNING(addr_size_cells, fixup_addr_size_cells, NULL,
 701         &address_cells_is_cell, &size_cells_is_cell);
 702
 703 #define node_addr_cells(n) \
 704         (((n)->addr_cells == -1) ? 2 : (n)->addr_cells)
 705 #define node_size_cells(n) \
 706         (((n)->size_cells == -1) ? 1 : (n)->size_cells)
 707
 708 static void check_reg_format(struct check *c, struct dt_info *dti,
 709                              struct node *node)
 710 {
 711         struct property *prop;
 712         int addr_cells, size_cells, entrylen;
 713
 714         prop = get_property(node, "reg");
 715         if (!prop)
 716                 return; /* No "reg", that's fine */
 717
 718         if (!node->parent) {
 719                 FAIL(c, dti, node, "Root node has a \"reg\" property");
 720                 return;
 721         }
 722
 723         if (prop->val.len == 0)
 724                 FAIL_PROP(c, dti, node, prop, "property is empty");
 725
 726         addr_cells = node_addr_cells(node->parent);
 727         size_cells = node_size_cells(node->parent);
 728         entrylen = (addr_cells + size_cells) * sizeof(cell_t);
 729
 730         if (!entrylen || (prop->val.len % entrylen) != 0)
 731                 FAIL_PROP(c, dti, node, prop, "property has invalid length (%d bytes) "
 732                           "(#address-cells == %d, #size-cells == %d)",
 733                           prop->val.len, addr_cells, size_cells);
 734 }
 735 WARNING(reg_format, check_reg_format, NULL, &addr_size_cells);
 736
 737 static void check_ranges_format(struct check *c, struct dt_info *dti,
 738                                 struct node *node)
 739 {
 740         struct property *prop;
 741         int c_addr_cells, p_addr_cells, c_size_cells, p_size_cells, entrylen;
 742
 743         prop = get_property(node, "ranges");
 744         if (!prop)
 745                 return;
 746
 747         if (!node->parent) {
 748                 FAIL_PROP(c, dti, node, prop, "Root node has a \"ranges\" property");
 749                 return;
 750         }
 751
 752         p_addr_cells = node_addr_cells(node->parent);
 753         p_size_cells = node_size_cells(node->parent);
 754         c_addr_cells = node_addr_cells(node);
 755         c_size_cells = node_size_cells(node);
 756         entrylen = (p_addr_cells + c_addr_cells + c_size_cells) * sizeof(cell_t);
 757
 758         if (prop->val.len == 0) {
 759                 if (p_addr_cells != c_addr_cells)
 760                         FAIL_PROP(c, dti, node, prop, "empty \"ranges\" property but its "
 761                                   "#address-cells (%d) differs from %s (%d)",
 762                                   c_addr_cells, node->parent->fullpath,
 763                                   p_addr_cells);
 764                 if (p_size_cells != c_size_cells)
 765                         FAIL_PROP(c, dti, node, prop, "empty \"ranges\" property but its "
 766                                   "#size-cells (%d) differs from %s (%d)",
 767                                   c_size_cells, node->parent->fullpath,
 768                                   p_size_cells);
 769         } else if ((prop->val.len % entrylen) != 0) {
 770                 FAIL_PROP(c, dti, node, prop, "\"ranges\" property has invalid length (%d bytes) "
 771                           "(parent #address-cells == %d, child #address-cells == %d, "
 772                           "#size-cells == %d)", prop->val.len,
 773                           p_addr_cells, c_addr_cells, c_size_cells);
 774         }
 775 }
 776 WARNING(ranges_format, check_ranges_format, NULL, &addr_size_cells);
 777
 778 static const struct bus_type pci_bus = {
 779         .name = "PCI",
 780 };
 781
 782 static void check_pci_bridge(struct check *c, struct dt_info *dti, struct node *node)
 783 {
 784         struct property *prop;
 785         cell_t *cells;
 786
 787         prop = get_property(node, "device_type");
 788         if (!prop || !streq(prop->val.val, "pci"))
 789                 return;
 790
 791         node->bus = &pci_bus;
 792
 793         if (!strprefixeq(node->name, node->basenamelen, "pci") &&
 794             !strprefixeq(node->name, node->basenamelen, "pcie"))
 795                 FAIL(c, dti, node, "node name is not \"pci\" or \"pcie\"");
 796
 797         prop = get_property(node, "ranges");
 798         if (!prop)
 799                 FAIL(c, dti, node, "missing ranges for PCI bridge (or not a bridge)");
 800
 801         if (node_addr_cells(node) != 3)
 802                 FAIL(c, dti, node, "incorrect #address-cells for PCI bridge");
 803         if (node_size_cells(node) != 2)
 804                 FAIL(c, dti, node, "incorrect #size-cells for PCI bridge");
 805
 806         prop = get_property(node, "bus-range");
 807         if (!prop) {
 808                 FAIL(c, dti, node, "missing bus-range for PCI bridge");
 809                 return;
 810         }
 811         if (prop->val.len != (sizeof(cell_t) * 2)) {
 812                 FAIL_PROP(c, dti, node, prop, "value must be 2 cells");
 813                 return;
 814         }
 815         cells = (cell_t *)prop->val.val;
 816         if (fdt32_to_cpu(cells[0]) > fdt32_to_cpu(cells[1]))
 817                 FAIL_PROP(c, dti, node, prop, "1st cell must be less than or equal to 2nd cell");
 818         if (fdt32_to_cpu(cells[1]) > 0xff)
 819                 FAIL_PROP(c, dti, node, prop, "maximum bus number must be less than 256");
 820 }
 821 WARNING(pci_bridge, check_pci_bridge, NULL,
 822         &device_type_is_string, &addr_size_cells);
 823
 824 static void check_pci_device_bus_num(struct check *c, struct dt_info *dti, struct node *node)
 825 {
 826         struct property *prop;
 827         unsigned int bus_num, min_bus, max_bus;
 828         cell_t *cells;
 829
 830         if (!node->parent || (node->parent->bus != &pci_bus))
 831                 return;
 832
 833         prop = get_property(node, "reg");
 834         if (!prop)
 835                 return;
 836
 837         cells = (cell_t *)prop->val.val;
 838         bus_num = (fdt32_to_cpu(cells[0]) & 0x00ff0000) >> 16;
 839
 840         prop = get_property(node->parent, "bus-range");
 841         if (!prop) {
 842                 min_bus = max_bus = 0;
 843         } else {
 844                 cells = (cell_t *)prop->val.val;
 845                 min_bus = fdt32_to_cpu(cells[0]);
 846                 max_bus = fdt32_to_cpu(cells[0]);
 847         }
 848         if ((bus_num < min_bus) || (bus_num > max_bus))
 849                 FAIL_PROP(c, dti, node, prop, "PCI bus number %d out of range, expected (%d - %d)",
 850                           bus_num, min_bus, max_bus);
 851 }
 852 WARNING(pci_device_bus_num, check_pci_device_bus_num, NULL, &reg_format, &pci_bridge);
 853
 854 static void check_pci_device_reg(struct check *c, struct dt_info *dti, struct node *node)
 855 {
 856         struct property *prop;
 857         const char *unitname = get_unitname(node);
 858         char unit_addr[5];
 859         unsigned int dev, func, reg;
 860         cell_t *cells;
 861
 862         if (!node->parent || (node->parent->bus != &pci_bus))
 863                 return;
 864
 865         prop = get_property(node, "reg");
 866         if (!prop) {
 867                 FAIL(c, dti, node, "missing PCI reg property");
 868                 return;
 869         }
 870
 871         cells = (cell_t *)prop->val.val;
 872         if (cells[1] || cells[2])
 873                 FAIL_PROP(c, dti, node, prop, "PCI reg config space address cells 2 and 3 must be 0");
 874
 875         reg = fdt32_to_cpu(cells[0]);
 876         dev = (reg & 0xf800) >> 11;
 877         func = (reg & 0x700) >> 8;
 878
 879         if (reg & 0xff000000)
 880                 FAIL_PROP(c, dti, node, prop, "PCI reg address is not configuration space");
 881         if (reg & 0x000000ff)
 882                 FAIL_PROP(c, dti, node, prop, "PCI reg config space address register number must be 0");
 883
 884         if (func == 0) {
 885                 snprintf(unit_addr, sizeof(unit_addr), "%x", dev);
 886                 if (streq(unitname, unit_addr))
 887                         return;
 888         }
 889
 890         snprintf(unit_addr, sizeof(unit_addr), "%x,%x", dev, func);
 891         if (streq(unitname, unit_addr))
 892                 return;
 893
 894         FAIL(c, dti, node, "PCI unit address format error, expected \"%s\"",
 895              unit_addr);
 896 }
 897 WARNING(pci_device_reg, check_pci_device_reg, NULL, &reg_format, &pci_bridge);
 898
 899 static const struct bus_type simple_bus = {
 900         .name = "simple-bus",
 901 };
 902
 903 static bool node_is_compatible(struct node *node, const char *compat)
 904 {
 905         struct property *prop;
 906         const char *str, *end;
 907
 908         prop = get_property(node, "compatible");
 909         if (!prop)
 910                 return false;
 911
 912         for (str = prop->val.val, end = str + prop->val.len; str < end;
 913              str += strnlen(str, end - str) + 1) {
 914                 if (strprefixeq(str, end - str, compat))
 915                         return true;
 916         }
 917         return false;
 918 }
 919
 920 static void check_simple_bus_bridge(struct check *c, struct dt_info *dti, struct node *node)
 921 {
 922         if (node_is_compatible(node, "simple-bus"))
 923                 node->bus = &simple_bus;
 924 }
 925 WARNING(simple_bus_bridge, check_simple_bus_bridge, NULL, &addr_size_cells);
 926
 927 static void check_simple_bus_reg(struct check *c, struct dt_info *dti, struct node *node)
 928 {
 929         struct property *prop;
 930         const char *unitname = get_unitname(node);
 931         char unit_addr[17];
 932         unsigned int size;
 933         uint64_t reg = 0;
 934         cell_t *cells = NULL;
 935
 936         if (!node->parent || (node->parent->bus != &simple_bus))
 937                 return;
 938
 939         prop = get_property(node, "reg");
 940         if (prop)
 941                 cells = (cell_t *)prop->val.val;
 942         else {
 943                 prop = get_property(node, "ranges");
 944                 if (prop && prop->val.len)
 945                         /* skip of child address */
 946                         cells = ((cell_t *)prop->val.val) + node_addr_cells(node);
 947         }
 948
 949         if (!cells) {
 950                 if (node->parent->parent && !(node->bus == &simple_bus))
 951                         FAIL(c, dti, node, "missing or empty reg/ranges property");
 952                 return;
 953         }
 954
 955         size = node_addr_cells(node->parent);
 956         while (size--)
 957                 reg = (reg << 32) | fdt32_to_cpu(*(cells++));
 958
 959         snprintf(unit_addr, sizeof(unit_addr), "%"PRIx64, reg);
 960         if (!streq(unitname, unit_addr))
 961                 FAIL(c, dti, node, "simple-bus unit address format error, expected \"%s\"",
 962                      unit_addr);
 963 }
 964 WARNING(simple_bus_reg, check_simple_bus_reg, NULL, &reg_format, &simple_bus_bridge);
 965
 966 static void check_unit_address_format(struct check *c, struct dt_info *dti,
 967                                       struct node *node)
 968 {
 969         const char *unitname = get_unitname(node);
 970
 971         if (node->parent && node->parent->bus)
 972                 return;
 973
 974         if (!unitname[0])
 975                 return;
 976
 977         if (!strncmp(unitname, "0x", 2)) {
 978                 FAIL(c, dti, node, "unit name should not have leading \"0x\"");
 979                 /* skip over 0x for next test */
 980                 unitname += 2;
 981         }
 982         if (unitname[0] == '0' && isxdigit(unitname[1]))
 983                 FAIL(c, dti, node, "unit name should not have leading 0s");
 984 }
 985 WARNING(unit_address_format, check_unit_address_format, NULL,
 986         &node_name_format, &pci_bridge, &simple_bus_bridge);
 987
 988 /*
 989  * Style checks
 990  */
 991 static void check_avoid_default_addr_size(struct check *c, struct dt_info *dti,
 992                                           struct node *node)
 993 {
 994         struct property *reg, *ranges;
 995
 996         if (!node->parent)
 997                 return; /* Ignore root node */
 998
 999         reg = get_property(node, "reg");
1000         ranges = get_property(node, "ranges");
1001
1002         if (!reg && !ranges)
1003                 return;
1004
1005         if (node->parent->addr_cells == -1)
1006                 FAIL(c, dti, node, "Relying on default #address-cells value");
1007
1008         if (node->parent->size_cells == -1)
1009                 FAIL(c, dti, node, "Relying on default #size-cells value");
1010 }
1011 WARNING(avoid_default_addr_size, check_avoid_default_addr_size, NULL,
1012         &addr_size_cells);
1013
1014 static void check_avoid_unnecessary_addr_size(struct check *c, struct dt_info *dti,
1015                                               struct node *node)
1016 {
1017         struct property *prop;
1018         struct node *child;
1019         bool has_reg = false;
1020
1021         if (!node->parent || node->addr_cells < 0 || node->size_cells < 0)
1022                 return;
1023
1024         if (get_property(node, "ranges") || !node->children)
1025                 return;
1026
1027         for_each_child(node, child) {
1028                 prop = get_property(child, "reg");
1029                 if (prop)
1030                         has_reg = true;
1031         }
1032
1033         if (!has_reg)
1034                 FAIL(c, dti, node, "unnecessary #address-cells/#size-cells without \"ranges\" or child \"reg\" property");
1035 }
1036 WARNING(avoid_unnecessary_addr_size, check_avoid_unnecessary_addr_size, NULL, &avoid_default_addr_size);
1037
1038 static void check_unique_unit_address(struct check *c, struct dt_info *dti,
1039                                               struct node *node)
1040 {
1041         struct node *childa;
1042
1043         if (node->addr_cells < 0 || node->size_cells < 0)
1044                 return;
1045
1046         if (!node->children)
1047                 return;
1048
1049         for_each_child(node, childa) {
1050                 struct node *childb;
1051                 const char *addr_a = get_unitname(childa);
1052
1053                 if (!strlen(addr_a))
1054                         continue;
1055
1056                 for_each_child(node, childb) {
1057                         const char *addr_b = get_unitname(childb);
1058                         if (childa == childb)
1059                                 break;
1060
1061                         if (streq(addr_a, addr_b))
1062                                 FAIL(c, dti, childb, "duplicate unit-address (also used in node %s)", childa->fullpath);
1063                 }
1064         }
1065 }
1066 WARNING(unique_unit_address, check_unique_unit_address, NULL, &avoid_default_addr_size);
1067
1068 static void check_obsolete_chosen_interrupt_controller(struct check *c,
1069                                                        struct dt_info *dti,
1070                                                        struct node *node)
1071 {
1072         struct node *dt = dti->dt;
1073         struct node *chosen;
1074         struct property *prop;
1075
1076         if (node != dt)
1077                 return;
1078
1079
1080         chosen = get_node_by_path(dt, "/chosen");
1081         if (!chosen)
1082                 return;
1083
1084         prop = get_property(chosen, "interrupt-controller");
1085         if (prop)
1086                 FAIL_PROP(c, dti, node, prop,
1087                           "/chosen has obsolete \"interrupt-controller\" property");
1088 }
1089 WARNING(obsolete_chosen_interrupt_controller,
1090         check_obsolete_chosen_interrupt_controller, NULL);
1091
1092 static void check_chosen_node_is_root(struct check *c, struct dt_info *dti,
1093                                       struct node *node)
1094 {
1095         if (!streq(node->name, "chosen"))
1096                 return;
1097
1098         if (node->parent != dti->dt)
1099                 FAIL(c, dti, node, "chosen node must be at root node");
1100 }
1101 WARNING(chosen_node_is_root, check_chosen_node_is_root, NULL);
1102
1103 static void check_chosen_node_bootargs(struct check *c, struct dt_info *dti,
1104                                        struct node *node)
1105 {
1106         struct property *prop;
1107
1108         if (!streq(node->name, "chosen"))
1109                 return;
1110
1111         prop = get_property(node, "bootargs");
1112         if (!prop)
1113                 return;
1114
1115         c->data = prop->name;
1116         check_is_string(c, dti, node);
1117 }
1118 WARNING(chosen_node_bootargs, check_chosen_node_bootargs, NULL);
1119
1120 static void check_chosen_node_stdout_path(struct check *c, struct dt_info *dti,
1121                                           struct node *node)
1122 {
1123         struct property *prop;
1124
1125         if (!streq(node->name, "chosen"))
1126                 return;
1127
1128         prop = get_property(node, "stdout-path");
1129         if (!prop) {
1130                 prop = get_property(node, "linux,stdout-path");
1131                 if (!prop)
1132                         return;
1133                 FAIL_PROP(c, dti, node, prop, "Use 'stdout-path' instead");
1134         }
1135
1136         c->data = prop->name;
1137         check_is_string(c, dti, node);
1138 }
1139 WARNING(chosen_node_stdout_path, check_chosen_node_stdout_path, NULL);
1140
1141 struct provider {
1142         const char *prop_name;
1143         const char *cell_name;
1144         bool optional;
1145 };
1146
1147 static void check_property_phandle_args(struct check *c,
1148                                           struct dt_info *dti,
1149                                           struct node *node,
1150                                           struct property *prop,
1151                                           const struct provider *provider)
1152 {
1153         struct node *root = dti->dt;
1154         int cell, cellsize = 0;
1155
1156         if (prop->val.len % sizeof(cell_t)) {
1157                 FAIL_PROP(c, dti, node, prop,
1158                           "property size (%d) is invalid, expected multiple of %zu",
1159                           prop->val.len, sizeof(cell_t));
1160                 return;
1161         }
1162
1163         for (cell = 0; cell < prop->val.len / sizeof(cell_t); cell += cellsize + 1) {
1164                 struct node *provider_node;
1165                 struct property *cellprop;
1166                 int phandle;
1167
1168                 phandle = propval_cell_n(prop, cell);
1169                 /*
1170                  * Some bindings use a cell value 0 or -1 to skip over optional
1171                  * entries when each index position has a specific definition.
1172                  */
1173                 if (phandle == 0 || phandle == -1) {
1174                         /* Give up if this is an overlay with external references */
1175                         if (dti->dtsflags & DTSF_PLUGIN)
1176                                 break;
1177
1178                         cellsize = 0;
1179                         continue;
1180                 }
1181
1182                 /* If we have markers, verify the current cell is a phandle */
1183                 if (prop->val.markers) {
1184                         struct marker *m = prop->val.markers;
1185                         for_each_marker_of_type(m, REF_PHANDLE) {
1186                                 if (m->offset == (cell * sizeof(cell_t)))
1187                                         break;
1188                         }
1189                         if (!m)
1190                                 FAIL_PROP(c, dti, node, prop,
1191                                           "cell %d is not a phandle reference",
1192                                           cell);
1193                 }
1194
1195                 provider_node = get_node_by_phandle(root, phandle);
1196                 if (!provider_node) {
1197                         FAIL_PROP(c, dti, node, prop,
1198                                   "Could not get phandle node for (cell %d)",
1199                                   cell);
1200                         break;
1201                 }
1202
1203                 cellprop = get_property(provider_node, provider->cell_name);
1204                 if (cellprop) {
1205                         cellsize = propval_cell(cellprop);
1206                 } else if (provider->optional) {
1207                         cellsize = 0;
1208                 } else {
1209                         FAIL(c, dti, node, "Missing property '%s' in node %s or bad phandle (referred from %s[%d])",
1210                              provider->cell_name,
1211                              provider_node->fullpath,
1212                              prop->name, cell);
1213                         break;
1214                 }
1215
1216                 if (prop->val.len < ((cell + cellsize + 1) * sizeof(cell_t))) {
1217                         FAIL_PROP(c, dti, node, prop,
1218                                   "property size (%d) too small for cell size %d",
1219                                   prop->val.len, cellsize);
1220                 }
1221         }
1222 }
1223
1224 static void check_provider_cells_property(struct check *c,
1225                                           struct dt_info *dti,
1226                                           struct node *node)
1227 {
1228         struct provider *provider = c->data;
1229         struct property *prop;
1230
1231         prop = get_property(node, provider->prop_name);
1232         if (!prop)
1233                 return;
1234
1235         check_property_phandle_args(c, dti, node, prop, provider);
1236 }
1237 #define WARNING_PROPERTY_PHANDLE_CELLS(nm, propname, cells_name, ...) \
1238         static struct provider nm##_provider = { (propname), (cells_name), __VA_ARGS__ }; \
1239         WARNING(nm##_property, check_provider_cells_property, &nm##_provider, &phandle_references);
1240
1241 WARNING_PROPERTY_PHANDLE_CELLS(clocks, "clocks", "#clock-cells");
1242 WARNING_PROPERTY_PHANDLE_CELLS(cooling_device, "cooling-device", "#cooling-cells");
1243 WARNING_PROPERTY_PHANDLE_CELLS(dmas, "dmas", "#dma-cells");
1244 WARNING_PROPERTY_PHANDLE_CELLS(hwlocks, "hwlocks", "#hwlock-cells");
1245 WARNING_PROPERTY_PHANDLE_CELLS(interrupts_extended, "interrupts-extended", "#interrupt-cells");
1246 WARNING_PROPERTY_PHANDLE_CELLS(io_channels, "io-channels", "#io-channel-cells");
1247 WARNING_PROPERTY_PHANDLE_CELLS(iommus, "iommus", "#iommu-cells");
1248 WARNING_PROPERTY_PHANDLE_CELLS(mboxes, "mboxes", "#mbox-cells");
1249 WARNING_PROPERTY_PHANDLE_CELLS(msi_parent, "msi-parent", "#msi-cells", true);
1250 WARNING_PROPERTY_PHANDLE_CELLS(mux_controls, "mux-controls", "#mux-control-cells");
1251 WARNING_PROPERTY_PHANDLE_CELLS(phys, "phys", "#phy-cells");
1252 WARNING_PROPERTY_PHANDLE_CELLS(power_domains, "power-domains", "#power-domain-cells");
1253 WARNING_PROPERTY_PHANDLE_CELLS(pwms, "pwms", "#pwm-cells");
1254 WARNING_PROPERTY_PHANDLE_CELLS(resets, "resets", "#reset-cells");
1255 WARNING_PROPERTY_PHANDLE_CELLS(sound_dai, "sound-dai", "#sound-dai-cells");
1256 WARNING_PROPERTY_PHANDLE_CELLS(thermal_sensors, "thermal-sensors", "#thermal-sensor-cells");
1257
1258 static bool prop_is_gpio(struct property *prop)
1259 {
1260         char *str;
1261
1262         /*
1263          * *-gpios and *-gpio can appear in property names,
1264          * so skip over any false matches (only one known ATM)
1265          */
1266         if (strstr(prop->name, "nr-gpio"))
1267                 return false;
1268
1269         str = strrchr(prop->name, '-');
1270         if (str)
1271                 str++;
1272         else
1273                 str = prop->name;
1274         if (!(streq(str, "gpios") || streq(str, "gpio")))
1275                 return false;
1276
1277         return true;
1278 }
1279
1280 static void check_gpios_property(struct check *c,
1281                                           struct dt_info *dti,
1282                                           struct node *node)
1283 {
1284         struct property *prop;
1285
1286         /* Skip GPIO hog nodes which have 'gpios' property */
1287         if (get_property(node, "gpio-hog"))
1288                 return;
1289
1290         for_each_property(node, prop) {
1291                 struct provider provider;
1292
1293                 if (!prop_is_gpio(prop))
1294                         continue;
1295
1296                 provider.prop_name = prop->name;
1297                 provider.cell_name = "#gpio-cells";
1298                 provider.optional = false;
1299                 check_property_phandle_args(c, dti, node, prop, &provider);
1300         }
1301
1302 }
1303 WARNING(gpios_property, check_gpios_property, NULL, &phandle_references);
1304
1305 static void check_deprecated_gpio_property(struct check *c,
1306                                            struct dt_info *dti,
1307                                            struct node *node)
1308 {
1309         struct property *prop;
1310
1311         for_each_property(node, prop) {
1312                 char *str;
1313
1314                 if (!prop_is_gpio(prop))
1315                         continue;
1316
1317                 str = strstr(prop->name, "gpio");
1318                 if (!streq(str, "gpio"))
1319                         continue;
1320
1321                 FAIL_PROP(c, dti, node, prop,
1322                           "'[*-]gpio' is deprecated, use '[*-]gpios' instead");
1323         }
1324
1325 }
1326 CHECK(deprecated_gpio_property, check_deprecated_gpio_property, NULL);
1327
1328 static bool node_is_interrupt_provider(struct node *node)
1329 {
1330         struct property *prop;
1331
1332         prop = get_property(node, "interrupt-controller");
1333         if (prop)
1334                 return true;
1335
1336         prop = get_property(node, "interrupt-map");
1337         if (prop)
1338                 return true;
1339
1340         return false;
1341 }
1342 static void check_interrupts_property(struct check *c,
1343                                       struct dt_info *dti,
1344                                       struct node *node)
1345 {
1346         struct node *root = dti->dt;
1347         struct node *irq_node = NULL, *parent = node;
1348         struct property *irq_prop, *prop = NULL;
1349         int irq_cells, phandle;
1350
1351         irq_prop = get_property(node, "interrupts");
1352         if (!irq_prop)
1353                 return;
1354
1355         if (irq_prop->val.len % sizeof(cell_t))
1356                 FAIL_PROP(c, dti, node, irq_prop, "size (%d) is invalid, expected multiple of %zu",
1357                      irq_prop->val.len, sizeof(cell_t));
1358
1359         while (parent && !prop) {
1360                 if (parent != node && node_is_interrupt_provider(parent)) {
1361                         irq_node = parent;
1362                         break;
1363                 }
1364
1365                 prop = get_property(parent, "interrupt-parent");
1366                 if (prop) {
1367                         phandle = propval_cell(prop);
1368                         /* Give up if this is an overlay with external references */
1369                         if ((phandle == 0 || phandle == -1) &&
1370                             (dti->dtsflags & DTSF_PLUGIN))
1371                                         return;
1372
1373                         irq_node = get_node_by_phandle(root, phandle);
1374                         if (!irq_node) {
1375                                 FAIL_PROP(c, dti, parent, prop, "Bad phandle");
1376                                 return;
1377                         }
1378                         if (!node_is_interrupt_provider(irq_node))
1379                                 FAIL(c, dti, irq_node,
1380                                      "Missing interrupt-controller or interrupt-map property");
1381
1382                         break;
1383                 }
1384
1385                 parent = parent->parent;
1386         }
1387
1388         if (!irq_node) {
1389                 FAIL(c, dti, node, "Missing interrupt-parent");
1390                 return;
1391         }
1392
1393         prop = get_property(irq_node, "#interrupt-cells");
1394         if (!prop) {
1395                 FAIL(c, dti, irq_node, "Missing #interrupt-cells in interrupt-parent");
1396                 return;
1397         }
1398
1399         irq_cells = propval_cell(prop);
1400         if (irq_prop->val.len % (irq_cells * sizeof(cell_t))) {
1401                 FAIL_PROP(c, dti, node, prop,
1402                           "size is (%d), expected multiple of %d",
1403                           irq_prop->val.len, (int)(irq_cells * sizeof(cell_t)));
1404         }
1405 }
1406 WARNING(interrupts_property, check_interrupts_property, &phandle_references);
1407
1408 static const struct bus_type graph_port_bus = {
1409         .name = "graph-port",
1410 };
1411
1412 static const struct bus_type graph_ports_bus = {
1413         .name = "graph-ports",
1414 };
1415
1416 static void check_graph_nodes(struct check *c, struct dt_info *dti,
1417                               struct node *node)
1418 {
1419         struct node *child;
1420
1421         for_each_child(node, child) {
1422                 if (!(strprefixeq(child->name, child->basenamelen, "endpoint") ||
1423                       get_property(child, "remote-endpoint")))
1424                         continue;
1425
1426                 node->bus = &graph_port_bus;
1427
1428                 /* The parent of 'port' nodes can be either 'ports' or a device */
1429                 if (!node->parent->bus &&
1430                     (streq(node->parent->name, "ports") || get_property(node, "reg")))
1431                         node->parent->bus = &graph_ports_bus;
1432
1433                 break;
1434         }
1435
1436 }
1437 WARNING(graph_nodes, check_graph_nodes, NULL);
1438
1439 static void check_graph_child_address(struct check *c, struct dt_info *dti,
1440                                       struct node *node)
1441 {
1442         int cnt = 0;
1443         struct node *child;
1444
1445         if (node->bus != &graph_ports_bus && node->bus != &graph_port_bus)
1446                 return;
1447
1448         for_each_child(node, child) {
1449                 struct property *prop = get_property(child, "reg");
1450
1451                 /* No error if we have any non-zero unit address */
1452                 if (prop && propval_cell(prop) != 0)
1453                         return;
1454
1455                 cnt++;
1456         }
1457
1458         if (cnt == 1 && node->addr_cells != -1)
1459                 FAIL(c, dti, node, "graph node has single child node '%s', #address-cells/#size-cells are not necessary",
1460                      node->children->name);
1461 }
1462 WARNING(graph_child_address, check_graph_child_address, NULL, &graph_nodes);
1463
1464 static void check_graph_reg(struct check *c, struct dt_info *dti,
1465                             struct node *node)
1466 {
1467         char unit_addr[9];
1468         const char *unitname = get_unitname(node);
1469         struct property *prop;
1470
1471         prop = get_property(node, "reg");
1472         if (!prop || !unitname)
1473                 return;
1474
1475         if (!(prop->val.val && prop->val.len == sizeof(cell_t))) {
1476                 FAIL(c, dti, node, "graph node malformed 'reg' property");
1477                 return;
1478         }
1479
1480         snprintf(unit_addr, sizeof(unit_addr), "%x", propval_cell(prop));
1481         if (!streq(unitname, unit_addr))
1482                 FAIL(c, dti, node, "graph node unit address error, expected \"%s\"",
1483                      unit_addr);
1484
1485         if (node->parent->addr_cells != 1)
1486                 FAIL_PROP(c, dti, node, get_property(node, "#address-cells"),
1487                           "graph node '#address-cells' is %d, must be 1",
1488                           node->parent->addr_cells);
1489         if (node->parent->size_cells != 0)
1490                 FAIL_PROP(c, dti, node, get_property(node, "#size-cells"),
1491                           "graph node '#size-cells' is %d, must be 0",
1492                           node->parent->size_cells);
1493 }
1494
1495 static void check_graph_port(struct check *c, struct dt_info *dti,
1496                              struct node *node)
1497 {
1498         if (node->bus != &graph_port_bus)
1499                 return;
1500
1501         if (!strprefixeq(node->name, node->basenamelen, "port"))
1502                 FAIL(c, dti, node, "graph port node name should be 'port'");
1503
1504         check_graph_reg(c, dti, node);
1505 }
1506 WARNING(graph_port, check_graph_port, NULL, &graph_nodes);
1507
1508 static struct node *get_remote_endpoint(struct check *c, struct dt_info *dti,
1509                                         struct node *endpoint)
1510 {
1511         int phandle;
1512         struct node *node;
1513         struct property *prop;
1514
1515         prop = get_property(endpoint, "remote-endpoint");
1516         if (!prop)
1517                 return NULL;
1518
1519         phandle = propval_cell(prop);
1520         /* Give up if this is an overlay with external references */
1521         if (phandle == 0 || phandle == -1)
1522                 return NULL;
1523
1524         node = get_node_by_phandle(dti->dt, phandle);
1525         if (!node)
1526                 FAIL_PROP(c, dti, endpoint, prop, "graph phandle is not valid");
1527
1528         return node;
1529 }
1530
1531 static void check_graph_endpoint(struct check *c, struct dt_info *dti,
1532                                  struct node *node)
1533 {
1534         struct node *remote_node;
1535
1536         if (!node->parent || node->parent->bus != &graph_port_bus)
1537                 return;
1538
1539         if (!strprefixeq(node->name, node->basenamelen, "endpoint"))
1540                 FAIL(c, dti, node, "graph endpont node name should be 'endpoint'");
1541
1542         check_graph_reg(c, dti, node);
1543
1544         remote_node = get_remote_endpoint(c, dti, node);
1545         if (!remote_node)
1546                 return;
1547
1548         if (get_remote_endpoint(c, dti, remote_node) != node)
1549                 FAIL(c, dti, node, "graph connection to node '%s' is not bidirectional",
1550                      remote_node->fullpath);
1551 }
1552 WARNING(graph_endpoint, check_graph_endpoint, NULL, &graph_nodes);
1553
1554 static struct check *check_table[] = {
1555         &duplicate_node_names, &duplicate_property_names,
1556         &node_name_chars, &node_name_format, &property_name_chars,
1557         &name_is_string, &name_properties,
1558
1559         &duplicate_label,
1560
1561         &explicit_phandles,
1562         &phandle_references, &path_references,
1563         &omit_unused_nodes,
1564
1565         &address_cells_is_cell, &size_cells_is_cell, &interrupt_cells_is_cell,
1566         &device_type_is_string, &model_is_string, &status_is_string,
1567         &label_is_string,
1568
1569         &compatible_is_string_list, &names_is_string_list,
1570
1571         &property_name_chars_strict,
1572         &node_name_chars_strict,
1573
1574         &addr_size_cells, &reg_format, &ranges_format,
1575
1576         &unit_address_vs_reg,
1577         &unit_address_format,
1578
1579         &pci_bridge,
1580         &pci_device_reg,
1581         &pci_device_bus_num,
1582
1583         &simple_bus_bridge,
1584         &simple_bus_reg,
1585
1586         &avoid_default_addr_size,
1587         &avoid_unnecessary_addr_size,
1588         &unique_unit_address,
1589         &obsolete_chosen_interrupt_controller,
1590         &chosen_node_is_root, &chosen_node_bootargs, &chosen_node_stdout_path,
1591
1592         &clocks_property,
1593         &cooling_device_property,
1594         &dmas_property,
1595         &hwlocks_property,
1596         &interrupts_extended_property,
1597         &io_channels_property,
1598         &iommus_property,
1599         &mboxes_property,
1600         &msi_parent_property,
1601         &mux_controls_property,
1602         &phys_property,
1603         &power_domains_property,
1604         &pwms_property,
1605         &resets_property,
1606         &sound_dai_property,
1607         &thermal_sensors_property,
1608
1609         &deprecated_gpio_property,
1610         &gpios_property,
1611         &interrupts_property,
1612
1613         &alias_paths,
1614
1615         &graph_nodes, &graph_child_address, &graph_port, &graph_endpoint,
1616
1617         &always_fail,
1618 };
1619
1620 static void enable_warning_error(struct check *c, bool warn, bool error)
1621 {
1622         int i;
1623
1624         /* Raising level, also raise it for prereqs */
1625         if ((warn && !c->warn) || (error && !c->error))
1626                 for (i = 0; i < c->num_prereqs; i++)
1627                         enable_warning_error(c->prereq[i], warn, error);
1628
1629         c->warn = c->warn || warn;
1630         c->error = c->error || error;
1631 }
1632
1633 static void disable_warning_error(struct check *c, bool warn, bool error)
1634 {
1635         int i;
1636
1637         /* Lowering level, also lower it for things this is the prereq
1638          * for */
1639         if ((warn && c->warn) || (error && c->error)) {
1640                 for (i = 0; i < ARRAY_SIZE(check_table); i++) {
1641                         struct check *cc = check_table[i];
1642                         int j;
1643
1644                         for (j = 0; j < cc->num_prereqs; j++)
1645                                 if (cc->prereq[j] == c)
1646                                         disable_warning_error(cc, warn, error);
1647                 }
1648         }
1649
1650         c->warn = c->warn && !warn;
1651         c->error = c->error && !error;
1652 }
1653
1654 void parse_checks_option(bool warn, bool error, const char *arg)
1655 {
1656         int i;
1657         const char *name = arg;
1658         bool enable = true;
1659
1660         if ((strncmp(arg, "no-", 3) == 0)
1661             || (strncmp(arg, "no_", 3) == 0)) {
1662                 name = arg + 3;
1663                 enable = false;
1664         }
1665
1666         for (i = 0; i < ARRAY_SIZE(check_table); i++) {
1667                 struct check *c = check_table[i];
1668
1669                 if (streq(c->name, name)) {
1670                         if (enable)
1671                                 enable_warning_error(c, warn, error);
1672                         else
1673                                 disable_warning_error(c, warn, error);
1674                         return;
1675                 }
1676         }
1677
1678         die("Unrecognized check name \"%s\"\n", name);
1679 }
1680
1681 void process_checks(bool force, struct dt_info *dti)
1682 {
1683         int i;
1684         int error = 0;
1685
1686         for (i = 0; i < ARRAY_SIZE(check_table); i++) {
1687                 struct check *c = check_table[i];
1688
1689                 if (c->warn || c->error)
1690                         error = error || run_check(c, dti);
1691         }
1692
1693         if (error) {
1694                 if (!force) {
1695                         fprintf(stderr, "ERROR: Input tree has errors, aborting "
1696                                 "(use -f to force output)\n");
1697                         exit(2);
1698                 } else if (quiet < 3) {
1699                         fprintf(stderr, "Warning: Input tree has errors, "
1700                                 "output forced\n");
1701                 }
1702         }
1703 }