1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 #ifndef _LINUX_OF_H 3 #define _LINUX_OF_H 4 /* 5 * Definitions for talking to the Open Firmware PROM on 6 * Power Macintosh and other computers. 7 * 8 * Copyright (C) 1996-2005 Paul Mackerras. 9 * 10 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp. 11 * Updates for SPARC64 by David S. Miller 12 * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp. 13 */ 14 #include <linux/types.h> 15 #include <linux/bitops.h> 16 #include <linux/errno.h> 17 #include <linux/kobject.h> 18 #include <linux/mod_devicetable.h> 19 #include <linux/spinlock.h> 20 #include <linux/topology.h> 21 #include <linux/notifier.h> 22 #include <linux/property.h> 23 #include <linux/list.h> 24 25 #include <asm/byteorder.h> 26 #include <asm/errno.h> 27 28 typedef u32 phandle; 29 typedef u32 ihandle; 30 31 struct property { 32 char *name; 33 int length; 34 void *value; 35 struct property *next; 36 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC) 37 unsigned long _flags; 38 #endif 39 #if defined(CONFIG_OF_PROMTREE) 40 unsigned int unique_id; 41 #endif 42 #if defined(CONFIG_OF_KOBJ) 43 struct bin_attribute attr; 44 #endif 45 }; 46 47 #if defined(CONFIG_SPARC) 48 struct of_irq_controller; 49 #endif 50 51 struct device_node { 52 const char *name; 53 phandle phandle; 54 const char *full_name; 55 struct fwnode_handle fwnode; 56 57 struct property *properties; 58 struct property *deadprops; /* removed properties */ 59 struct device_node *parent; 60 struct device_node *child; 61 struct device_node *sibling; 62 #if defined(CONFIG_OF_KOBJ) 63 struct kobject kobj; 64 #endif 65 unsigned long _flags; 66 void *data; 67 #if defined(CONFIG_SPARC) 68 unsigned int unique_id; 69 struct of_irq_controller *irq_trans; 70 #endif 71 }; 72 73 #define MAX_PHANDLE_ARGS 16 74 struct of_phandle_args { 75 struct device_node *np; 76 int args_count; 77 uint32_t args[MAX_PHANDLE_ARGS]; 78 }; 79 80 struct of_phandle_iterator { 81 /* Common iterator information */ 82 const char *cells_name; 83 int cell_count; 84 const struct device_node *parent; 85 86 /* List size information */ 87 const __be32 *list_end; 88 const __be32 *phandle_end; 89 90 /* Current position state */ 91 const __be32 *cur; 92 uint32_t cur_count; 93 phandle phandle; 94 struct device_node *node; 95 }; 96 97 struct of_reconfig_data { 98 struct device_node *dn; 99 struct property *prop; 100 struct property *old_prop; 101 }; 102 103 /* initialize a node */ 104 extern struct kobj_type of_node_ktype; 105 extern const struct fwnode_operations of_fwnode_ops; 106 static inline void of_node_init(struct device_node *node) 107 { 108 #if defined(CONFIG_OF_KOBJ) 109 kobject_init(&node->kobj, &of_node_ktype); 110 #endif 111 node->fwnode.ops = &of_fwnode_ops; 112 } 113 114 #if defined(CONFIG_OF_KOBJ) 115 #define of_node_kobj(n) (&(n)->kobj) 116 #else 117 #define of_node_kobj(n) NULL 118 #endif 119 120 #ifdef CONFIG_OF_DYNAMIC 121 extern struct device_node *of_node_get(struct device_node *node); 122 extern void of_node_put(struct device_node *node); 123 #else /* CONFIG_OF_DYNAMIC */ 124 /* Dummy ref counting routines - to be implemented later */ 125 static inline struct device_node *of_node_get(struct device_node *node) 126 { 127 return node; 128 } 129 static inline void of_node_put(struct device_node *node) { } 130 #endif /* !CONFIG_OF_DYNAMIC */ 131 132 /* Pointer for first entry in chain of all nodes. */ 133 extern struct device_node *of_root; 134 extern struct device_node *of_chosen; 135 extern struct device_node *of_aliases; 136 extern struct device_node *of_stdout; 137 extern raw_spinlock_t devtree_lock; 138 139 /* 140 * struct device_node flag descriptions 141 * (need to be visible even when !CONFIG_OF) 142 */ 143 #define OF_DYNAMIC 1 /* (and properties) allocated via kmalloc */ 144 #define OF_DETACHED 2 /* detached from the device tree */ 145 #define OF_POPULATED 3 /* device already created */ 146 #define OF_POPULATED_BUS 4 /* platform bus created for children */ 147 #define OF_OVERLAY 5 /* allocated for an overlay */ 148 #define OF_OVERLAY_FREE_CSET 6 /* in overlay cset being freed */ 149 150 #define OF_BAD_ADDR ((u64)-1) 151 152 #ifdef CONFIG_OF 153 void of_core_init(void); 154 155 static inline bool is_of_node(const struct fwnode_handle *fwnode) 156 { 157 return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &of_fwnode_ops; 158 } 159 160 #define to_of_node(__fwnode) \ 161 ({ \ 162 typeof(__fwnode) __to_of_node_fwnode = (__fwnode); \ 163 \ 164 is_of_node(__to_of_node_fwnode) ? \ 165 container_of(__to_of_node_fwnode, \ 166 struct device_node, fwnode) : \ 167 NULL; \ 168 }) 169 170 #define of_fwnode_handle(node) \ 171 ({ \ 172 typeof(node) __of_fwnode_handle_node = (node); \ 173 \ 174 __of_fwnode_handle_node ? \ 175 &__of_fwnode_handle_node->fwnode : NULL; \ 176 }) 177 178 static inline bool of_have_populated_dt(void) 179 { 180 return of_root != NULL; 181 } 182 183 static inline bool of_node_is_root(const struct device_node *node) 184 { 185 return node && (node->parent == NULL); 186 } 187 188 static inline int of_node_check_flag(struct device_node *n, unsigned long flag) 189 { 190 return test_bit(flag, &n->_flags); 191 } 192 193 static inline int of_node_test_and_set_flag(struct device_node *n, 194 unsigned long flag) 195 { 196 return test_and_set_bit(flag, &n->_flags); 197 } 198 199 static inline void of_node_set_flag(struct device_node *n, unsigned long flag) 200 { 201 set_bit(flag, &n->_flags); 202 } 203 204 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag) 205 { 206 clear_bit(flag, &n->_flags); 207 } 208 209 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC) 210 static inline int of_property_check_flag(struct property *p, unsigned long flag) 211 { 212 return test_bit(flag, &p->_flags); 213 } 214 215 static inline void of_property_set_flag(struct property *p, unsigned long flag) 216 { 217 set_bit(flag, &p->_flags); 218 } 219 220 static inline void of_property_clear_flag(struct property *p, unsigned long flag) 221 { 222 clear_bit(flag, &p->_flags); 223 } 224 #endif 225 226 extern struct device_node *__of_find_all_nodes(struct device_node *prev); 227 extern struct device_node *of_find_all_nodes(struct device_node *prev); 228 229 /* 230 * OF address retrieval & translation 231 */ 232 233 /* Helper to read a big number; size is in cells (not bytes) */ 234 static inline u64 of_read_number(const __be32 *cell, int size) 235 { 236 u64 r = 0; 237 for (; size--; cell++) 238 r = (r << 32) | be32_to_cpu(*cell); 239 return r; 240 } 241 242 /* Like of_read_number, but we want an unsigned long result */ 243 static inline unsigned long of_read_ulong(const __be32 *cell, int size) 244 { 245 /* toss away upper bits if unsigned long is smaller than u64 */ 246 return of_read_number(cell, size); 247 } 248 249 #if defined(CONFIG_SPARC) 250 #include <asm/prom.h> 251 #endif 252 253 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags) 254 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags) 255 256 extern bool of_node_name_eq(const struct device_node *np, const char *name); 257 extern bool of_node_name_prefix(const struct device_node *np, const char *prefix); 258 259 static inline const char *of_node_full_name(const struct device_node *np) 260 { 261 return np ? np->full_name : "<no-node>"; 262 } 263 264 #define for_each_of_allnodes_from(from, dn) \ 265 for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn)) 266 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn) 267 extern struct device_node *of_find_node_by_name(struct device_node *from, 268 const char *name); 269 extern struct device_node *of_find_node_by_type(struct device_node *from, 270 const char *type); 271 extern struct device_node *of_find_compatible_node(struct device_node *from, 272 const char *type, const char *compat); 273 extern struct device_node *of_find_matching_node_and_match( 274 struct device_node *from, 275 const struct of_device_id *matches, 276 const struct of_device_id **match); 277 278 extern struct device_node *of_find_node_opts_by_path(const char *path, 279 const char **opts); 280 static inline struct device_node *of_find_node_by_path(const char *path) 281 { 282 return of_find_node_opts_by_path(path, NULL); 283 } 284 285 extern struct device_node *of_find_node_by_phandle(phandle handle); 286 extern struct device_node *of_get_parent(const struct device_node *node); 287 extern struct device_node *of_get_next_parent(struct device_node *node); 288 extern struct device_node *of_get_next_child(const struct device_node *node, 289 struct device_node *prev); 290 extern struct device_node *of_get_next_available_child( 291 const struct device_node *node, struct device_node *prev); 292 293 extern struct device_node *of_get_compatible_child(const struct device_node *parent, 294 const char *compatible); 295 extern struct device_node *of_get_child_by_name(const struct device_node *node, 296 const char *name); 297 298 /* cache lookup */ 299 extern struct device_node *of_find_next_cache_node(const struct device_node *); 300 extern int of_find_last_cache_level(unsigned int cpu); 301 extern struct device_node *of_find_node_with_property( 302 struct device_node *from, const char *prop_name); 303 304 extern struct property *of_find_property(const struct device_node *np, 305 const char *name, 306 int *lenp); 307 extern int of_property_count_elems_of_size(const struct device_node *np, 308 const char *propname, int elem_size); 309 extern int of_property_read_u32_index(const struct device_node *np, 310 const char *propname, 311 u32 index, u32 *out_value); 312 extern int of_property_read_u64_index(const struct device_node *np, 313 const char *propname, 314 u32 index, u64 *out_value); 315 extern int of_property_read_variable_u8_array(const struct device_node *np, 316 const char *propname, u8 *out_values, 317 size_t sz_min, size_t sz_max); 318 extern int of_property_read_variable_u16_array(const struct device_node *np, 319 const char *propname, u16 *out_values, 320 size_t sz_min, size_t sz_max); 321 extern int of_property_read_variable_u32_array(const struct device_node *np, 322 const char *propname, 323 u32 *out_values, 324 size_t sz_min, 325 size_t sz_max); 326 extern int of_property_read_u64(const struct device_node *np, 327 const char *propname, u64 *out_value); 328 extern int of_property_read_variable_u64_array(const struct device_node *np, 329 const char *propname, 330 u64 *out_values, 331 size_t sz_min, 332 size_t sz_max); 333 334 extern int of_property_read_string(const struct device_node *np, 335 const char *propname, 336 const char **out_string); 337 extern int of_property_match_string(const struct device_node *np, 338 const char *propname, 339 const char *string); 340 extern int of_property_read_string_helper(const struct device_node *np, 341 const char *propname, 342 const char **out_strs, size_t sz, int index); 343 extern int of_device_is_compatible(const struct device_node *device, 344 const char *); 345 extern int of_device_compatible_match(struct device_node *device, 346 const char *const *compat); 347 extern bool of_device_is_available(const struct device_node *device); 348 extern bool of_device_is_big_endian(const struct device_node *device); 349 extern const void *of_get_property(const struct device_node *node, 350 const char *name, 351 int *lenp); 352 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread); 353 extern struct device_node *of_get_next_cpu_node(struct device_node *prev); 354 extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, 355 int index); 356 357 #define for_each_property_of_node(dn, pp) \ 358 for (pp = dn->properties; pp != NULL; pp = pp->next) 359 360 extern int of_n_addr_cells(struct device_node *np); 361 extern int of_n_size_cells(struct device_node *np); 362 extern const struct of_device_id *of_match_node( 363 const struct of_device_id *matches, const struct device_node *node); 364 extern int of_modalias_node(struct device_node *node, char *modalias, int len); 365 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args); 366 extern struct device_node *of_parse_phandle(const struct device_node *np, 367 const char *phandle_name, 368 int index); 369 extern int of_parse_phandle_with_args(const struct device_node *np, 370 const char *list_name, const char *cells_name, int index, 371 struct of_phandle_args *out_args); 372 extern int of_parse_phandle_with_args_map(const struct device_node *np, 373 const char *list_name, const char *stem_name, int index, 374 struct of_phandle_args *out_args); 375 extern int of_parse_phandle_with_fixed_args(const struct device_node *np, 376 const char *list_name, int cells_count, int index, 377 struct of_phandle_args *out_args); 378 extern int of_count_phandle_with_args(const struct device_node *np, 379 const char *list_name, const char *cells_name); 380 381 /* phandle iterator functions */ 382 extern int of_phandle_iterator_init(struct of_phandle_iterator *it, 383 const struct device_node *np, 384 const char *list_name, 385 const char *cells_name, 386 int cell_count); 387 388 extern int of_phandle_iterator_next(struct of_phandle_iterator *it); 389 extern int of_phandle_iterator_args(struct of_phandle_iterator *it, 390 uint32_t *args, 391 int size); 392 393 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align)); 394 extern int of_alias_get_id(struct device_node *np, const char *stem); 395 extern int of_alias_get_highest_id(const char *stem); 396 extern int of_alias_get_alias_list(const struct of_device_id *matches, 397 const char *stem, unsigned long *bitmap, 398 unsigned int nbits); 399 400 extern int of_machine_is_compatible(const char *compat); 401 402 extern int of_add_property(struct device_node *np, struct property *prop); 403 extern int of_remove_property(struct device_node *np, struct property *prop); 404 extern int of_update_property(struct device_node *np, struct property *newprop); 405 406 /* For updating the device tree at runtime */ 407 #define OF_RECONFIG_ATTACH_NODE 0x0001 408 #define OF_RECONFIG_DETACH_NODE 0x0002 409 #define OF_RECONFIG_ADD_PROPERTY 0x0003 410 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004 411 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005 412 413 extern int of_attach_node(struct device_node *); 414 extern int of_detach_node(struct device_node *); 415 416 #define of_match_ptr(_ptr) (_ptr) 417 418 /** 419 * of_property_read_u8_array - Find and read an array of u8 from a property. 420 * 421 * @np: device node from which the property value is to be read. 422 * @propname: name of the property to be searched. 423 * @out_values: pointer to return value, modified only if return value is 0. 424 * @sz: number of array elements to read 425 * 426 * Search for a property in a device node and read 8-bit value(s) from 427 * it. Returns 0 on success, -EINVAL if the property does not exist, 428 * -ENODATA if property does not have a value, and -EOVERFLOW if the 429 * property data isn't large enough. 430 * 431 * dts entry of array should be like: 432 * property = /bits/ 8 <0x50 0x60 0x70>; 433 * 434 * The out_values is modified only if a valid u8 value can be decoded. 435 */ 436 static inline int of_property_read_u8_array(const struct device_node *np, 437 const char *propname, 438 u8 *out_values, size_t sz) 439 { 440 int ret = of_property_read_variable_u8_array(np, propname, out_values, 441 sz, 0); 442 if (ret >= 0) 443 return 0; 444 else 445 return ret; 446 } 447 448 /** 449 * of_property_read_u16_array - Find and read an array of u16 from a property. 450 * 451 * @np: device node from which the property value is to be read. 452 * @propname: name of the property to be searched. 453 * @out_values: pointer to return value, modified only if return value is 0. 454 * @sz: number of array elements to read 455 * 456 * Search for a property in a device node and read 16-bit value(s) from 457 * it. Returns 0 on success, -EINVAL if the property does not exist, 458 * -ENODATA if property does not have a value, and -EOVERFLOW if the 459 * property data isn't large enough. 460 * 461 * dts entry of array should be like: 462 * property = /bits/ 16 <0x5000 0x6000 0x7000>; 463 * 464 * The out_values is modified only if a valid u16 value can be decoded. 465 */ 466 static inline int of_property_read_u16_array(const struct device_node *np, 467 const char *propname, 468 u16 *out_values, size_t sz) 469 { 470 int ret = of_property_read_variable_u16_array(np, propname, out_values, 471 sz, 0); 472 if (ret >= 0) 473 return 0; 474 else 475 return ret; 476 } 477 478 /** 479 * of_property_read_u32_array - Find and read an array of 32 bit integers 480 * from a property. 481 * 482 * @np: device node from which the property value is to be read. 483 * @propname: name of the property to be searched. 484 * @out_values: pointer to return value, modified only if return value is 0. 485 * @sz: number of array elements to read 486 * 487 * Search for a property in a device node and read 32-bit value(s) from 488 * it. Returns 0 on success, -EINVAL if the property does not exist, 489 * -ENODATA if property does not have a value, and -EOVERFLOW if the 490 * property data isn't large enough. 491 * 492 * The out_values is modified only if a valid u32 value can be decoded. 493 */ 494 static inline int of_property_read_u32_array(const struct device_node *np, 495 const char *propname, 496 u32 *out_values, size_t sz) 497 { 498 int ret = of_property_read_variable_u32_array(np, propname, out_values, 499 sz, 0); 500 if (ret >= 0) 501 return 0; 502 else 503 return ret; 504 } 505 506 /** 507 * of_property_read_u64_array - Find and read an array of 64 bit integers 508 * from a property. 509 * 510 * @np: device node from which the property value is to be read. 511 * @propname: name of the property to be searched. 512 * @out_values: pointer to return value, modified only if return value is 0. 513 * @sz: number of array elements to read 514 * 515 * Search for a property in a device node and read 64-bit value(s) from 516 * it. Returns 0 on success, -EINVAL if the property does not exist, 517 * -ENODATA if property does not have a value, and -EOVERFLOW if the 518 * property data isn't large enough. 519 * 520 * The out_values is modified only if a valid u64 value can be decoded. 521 */ 522 static inline int of_property_read_u64_array(const struct device_node *np, 523 const char *propname, 524 u64 *out_values, size_t sz) 525 { 526 int ret = of_property_read_variable_u64_array(np, propname, out_values, 527 sz, 0); 528 if (ret >= 0) 529 return 0; 530 else 531 return ret; 532 } 533 534 /* 535 * struct property *prop; 536 * const __be32 *p; 537 * u32 u; 538 * 539 * of_property_for_each_u32(np, "propname", prop, p, u) 540 * printk("U32 value: %x\n", u); 541 */ 542 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur, 543 u32 *pu); 544 /* 545 * struct property *prop; 546 * const char *s; 547 * 548 * of_property_for_each_string(np, "propname", prop, s) 549 * printk("String value: %s\n", s); 550 */ 551 const char *of_prop_next_string(struct property *prop, const char *cur); 552 553 bool of_console_check(struct device_node *dn, char *name, int index); 554 555 extern int of_cpu_node_to_id(struct device_node *np); 556 557 int of_map_rid(struct device_node *np, u32 rid, 558 const char *map_name, const char *map_mask_name, 559 struct device_node **target, u32 *id_out); 560 561 #else /* CONFIG_OF */ 562 563 static inline void of_core_init(void) 564 { 565 } 566 567 static inline bool is_of_node(const struct fwnode_handle *fwnode) 568 { 569 return false; 570 } 571 572 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode) 573 { 574 return NULL; 575 } 576 577 static inline bool of_node_name_eq(const struct device_node *np, const char *name) 578 { 579 return false; 580 } 581 582 static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix) 583 { 584 return false; 585 } 586 587 static inline const char* of_node_full_name(const struct device_node *np) 588 { 589 return "<no-node>"; 590 } 591 592 static inline struct device_node *of_find_node_by_name(struct device_node *from, 593 const char *name) 594 { 595 return NULL; 596 } 597 598 static inline struct device_node *of_find_node_by_type(struct device_node *from, 599 const char *type) 600 { 601 return NULL; 602 } 603 604 static inline struct device_node *of_find_matching_node_and_match( 605 struct device_node *from, 606 const struct of_device_id *matches, 607 const struct of_device_id **match) 608 { 609 return NULL; 610 } 611 612 static inline struct device_node *of_find_node_by_path(const char *path) 613 { 614 return NULL; 615 } 616 617 static inline struct device_node *of_find_node_opts_by_path(const char *path, 618 const char **opts) 619 { 620 return NULL; 621 } 622 623 static inline struct device_node *of_find_node_by_phandle(phandle handle) 624 { 625 return NULL; 626 } 627 628 static inline struct device_node *of_get_parent(const struct device_node *node) 629 { 630 return NULL; 631 } 632 633 static inline struct device_node *of_get_next_child( 634 const struct device_node *node, struct device_node *prev) 635 { 636 return NULL; 637 } 638 639 static inline struct device_node *of_get_next_available_child( 640 const struct device_node *node, struct device_node *prev) 641 { 642 return NULL; 643 } 644 645 static inline struct device_node *of_find_node_with_property( 646 struct device_node *from, const char *prop_name) 647 { 648 return NULL; 649 } 650 651 #define of_fwnode_handle(node) NULL 652 653 static inline bool of_have_populated_dt(void) 654 { 655 return false; 656 } 657 658 static inline struct device_node *of_get_compatible_child(const struct device_node *parent, 659 const char *compatible) 660 { 661 return NULL; 662 } 663 664 static inline struct device_node *of_get_child_by_name( 665 const struct device_node *node, 666 const char *name) 667 { 668 return NULL; 669 } 670 671 static inline int of_device_is_compatible(const struct device_node *device, 672 const char *name) 673 { 674 return 0; 675 } 676 677 static inline int of_device_compatible_match(struct device_node *device, 678 const char *const *compat) 679 { 680 return 0; 681 } 682 683 static inline bool of_device_is_available(const struct device_node *device) 684 { 685 return false; 686 } 687 688 static inline bool of_device_is_big_endian(const struct device_node *device) 689 { 690 return false; 691 } 692 693 static inline struct property *of_find_property(const struct device_node *np, 694 const char *name, 695 int *lenp) 696 { 697 return NULL; 698 } 699 700 static inline struct device_node *of_find_compatible_node( 701 struct device_node *from, 702 const char *type, 703 const char *compat) 704 { 705 return NULL; 706 } 707 708 static inline int of_property_count_elems_of_size(const struct device_node *np, 709 const char *propname, int elem_size) 710 { 711 return -ENOSYS; 712 } 713 714 static inline int of_property_read_u8_array(const struct device_node *np, 715 const char *propname, u8 *out_values, size_t sz) 716 { 717 return -ENOSYS; 718 } 719 720 static inline int of_property_read_u16_array(const struct device_node *np, 721 const char *propname, u16 *out_values, size_t sz) 722 { 723 return -ENOSYS; 724 } 725 726 static inline int of_property_read_u32_array(const struct device_node *np, 727 const char *propname, 728 u32 *out_values, size_t sz) 729 { 730 return -ENOSYS; 731 } 732 733 static inline int of_property_read_u64_array(const struct device_node *np, 734 const char *propname, 735 u64 *out_values, size_t sz) 736 { 737 return -ENOSYS; 738 } 739 740 static inline int of_property_read_u32_index(const struct device_node *np, 741 const char *propname, u32 index, u32 *out_value) 742 { 743 return -ENOSYS; 744 } 745 746 static inline int of_property_read_u64_index(const struct device_node *np, 747 const char *propname, u32 index, u64 *out_value) 748 { 749 return -ENOSYS; 750 } 751 752 static inline const void *of_get_property(const struct device_node *node, 753 const char *name, 754 int *lenp) 755 { 756 return NULL; 757 } 758 759 static inline struct device_node *of_get_cpu_node(int cpu, 760 unsigned int *thread) 761 { 762 return NULL; 763 } 764 765 static inline struct device_node *of_get_next_cpu_node(struct device_node *prev) 766 { 767 return NULL; 768 } 769 770 static inline struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, 771 int index) 772 { 773 return NULL; 774 } 775 776 static inline int of_n_addr_cells(struct device_node *np) 777 { 778 return 0; 779 780 } 781 static inline int of_n_size_cells(struct device_node *np) 782 { 783 return 0; 784 } 785 786 static inline int of_property_read_variable_u8_array(const struct device_node *np, 787 const char *propname, u8 *out_values, 788 size_t sz_min, size_t sz_max) 789 { 790 return -ENOSYS; 791 } 792 793 static inline int of_property_read_variable_u16_array(const struct device_node *np, 794 const char *propname, u16 *out_values, 795 size_t sz_min, size_t sz_max) 796 { 797 return -ENOSYS; 798 } 799 800 static inline int of_property_read_variable_u32_array(const struct device_node *np, 801 const char *propname, 802 u32 *out_values, 803 size_t sz_min, 804 size_t sz_max) 805 { 806 return -ENOSYS; 807 } 808 809 static inline int of_property_read_u64(const struct device_node *np, 810 const char *propname, u64 *out_value) 811 { 812 return -ENOSYS; 813 } 814 815 static inline int of_property_read_variable_u64_array(const struct device_node *np, 816 const char *propname, 817 u64 *out_values, 818 size_t sz_min, 819 size_t sz_max) 820 { 821 return -ENOSYS; 822 } 823 824 static inline int of_property_read_string(const struct device_node *np, 825 const char *propname, 826 const char **out_string) 827 { 828 return -ENOSYS; 829 } 830 831 static inline int of_property_match_string(const struct device_node *np, 832 const char *propname, 833 const char *string) 834 { 835 return -ENOSYS; 836 } 837 838 static inline int of_property_read_string_helper(const struct device_node *np, 839 const char *propname, 840 const char **out_strs, size_t sz, int index) 841 { 842 return -ENOSYS; 843 } 844 845 static inline struct device_node *of_parse_phandle(const struct device_node *np, 846 const char *phandle_name, 847 int index) 848 { 849 return NULL; 850 } 851 852 static inline int of_parse_phandle_with_args(const struct device_node *np, 853 const char *list_name, 854 const char *cells_name, 855 int index, 856 struct of_phandle_args *out_args) 857 { 858 return -ENOSYS; 859 } 860 861 static inline int of_parse_phandle_with_args_map(const struct device_node *np, 862 const char *list_name, 863 const char *stem_name, 864 int index, 865 struct of_phandle_args *out_args) 866 { 867 return -ENOSYS; 868 } 869 870 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np, 871 const char *list_name, int cells_count, int index, 872 struct of_phandle_args *out_args) 873 { 874 return -ENOSYS; 875 } 876 877 static inline int of_count_phandle_with_args(struct device_node *np, 878 const char *list_name, 879 const char *cells_name) 880 { 881 return -ENOSYS; 882 } 883 884 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it, 885 const struct device_node *np, 886 const char *list_name, 887 const char *cells_name, 888 int cell_count) 889 { 890 return -ENOSYS; 891 } 892 893 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it) 894 { 895 return -ENOSYS; 896 } 897 898 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it, 899 uint32_t *args, 900 int size) 901 { 902 return 0; 903 } 904 905 static inline int of_alias_get_id(struct device_node *np, const char *stem) 906 { 907 return -ENOSYS; 908 } 909 910 static inline int of_alias_get_highest_id(const char *stem) 911 { 912 return -ENOSYS; 913 } 914 915 static inline int of_alias_get_alias_list(const struct of_device_id *matches, 916 const char *stem, unsigned long *bitmap, 917 unsigned int nbits) 918 { 919 return -ENOSYS; 920 } 921 922 static inline int of_machine_is_compatible(const char *compat) 923 { 924 return 0; 925 } 926 927 static inline bool of_console_check(const struct device_node *dn, const char *name, int index) 928 { 929 return false; 930 } 931 932 static inline const __be32 *of_prop_next_u32(struct property *prop, 933 const __be32 *cur, u32 *pu) 934 { 935 return NULL; 936 } 937 938 static inline const char *of_prop_next_string(struct property *prop, 939 const char *cur) 940 { 941 return NULL; 942 } 943 944 static inline int of_node_check_flag(struct device_node *n, unsigned long flag) 945 { 946 return 0; 947 } 948 949 static inline int of_node_test_and_set_flag(struct device_node *n, 950 unsigned long flag) 951 { 952 return 0; 953 } 954 955 static inline void of_node_set_flag(struct device_node *n, unsigned long flag) 956 { 957 } 958 959 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag) 960 { 961 } 962 963 static inline int of_property_check_flag(struct property *p, unsigned long flag) 964 { 965 return 0; 966 } 967 968 static inline void of_property_set_flag(struct property *p, unsigned long flag) 969 { 970 } 971 972 static inline void of_property_clear_flag(struct property *p, unsigned long flag) 973 { 974 } 975 976 static inline int of_cpu_node_to_id(struct device_node *np) 977 { 978 return -ENODEV; 979 } 980 981 static inline int of_map_rid(struct device_node *np, u32 rid, 982 const char *map_name, const char *map_mask_name, 983 struct device_node **target, u32 *id_out) 984 { 985 return -EINVAL; 986 } 987 988 #define of_match_ptr(_ptr) NULL 989 #define of_match_node(_matches, _node) NULL 990 #endif /* CONFIG_OF */ 991 992 /* Default string compare functions, Allow arch asm/prom.h to override */ 993 #if !defined(of_compat_cmp) 994 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2)) 995 #define of_prop_cmp(s1, s2) strcmp((s1), (s2)) 996 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2)) 997 #endif 998 999 static inline int of_prop_val_eq(struct property *p1, struct property *p2) 1000 { 1001 return p1->length == p2->length && 1002 !memcmp(p1->value, p2->value, (size_t)p1->length); 1003 } 1004 1005 #if defined(CONFIG_OF) && defined(CONFIG_NUMA) 1006 extern int of_node_to_nid(struct device_node *np); 1007 #else 1008 static inline int of_node_to_nid(struct device_node *device) 1009 { 1010 return NUMA_NO_NODE; 1011 } 1012 #endif 1013 1014 #ifdef CONFIG_OF_NUMA 1015 extern int of_numa_init(void); 1016 #else 1017 static inline int of_numa_init(void) 1018 { 1019 return -ENOSYS; 1020 } 1021 #endif 1022 1023 static inline struct device_node *of_find_matching_node( 1024 struct device_node *from, 1025 const struct of_device_id *matches) 1026 { 1027 return of_find_matching_node_and_match(from, matches, NULL); 1028 } 1029 1030 static inline const char *of_node_get_device_type(const struct device_node *np) 1031 { 1032 return of_get_property(np, "device_type", NULL); 1033 } 1034 1035 static inline bool of_node_is_type(const struct device_node *np, const char *type) 1036 { 1037 const char *match = of_node_get_device_type(np); 1038 1039 return np && match && type && !strcmp(match, type); 1040 } 1041 1042 /** 1043 * of_property_count_u8_elems - Count the number of u8 elements in a property 1044 * 1045 * @np: device node from which the property value is to be read. 1046 * @propname: name of the property to be searched. 1047 * 1048 * Search for a property in a device node and count the number of u8 elements 1049 * in it. Returns number of elements on sucess, -EINVAL if the property does 1050 * not exist or its length does not match a multiple of u8 and -ENODATA if the 1051 * property does not have a value. 1052 */ 1053 static inline int of_property_count_u8_elems(const struct device_node *np, 1054 const char *propname) 1055 { 1056 return of_property_count_elems_of_size(np, propname, sizeof(u8)); 1057 } 1058 1059 /** 1060 * of_property_count_u16_elems - Count the number of u16 elements in a property 1061 * 1062 * @np: device node from which the property value is to be read. 1063 * @propname: name of the property to be searched. 1064 * 1065 * Search for a property in a device node and count the number of u16 elements 1066 * in it. Returns number of elements on sucess, -EINVAL if the property does 1067 * not exist or its length does not match a multiple of u16 and -ENODATA if the 1068 * property does not have a value. 1069 */ 1070 static inline int of_property_count_u16_elems(const struct device_node *np, 1071 const char *propname) 1072 { 1073 return of_property_count_elems_of_size(np, propname, sizeof(u16)); 1074 } 1075 1076 /** 1077 * of_property_count_u32_elems - Count the number of u32 elements in a property 1078 * 1079 * @np: device node from which the property value is to be read. 1080 * @propname: name of the property to be searched. 1081 * 1082 * Search for a property in a device node and count the number of u32 elements 1083 * in it. Returns number of elements on sucess, -EINVAL if the property does 1084 * not exist or its length does not match a multiple of u32 and -ENODATA if the 1085 * property does not have a value. 1086 */ 1087 static inline int of_property_count_u32_elems(const struct device_node *np, 1088 const char *propname) 1089 { 1090 return of_property_count_elems_of_size(np, propname, sizeof(u32)); 1091 } 1092 1093 /** 1094 * of_property_count_u64_elems - Count the number of u64 elements in a property 1095 * 1096 * @np: device node from which the property value is to be read. 1097 * @propname: name of the property to be searched. 1098 * 1099 * Search for a property in a device node and count the number of u64 elements 1100 * in it. Returns number of elements on sucess, -EINVAL if the property does 1101 * not exist or its length does not match a multiple of u64 and -ENODATA if the 1102 * property does not have a value. 1103 */ 1104 static inline int of_property_count_u64_elems(const struct device_node *np, 1105 const char *propname) 1106 { 1107 return of_property_count_elems_of_size(np, propname, sizeof(u64)); 1108 } 1109 1110 /** 1111 * of_property_read_string_array() - Read an array of strings from a multiple 1112 * strings property. 1113 * @np: device node from which the property value is to be read. 1114 * @propname: name of the property to be searched. 1115 * @out_strs: output array of string pointers. 1116 * @sz: number of array elements to read. 1117 * 1118 * Search for a property in a device tree node and retrieve a list of 1119 * terminated string values (pointer to data, not a copy) in that property. 1120 * 1121 * If @out_strs is NULL, the number of strings in the property is returned. 1122 */ 1123 static inline int of_property_read_string_array(const struct device_node *np, 1124 const char *propname, const char **out_strs, 1125 size_t sz) 1126 { 1127 return of_property_read_string_helper(np, propname, out_strs, sz, 0); 1128 } 1129 1130 /** 1131 * of_property_count_strings() - Find and return the number of strings from a 1132 * multiple strings property. 1133 * @np: device node from which the property value is to be read. 1134 * @propname: name of the property to be searched. 1135 * 1136 * Search for a property in a device tree node and retrieve the number of null 1137 * terminated string contain in it. Returns the number of strings on 1138 * success, -EINVAL if the property does not exist, -ENODATA if property 1139 * does not have a value, and -EILSEQ if the string is not null-terminated 1140 * within the length of the property data. 1141 */ 1142 static inline int of_property_count_strings(const struct device_node *np, 1143 const char *propname) 1144 { 1145 return of_property_read_string_helper(np, propname, NULL, 0, 0); 1146 } 1147 1148 /** 1149 * of_property_read_string_index() - Find and read a string from a multiple 1150 * strings property. 1151 * @np: device node from which the property value is to be read. 1152 * @propname: name of the property to be searched. 1153 * @index: index of the string in the list of strings 1154 * @out_string: pointer to null terminated return string, modified only if 1155 * return value is 0. 1156 * 1157 * Search for a property in a device tree node and retrieve a null 1158 * terminated string value (pointer to data, not a copy) in the list of strings 1159 * contained in that property. 1160 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if 1161 * property does not have a value, and -EILSEQ if the string is not 1162 * null-terminated within the length of the property data. 1163 * 1164 * The out_string pointer is modified only if a valid string can be decoded. 1165 */ 1166 static inline int of_property_read_string_index(const struct device_node *np, 1167 const char *propname, 1168 int index, const char **output) 1169 { 1170 int rc = of_property_read_string_helper(np, propname, output, 1, index); 1171 return rc < 0 ? rc : 0; 1172 } 1173 1174 /** 1175 * of_property_read_bool - Find a property 1176 * @np: device node from which the property value is to be read. 1177 * @propname: name of the property to be searched. 1178 * 1179 * Search for a property in a device node. 1180 * Returns true if the property exists false otherwise. 1181 */ 1182 static inline bool of_property_read_bool(const struct device_node *np, 1183 const char *propname) 1184 { 1185 struct property *prop = of_find_property(np, propname, NULL); 1186 1187 return prop ? true : false; 1188 } 1189 1190 static inline int of_property_read_u8(const struct device_node *np, 1191 const char *propname, 1192 u8 *out_value) 1193 { 1194 return of_property_read_u8_array(np, propname, out_value, 1); 1195 } 1196 1197 static inline int of_property_read_u16(const struct device_node *np, 1198 const char *propname, 1199 u16 *out_value) 1200 { 1201 return of_property_read_u16_array(np, propname, out_value, 1); 1202 } 1203 1204 static inline int of_property_read_u32(const struct device_node *np, 1205 const char *propname, 1206 u32 *out_value) 1207 { 1208 return of_property_read_u32_array(np, propname, out_value, 1); 1209 } 1210 1211 static inline int of_property_read_s32(const struct device_node *np, 1212 const char *propname, 1213 s32 *out_value) 1214 { 1215 return of_property_read_u32(np, propname, (u32*) out_value); 1216 } 1217 1218 #define of_for_each_phandle(it, err, np, ln, cn, cc) \ 1219 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \ 1220 err = of_phandle_iterator_next(it); \ 1221 err == 0; \ 1222 err = of_phandle_iterator_next(it)) 1223 1224 #define of_property_for_each_u32(np, propname, prop, p, u) \ 1225 for (prop = of_find_property(np, propname, NULL), \ 1226 p = of_prop_next_u32(prop, NULL, &u); \ 1227 p; \ 1228 p = of_prop_next_u32(prop, p, &u)) 1229 1230 #define of_property_for_each_string(np, propname, prop, s) \ 1231 for (prop = of_find_property(np, propname, NULL), \ 1232 s = of_prop_next_string(prop, NULL); \ 1233 s; \ 1234 s = of_prop_next_string(prop, s)) 1235 1236 #define for_each_node_by_name(dn, name) \ 1237 for (dn = of_find_node_by_name(NULL, name); dn; \ 1238 dn = of_find_node_by_name(dn, name)) 1239 #define for_each_node_by_type(dn, type) \ 1240 for (dn = of_find_node_by_type(NULL, type); dn; \ 1241 dn = of_find_node_by_type(dn, type)) 1242 #define for_each_compatible_node(dn, type, compatible) \ 1243 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \ 1244 dn = of_find_compatible_node(dn, type, compatible)) 1245 #define for_each_matching_node(dn, matches) \ 1246 for (dn = of_find_matching_node(NULL, matches); dn; \ 1247 dn = of_find_matching_node(dn, matches)) 1248 #define for_each_matching_node_and_match(dn, matches, match) \ 1249 for (dn = of_find_matching_node_and_match(NULL, matches, match); \ 1250 dn; dn = of_find_matching_node_and_match(dn, matches, match)) 1251 1252 #define for_each_child_of_node(parent, child) \ 1253 for (child = of_get_next_child(parent, NULL); child != NULL; \ 1254 child = of_get_next_child(parent, child)) 1255 #define for_each_available_child_of_node(parent, child) \ 1256 for (child = of_get_next_available_child(parent, NULL); child != NULL; \ 1257 child = of_get_next_available_child(parent, child)) 1258 1259 #define for_each_of_cpu_node(cpu) \ 1260 for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \ 1261 cpu = of_get_next_cpu_node(cpu)) 1262 1263 #define for_each_node_with_property(dn, prop_name) \ 1264 for (dn = of_find_node_with_property(NULL, prop_name); dn; \ 1265 dn = of_find_node_with_property(dn, prop_name)) 1266 1267 static inline int of_get_child_count(const struct device_node *np) 1268 { 1269 struct device_node *child; 1270 int num = 0; 1271 1272 for_each_child_of_node(np, child) 1273 num++; 1274 1275 return num; 1276 } 1277 1278 static inline int of_get_available_child_count(const struct device_node *np) 1279 { 1280 struct device_node *child; 1281 int num = 0; 1282 1283 for_each_available_child_of_node(np, child) 1284 num++; 1285 1286 return num; 1287 } 1288 1289 #if defined(CONFIG_OF) && !defined(MODULE) 1290 #define _OF_DECLARE(table, name, compat, fn, fn_type) \ 1291 static const struct of_device_id __of_table_##name \ 1292 __used __section(__##table##_of_table) \ 1293 = { .compatible = compat, \ 1294 .data = (fn == (fn_type)NULL) ? fn : fn } 1295 #else 1296 #define _OF_DECLARE(table, name, compat, fn, fn_type) \ 1297 static const struct of_device_id __of_table_##name \ 1298 __attribute__((unused)) \ 1299 = { .compatible = compat, \ 1300 .data = (fn == (fn_type)NULL) ? fn : fn } 1301 #endif 1302 1303 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *); 1304 typedef int (*of_init_fn_1_ret)(struct device_node *); 1305 typedef void (*of_init_fn_1)(struct device_node *); 1306 1307 #define OF_DECLARE_1(table, name, compat, fn) \ 1308 _OF_DECLARE(table, name, compat, fn, of_init_fn_1) 1309 #define OF_DECLARE_1_RET(table, name, compat, fn) \ 1310 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret) 1311 #define OF_DECLARE_2(table, name, compat, fn) \ 1312 _OF_DECLARE(table, name, compat, fn, of_init_fn_2) 1313 1314 /** 1315 * struct of_changeset_entry - Holds a changeset entry 1316 * 1317 * @node: list_head for the log list 1318 * @action: notifier action 1319 * @np: pointer to the device node affected 1320 * @prop: pointer to the property affected 1321 * @old_prop: hold a pointer to the original property 1322 * 1323 * Every modification of the device tree during a changeset 1324 * is held in a list of of_changeset_entry structures. 1325 * That way we can recover from a partial application, or we can 1326 * revert the changeset 1327 */ 1328 struct of_changeset_entry { 1329 struct list_head node; 1330 unsigned long action; 1331 struct device_node *np; 1332 struct property *prop; 1333 struct property *old_prop; 1334 }; 1335 1336 /** 1337 * struct of_changeset - changeset tracker structure 1338 * 1339 * @entries: list_head for the changeset entries 1340 * 1341 * changesets are a convenient way to apply bulk changes to the 1342 * live tree. In case of an error, changes are rolled-back. 1343 * changesets live on after initial application, and if not 1344 * destroyed after use, they can be reverted in one single call. 1345 */ 1346 struct of_changeset { 1347 struct list_head entries; 1348 }; 1349 1350 enum of_reconfig_change { 1351 OF_RECONFIG_NO_CHANGE = 0, 1352 OF_RECONFIG_CHANGE_ADD, 1353 OF_RECONFIG_CHANGE_REMOVE, 1354 }; 1355 1356 #ifdef CONFIG_OF_DYNAMIC 1357 extern int of_reconfig_notifier_register(struct notifier_block *); 1358 extern int of_reconfig_notifier_unregister(struct notifier_block *); 1359 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd); 1360 extern int of_reconfig_get_state_change(unsigned long action, 1361 struct of_reconfig_data *arg); 1362 1363 extern void of_changeset_init(struct of_changeset *ocs); 1364 extern void of_changeset_destroy(struct of_changeset *ocs); 1365 extern int of_changeset_apply(struct of_changeset *ocs); 1366 extern int of_changeset_revert(struct of_changeset *ocs); 1367 extern int of_changeset_action(struct of_changeset *ocs, 1368 unsigned long action, struct device_node *np, 1369 struct property *prop); 1370 1371 static inline int of_changeset_attach_node(struct of_changeset *ocs, 1372 struct device_node *np) 1373 { 1374 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL); 1375 } 1376 1377 static inline int of_changeset_detach_node(struct of_changeset *ocs, 1378 struct device_node *np) 1379 { 1380 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL); 1381 } 1382 1383 static inline int of_changeset_add_property(struct of_changeset *ocs, 1384 struct device_node *np, struct property *prop) 1385 { 1386 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop); 1387 } 1388 1389 static inline int of_changeset_remove_property(struct of_changeset *ocs, 1390 struct device_node *np, struct property *prop) 1391 { 1392 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop); 1393 } 1394 1395 static inline int of_changeset_update_property(struct of_changeset *ocs, 1396 struct device_node *np, struct property *prop) 1397 { 1398 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop); 1399 } 1400 #else /* CONFIG_OF_DYNAMIC */ 1401 static inline int of_reconfig_notifier_register(struct notifier_block *nb) 1402 { 1403 return -EINVAL; 1404 } 1405 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb) 1406 { 1407 return -EINVAL; 1408 } 1409 static inline int of_reconfig_notify(unsigned long action, 1410 struct of_reconfig_data *arg) 1411 { 1412 return -EINVAL; 1413 } 1414 static inline int of_reconfig_get_state_change(unsigned long action, 1415 struct of_reconfig_data *arg) 1416 { 1417 return -EINVAL; 1418 } 1419 #endif /* CONFIG_OF_DYNAMIC */ 1420 1421 /** 1422 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node 1423 * @np: Pointer to the given device_node 1424 * 1425 * return true if present false otherwise 1426 */ 1427 static inline bool of_device_is_system_power_controller(const struct device_node *np) 1428 { 1429 return of_property_read_bool(np, "system-power-controller"); 1430 } 1431 1432 /** 1433 * Overlay support 1434 */ 1435 1436 enum of_overlay_notify_action { 1437 OF_OVERLAY_PRE_APPLY = 0, 1438 OF_OVERLAY_POST_APPLY, 1439 OF_OVERLAY_PRE_REMOVE, 1440 OF_OVERLAY_POST_REMOVE, 1441 }; 1442 1443 struct of_overlay_notify_data { 1444 struct device_node *overlay; 1445 struct device_node *target; 1446 }; 1447 1448 #ifdef CONFIG_OF_OVERLAY 1449 1450 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size, 1451 int *ovcs_id); 1452 int of_overlay_remove(int *ovcs_id); 1453 int of_overlay_remove_all(void); 1454 1455 int of_overlay_notifier_register(struct notifier_block *nb); 1456 int of_overlay_notifier_unregister(struct notifier_block *nb); 1457 1458 #else 1459 1460 static inline int of_overlay_fdt_apply(void *overlay_fdt, u32 overlay_fdt_size, 1461 int *ovcs_id) 1462 { 1463 return -ENOTSUPP; 1464 } 1465 1466 static inline int of_overlay_remove(int *ovcs_id) 1467 { 1468 return -ENOTSUPP; 1469 } 1470 1471 static inline int of_overlay_remove_all(void) 1472 { 1473 return -ENOTSUPP; 1474 } 1475 1476 static inline int of_overlay_notifier_register(struct notifier_block *nb) 1477 { 1478 return 0; 1479 } 1480 1481 static inline int of_overlay_notifier_unregister(struct notifier_block *nb) 1482 { 1483 return 0; 1484 } 1485 1486 #endif 1487 1488 #endif /* _LINUX_OF_H */ 1489