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_id(struct device_node *np, u32 id, 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_parent(struct device_node *node) 634 { 635 return NULL; 636 } 637 638 static inline struct device_node *of_get_next_child( 639 const struct device_node *node, struct device_node *prev) 640 { 641 return NULL; 642 } 643 644 static inline struct device_node *of_get_next_available_child( 645 const struct device_node *node, struct device_node *prev) 646 { 647 return NULL; 648 } 649 650 static inline struct device_node *of_find_node_with_property( 651 struct device_node *from, const char *prop_name) 652 { 653 return NULL; 654 } 655 656 #define of_fwnode_handle(node) NULL 657 658 static inline bool of_have_populated_dt(void) 659 { 660 return false; 661 } 662 663 static inline struct device_node *of_get_compatible_child(const struct device_node *parent, 664 const char *compatible) 665 { 666 return NULL; 667 } 668 669 static inline struct device_node *of_get_child_by_name( 670 const struct device_node *node, 671 const char *name) 672 { 673 return NULL; 674 } 675 676 static inline int of_device_is_compatible(const struct device_node *device, 677 const char *name) 678 { 679 return 0; 680 } 681 682 static inline int of_device_compatible_match(struct device_node *device, 683 const char *const *compat) 684 { 685 return 0; 686 } 687 688 static inline bool of_device_is_available(const struct device_node *device) 689 { 690 return false; 691 } 692 693 static inline bool of_device_is_big_endian(const struct device_node *device) 694 { 695 return false; 696 } 697 698 static inline struct property *of_find_property(const struct device_node *np, 699 const char *name, 700 int *lenp) 701 { 702 return NULL; 703 } 704 705 static inline struct device_node *of_find_compatible_node( 706 struct device_node *from, 707 const char *type, 708 const char *compat) 709 { 710 return NULL; 711 } 712 713 static inline int of_property_count_elems_of_size(const struct device_node *np, 714 const char *propname, int elem_size) 715 { 716 return -ENOSYS; 717 } 718 719 static inline int of_property_read_u8_array(const struct device_node *np, 720 const char *propname, u8 *out_values, size_t sz) 721 { 722 return -ENOSYS; 723 } 724 725 static inline int of_property_read_u16_array(const struct device_node *np, 726 const char *propname, u16 *out_values, size_t sz) 727 { 728 return -ENOSYS; 729 } 730 731 static inline int of_property_read_u32_array(const struct device_node *np, 732 const char *propname, 733 u32 *out_values, size_t sz) 734 { 735 return -ENOSYS; 736 } 737 738 static inline int of_property_read_u64_array(const struct device_node *np, 739 const char *propname, 740 u64 *out_values, size_t sz) 741 { 742 return -ENOSYS; 743 } 744 745 static inline int of_property_read_u32_index(const struct device_node *np, 746 const char *propname, u32 index, u32 *out_value) 747 { 748 return -ENOSYS; 749 } 750 751 static inline int of_property_read_u64_index(const struct device_node *np, 752 const char *propname, u32 index, u64 *out_value) 753 { 754 return -ENOSYS; 755 } 756 757 static inline const void *of_get_property(const struct device_node *node, 758 const char *name, 759 int *lenp) 760 { 761 return NULL; 762 } 763 764 static inline struct device_node *of_get_cpu_node(int cpu, 765 unsigned int *thread) 766 { 767 return NULL; 768 } 769 770 static inline struct device_node *of_get_next_cpu_node(struct device_node *prev) 771 { 772 return NULL; 773 } 774 775 static inline struct device_node *of_get_cpu_state_node(struct device_node *cpu_node, 776 int index) 777 { 778 return NULL; 779 } 780 781 static inline int of_n_addr_cells(struct device_node *np) 782 { 783 return 0; 784 785 } 786 static inline int of_n_size_cells(struct device_node *np) 787 { 788 return 0; 789 } 790 791 static inline int of_property_read_variable_u8_array(const struct device_node *np, 792 const char *propname, u8 *out_values, 793 size_t sz_min, size_t sz_max) 794 { 795 return -ENOSYS; 796 } 797 798 static inline int of_property_read_variable_u16_array(const struct device_node *np, 799 const char *propname, u16 *out_values, 800 size_t sz_min, size_t sz_max) 801 { 802 return -ENOSYS; 803 } 804 805 static inline int of_property_read_variable_u32_array(const struct device_node *np, 806 const char *propname, 807 u32 *out_values, 808 size_t sz_min, 809 size_t sz_max) 810 { 811 return -ENOSYS; 812 } 813 814 static inline int of_property_read_u64(const struct device_node *np, 815 const char *propname, u64 *out_value) 816 { 817 return -ENOSYS; 818 } 819 820 static inline int of_property_read_variable_u64_array(const struct device_node *np, 821 const char *propname, 822 u64 *out_values, 823 size_t sz_min, 824 size_t sz_max) 825 { 826 return -ENOSYS; 827 } 828 829 static inline int of_property_read_string(const struct device_node *np, 830 const char *propname, 831 const char **out_string) 832 { 833 return -ENOSYS; 834 } 835 836 static inline int of_property_match_string(const struct device_node *np, 837 const char *propname, 838 const char *string) 839 { 840 return -ENOSYS; 841 } 842 843 static inline int of_property_read_string_helper(const struct device_node *np, 844 const char *propname, 845 const char **out_strs, size_t sz, int index) 846 { 847 return -ENOSYS; 848 } 849 850 static inline struct device_node *of_parse_phandle(const struct device_node *np, 851 const char *phandle_name, 852 int index) 853 { 854 return NULL; 855 } 856 857 static inline int of_parse_phandle_with_args(const struct device_node *np, 858 const char *list_name, 859 const char *cells_name, 860 int index, 861 struct of_phandle_args *out_args) 862 { 863 return -ENOSYS; 864 } 865 866 static inline int of_parse_phandle_with_args_map(const struct device_node *np, 867 const char *list_name, 868 const char *stem_name, 869 int index, 870 struct of_phandle_args *out_args) 871 { 872 return -ENOSYS; 873 } 874 875 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np, 876 const char *list_name, int cells_count, int index, 877 struct of_phandle_args *out_args) 878 { 879 return -ENOSYS; 880 } 881 882 static inline int of_count_phandle_with_args(struct device_node *np, 883 const char *list_name, 884 const char *cells_name) 885 { 886 return -ENOSYS; 887 } 888 889 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it, 890 const struct device_node *np, 891 const char *list_name, 892 const char *cells_name, 893 int cell_count) 894 { 895 return -ENOSYS; 896 } 897 898 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it) 899 { 900 return -ENOSYS; 901 } 902 903 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it, 904 uint32_t *args, 905 int size) 906 { 907 return 0; 908 } 909 910 static inline int of_alias_get_id(struct device_node *np, const char *stem) 911 { 912 return -ENOSYS; 913 } 914 915 static inline int of_alias_get_highest_id(const char *stem) 916 { 917 return -ENOSYS; 918 } 919 920 static inline int of_alias_get_alias_list(const struct of_device_id *matches, 921 const char *stem, unsigned long *bitmap, 922 unsigned int nbits) 923 { 924 return -ENOSYS; 925 } 926 927 static inline int of_machine_is_compatible(const char *compat) 928 { 929 return 0; 930 } 931 932 static inline bool of_console_check(const struct device_node *dn, const char *name, int index) 933 { 934 return false; 935 } 936 937 static inline const __be32 *of_prop_next_u32(struct property *prop, 938 const __be32 *cur, u32 *pu) 939 { 940 return NULL; 941 } 942 943 static inline const char *of_prop_next_string(struct property *prop, 944 const char *cur) 945 { 946 return NULL; 947 } 948 949 static inline int of_node_check_flag(struct device_node *n, unsigned long flag) 950 { 951 return 0; 952 } 953 954 static inline int of_node_test_and_set_flag(struct device_node *n, 955 unsigned long flag) 956 { 957 return 0; 958 } 959 960 static inline void of_node_set_flag(struct device_node *n, unsigned long flag) 961 { 962 } 963 964 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag) 965 { 966 } 967 968 static inline int of_property_check_flag(struct property *p, unsigned long flag) 969 { 970 return 0; 971 } 972 973 static inline void of_property_set_flag(struct property *p, unsigned long flag) 974 { 975 } 976 977 static inline void of_property_clear_flag(struct property *p, unsigned long flag) 978 { 979 } 980 981 static inline int of_cpu_node_to_id(struct device_node *np) 982 { 983 return -ENODEV; 984 } 985 986 static inline int of_map_id(struct device_node *np, u32 id, 987 const char *map_name, const char *map_mask_name, 988 struct device_node **target, u32 *id_out) 989 { 990 return -EINVAL; 991 } 992 993 #define of_match_ptr(_ptr) NULL 994 #define of_match_node(_matches, _node) NULL 995 #endif /* CONFIG_OF */ 996 997 /* Default string compare functions, Allow arch asm/prom.h to override */ 998 #if !defined(of_compat_cmp) 999 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2)) 1000 #define of_prop_cmp(s1, s2) strcmp((s1), (s2)) 1001 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2)) 1002 #endif 1003 1004 static inline int of_prop_val_eq(struct property *p1, struct property *p2) 1005 { 1006 return p1->length == p2->length && 1007 !memcmp(p1->value, p2->value, (size_t)p1->length); 1008 } 1009 1010 #if defined(CONFIG_OF) && defined(CONFIG_NUMA) 1011 extern int of_node_to_nid(struct device_node *np); 1012 #else 1013 static inline int of_node_to_nid(struct device_node *device) 1014 { 1015 return NUMA_NO_NODE; 1016 } 1017 #endif 1018 1019 #ifdef CONFIG_OF_NUMA 1020 extern int of_numa_init(void); 1021 #else 1022 static inline int of_numa_init(void) 1023 { 1024 return -ENOSYS; 1025 } 1026 #endif 1027 1028 static inline struct device_node *of_find_matching_node( 1029 struct device_node *from, 1030 const struct of_device_id *matches) 1031 { 1032 return of_find_matching_node_and_match(from, matches, NULL); 1033 } 1034 1035 static inline const char *of_node_get_device_type(const struct device_node *np) 1036 { 1037 return of_get_property(np, "device_type", NULL); 1038 } 1039 1040 static inline bool of_node_is_type(const struct device_node *np, const char *type) 1041 { 1042 const char *match = of_node_get_device_type(np); 1043 1044 return np && match && type && !strcmp(match, type); 1045 } 1046 1047 /** 1048 * of_property_count_u8_elems - Count the number of u8 elements in a property 1049 * 1050 * @np: device node from which the property value is to be read. 1051 * @propname: name of the property to be searched. 1052 * 1053 * Search for a property in a device node and count the number of u8 elements 1054 * in it. Returns number of elements on sucess, -EINVAL if the property does 1055 * not exist or its length does not match a multiple of u8 and -ENODATA if the 1056 * property does not have a value. 1057 */ 1058 static inline int of_property_count_u8_elems(const struct device_node *np, 1059 const char *propname) 1060 { 1061 return of_property_count_elems_of_size(np, propname, sizeof(u8)); 1062 } 1063 1064 /** 1065 * of_property_count_u16_elems - Count the number of u16 elements in a property 1066 * 1067 * @np: device node from which the property value is to be read. 1068 * @propname: name of the property to be searched. 1069 * 1070 * Search for a property in a device node and count the number of u16 elements 1071 * in it. Returns number of elements on sucess, -EINVAL if the property does 1072 * not exist or its length does not match a multiple of u16 and -ENODATA if the 1073 * property does not have a value. 1074 */ 1075 static inline int of_property_count_u16_elems(const struct device_node *np, 1076 const char *propname) 1077 { 1078 return of_property_count_elems_of_size(np, propname, sizeof(u16)); 1079 } 1080 1081 /** 1082 * of_property_count_u32_elems - Count the number of u32 elements in a property 1083 * 1084 * @np: device node from which the property value is to be read. 1085 * @propname: name of the property to be searched. 1086 * 1087 * Search for a property in a device node and count the number of u32 elements 1088 * in it. Returns number of elements on sucess, -EINVAL if the property does 1089 * not exist or its length does not match a multiple of u32 and -ENODATA if the 1090 * property does not have a value. 1091 */ 1092 static inline int of_property_count_u32_elems(const struct device_node *np, 1093 const char *propname) 1094 { 1095 return of_property_count_elems_of_size(np, propname, sizeof(u32)); 1096 } 1097 1098 /** 1099 * of_property_count_u64_elems - Count the number of u64 elements in a property 1100 * 1101 * @np: device node from which the property value is to be read. 1102 * @propname: name of the property to be searched. 1103 * 1104 * Search for a property in a device node and count the number of u64 elements 1105 * in it. Returns number of elements on sucess, -EINVAL if the property does 1106 * not exist or its length does not match a multiple of u64 and -ENODATA if the 1107 * property does not have a value. 1108 */ 1109 static inline int of_property_count_u64_elems(const struct device_node *np, 1110 const char *propname) 1111 { 1112 return of_property_count_elems_of_size(np, propname, sizeof(u64)); 1113 } 1114 1115 /** 1116 * of_property_read_string_array() - Read an array of strings from a multiple 1117 * strings property. 1118 * @np: device node from which the property value is to be read. 1119 * @propname: name of the property to be searched. 1120 * @out_strs: output array of string pointers. 1121 * @sz: number of array elements to read. 1122 * 1123 * Search for a property in a device tree node and retrieve a list of 1124 * terminated string values (pointer to data, not a copy) in that property. 1125 * 1126 * If @out_strs is NULL, the number of strings in the property is returned. 1127 */ 1128 static inline int of_property_read_string_array(const struct device_node *np, 1129 const char *propname, const char **out_strs, 1130 size_t sz) 1131 { 1132 return of_property_read_string_helper(np, propname, out_strs, sz, 0); 1133 } 1134 1135 /** 1136 * of_property_count_strings() - Find and return the number of strings from a 1137 * multiple strings property. 1138 * @np: device node from which the property value is to be read. 1139 * @propname: name of the property to be searched. 1140 * 1141 * Search for a property in a device tree node and retrieve the number of null 1142 * terminated string contain in it. Returns the number of strings on 1143 * success, -EINVAL if the property does not exist, -ENODATA if property 1144 * does not have a value, and -EILSEQ if the string is not null-terminated 1145 * within the length of the property data. 1146 */ 1147 static inline int of_property_count_strings(const struct device_node *np, 1148 const char *propname) 1149 { 1150 return of_property_read_string_helper(np, propname, NULL, 0, 0); 1151 } 1152 1153 /** 1154 * of_property_read_string_index() - Find and read a string from a multiple 1155 * strings property. 1156 * @np: device node from which the property value is to be read. 1157 * @propname: name of the property to be searched. 1158 * @index: index of the string in the list of strings 1159 * @out_string: pointer to null terminated return string, modified only if 1160 * return value is 0. 1161 * 1162 * Search for a property in a device tree node and retrieve a null 1163 * terminated string value (pointer to data, not a copy) in the list of strings 1164 * contained in that property. 1165 * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if 1166 * property does not have a value, and -EILSEQ if the string is not 1167 * null-terminated within the length of the property data. 1168 * 1169 * The out_string pointer is modified only if a valid string can be decoded. 1170 */ 1171 static inline int of_property_read_string_index(const struct device_node *np, 1172 const char *propname, 1173 int index, const char **output) 1174 { 1175 int rc = of_property_read_string_helper(np, propname, output, 1, index); 1176 return rc < 0 ? rc : 0; 1177 } 1178 1179 /** 1180 * of_property_read_bool - Find a property 1181 * @np: device node from which the property value is to be read. 1182 * @propname: name of the property to be searched. 1183 * 1184 * Search for a property in a device node. 1185 * Returns true if the property exists false otherwise. 1186 */ 1187 static inline bool of_property_read_bool(const struct device_node *np, 1188 const char *propname) 1189 { 1190 struct property *prop = of_find_property(np, propname, NULL); 1191 1192 return prop ? true : false; 1193 } 1194 1195 static inline int of_property_read_u8(const struct device_node *np, 1196 const char *propname, 1197 u8 *out_value) 1198 { 1199 return of_property_read_u8_array(np, propname, out_value, 1); 1200 } 1201 1202 static inline int of_property_read_u16(const struct device_node *np, 1203 const char *propname, 1204 u16 *out_value) 1205 { 1206 return of_property_read_u16_array(np, propname, out_value, 1); 1207 } 1208 1209 static inline int of_property_read_u32(const struct device_node *np, 1210 const char *propname, 1211 u32 *out_value) 1212 { 1213 return of_property_read_u32_array(np, propname, out_value, 1); 1214 } 1215 1216 static inline int of_property_read_s32(const struct device_node *np, 1217 const char *propname, 1218 s32 *out_value) 1219 { 1220 return of_property_read_u32(np, propname, (u32*) out_value); 1221 } 1222 1223 #define of_for_each_phandle(it, err, np, ln, cn, cc) \ 1224 for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)), \ 1225 err = of_phandle_iterator_next(it); \ 1226 err == 0; \ 1227 err = of_phandle_iterator_next(it)) 1228 1229 #define of_property_for_each_u32(np, propname, prop, p, u) \ 1230 for (prop = of_find_property(np, propname, NULL), \ 1231 p = of_prop_next_u32(prop, NULL, &u); \ 1232 p; \ 1233 p = of_prop_next_u32(prop, p, &u)) 1234 1235 #define of_property_for_each_string(np, propname, prop, s) \ 1236 for (prop = of_find_property(np, propname, NULL), \ 1237 s = of_prop_next_string(prop, NULL); \ 1238 s; \ 1239 s = of_prop_next_string(prop, s)) 1240 1241 #define for_each_node_by_name(dn, name) \ 1242 for (dn = of_find_node_by_name(NULL, name); dn; \ 1243 dn = of_find_node_by_name(dn, name)) 1244 #define for_each_node_by_type(dn, type) \ 1245 for (dn = of_find_node_by_type(NULL, type); dn; \ 1246 dn = of_find_node_by_type(dn, type)) 1247 #define for_each_compatible_node(dn, type, compatible) \ 1248 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \ 1249 dn = of_find_compatible_node(dn, type, compatible)) 1250 #define for_each_matching_node(dn, matches) \ 1251 for (dn = of_find_matching_node(NULL, matches); dn; \ 1252 dn = of_find_matching_node(dn, matches)) 1253 #define for_each_matching_node_and_match(dn, matches, match) \ 1254 for (dn = of_find_matching_node_and_match(NULL, matches, match); \ 1255 dn; dn = of_find_matching_node_and_match(dn, matches, match)) 1256 1257 #define for_each_child_of_node(parent, child) \ 1258 for (child = of_get_next_child(parent, NULL); child != NULL; \ 1259 child = of_get_next_child(parent, child)) 1260 #define for_each_available_child_of_node(parent, child) \ 1261 for (child = of_get_next_available_child(parent, NULL); child != NULL; \ 1262 child = of_get_next_available_child(parent, child)) 1263 1264 #define for_each_of_cpu_node(cpu) \ 1265 for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \ 1266 cpu = of_get_next_cpu_node(cpu)) 1267 1268 #define for_each_node_with_property(dn, prop_name) \ 1269 for (dn = of_find_node_with_property(NULL, prop_name); dn; \ 1270 dn = of_find_node_with_property(dn, prop_name)) 1271 1272 static inline int of_get_child_count(const struct device_node *np) 1273 { 1274 struct device_node *child; 1275 int num = 0; 1276 1277 for_each_child_of_node(np, child) 1278 num++; 1279 1280 return num; 1281 } 1282 1283 static inline int of_get_available_child_count(const struct device_node *np) 1284 { 1285 struct device_node *child; 1286 int num = 0; 1287 1288 for_each_available_child_of_node(np, child) 1289 num++; 1290 1291 return num; 1292 } 1293 1294 #if defined(CONFIG_OF) && !defined(MODULE) 1295 #define _OF_DECLARE(table, name, compat, fn, fn_type) \ 1296 static const struct of_device_id __of_table_##name \ 1297 __used __section(__##table##_of_table) \ 1298 = { .compatible = compat, \ 1299 .data = (fn == (fn_type)NULL) ? fn : fn } 1300 #else 1301 #define _OF_DECLARE(table, name, compat, fn, fn_type) \ 1302 static const struct of_device_id __of_table_##name \ 1303 __attribute__((unused)) \ 1304 = { .compatible = compat, \ 1305 .data = (fn == (fn_type)NULL) ? fn : fn } 1306 #endif 1307 1308 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *); 1309 typedef int (*of_init_fn_1_ret)(struct device_node *); 1310 typedef void (*of_init_fn_1)(struct device_node *); 1311 1312 #define OF_DECLARE_1(table, name, compat, fn) \ 1313 _OF_DECLARE(table, name, compat, fn, of_init_fn_1) 1314 #define OF_DECLARE_1_RET(table, name, compat, fn) \ 1315 _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret) 1316 #define OF_DECLARE_2(table, name, compat, fn) \ 1317 _OF_DECLARE(table, name, compat, fn, of_init_fn_2) 1318 1319 /** 1320 * struct of_changeset_entry - Holds a changeset entry 1321 * 1322 * @node: list_head for the log list 1323 * @action: notifier action 1324 * @np: pointer to the device node affected 1325 * @prop: pointer to the property affected 1326 * @old_prop: hold a pointer to the original property 1327 * 1328 * Every modification of the device tree during a changeset 1329 * is held in a list of of_changeset_entry structures. 1330 * That way we can recover from a partial application, or we can 1331 * revert the changeset 1332 */ 1333 struct of_changeset_entry { 1334 struct list_head node; 1335 unsigned long action; 1336 struct device_node *np; 1337 struct property *prop; 1338 struct property *old_prop; 1339 }; 1340 1341 /** 1342 * struct of_changeset - changeset tracker structure 1343 * 1344 * @entries: list_head for the changeset entries 1345 * 1346 * changesets are a convenient way to apply bulk changes to the 1347 * live tree. In case of an error, changes are rolled-back. 1348 * changesets live on after initial application, and if not 1349 * destroyed after use, they can be reverted in one single call. 1350 */ 1351 struct of_changeset { 1352 struct list_head entries; 1353 }; 1354 1355 enum of_reconfig_change { 1356 OF_RECONFIG_NO_CHANGE = 0, 1357 OF_RECONFIG_CHANGE_ADD, 1358 OF_RECONFIG_CHANGE_REMOVE, 1359 }; 1360 1361 #ifdef CONFIG_OF_DYNAMIC 1362 extern int of_reconfig_notifier_register(struct notifier_block *); 1363 extern int of_reconfig_notifier_unregister(struct notifier_block *); 1364 extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd); 1365 extern int of_reconfig_get_state_change(unsigned long action, 1366 struct of_reconfig_data *arg); 1367 1368 extern void of_changeset_init(struct of_changeset *ocs); 1369 extern void of_changeset_destroy(struct of_changeset *ocs); 1370 extern int of_changeset_apply(struct of_changeset *ocs); 1371 extern int of_changeset_revert(struct of_changeset *ocs); 1372 extern int of_changeset_action(struct of_changeset *ocs, 1373 unsigned long action, struct device_node *np, 1374 struct property *prop); 1375 1376 static inline int of_changeset_attach_node(struct of_changeset *ocs, 1377 struct device_node *np) 1378 { 1379 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL); 1380 } 1381 1382 static inline int of_changeset_detach_node(struct of_changeset *ocs, 1383 struct device_node *np) 1384 { 1385 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL); 1386 } 1387 1388 static inline int of_changeset_add_property(struct of_changeset *ocs, 1389 struct device_node *np, struct property *prop) 1390 { 1391 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop); 1392 } 1393 1394 static inline int of_changeset_remove_property(struct of_changeset *ocs, 1395 struct device_node *np, struct property *prop) 1396 { 1397 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop); 1398 } 1399 1400 static inline int of_changeset_update_property(struct of_changeset *ocs, 1401 struct device_node *np, struct property *prop) 1402 { 1403 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop); 1404 } 1405 #else /* CONFIG_OF_DYNAMIC */ 1406 static inline int of_reconfig_notifier_register(struct notifier_block *nb) 1407 { 1408 return -EINVAL; 1409 } 1410 static inline int of_reconfig_notifier_unregister(struct notifier_block *nb) 1411 { 1412 return -EINVAL; 1413 } 1414 static inline int of_reconfig_notify(unsigned long action, 1415 struct of_reconfig_data *arg) 1416 { 1417 return -EINVAL; 1418 } 1419 static inline int of_reconfig_get_state_change(unsigned long action, 1420 struct of_reconfig_data *arg) 1421 { 1422 return -EINVAL; 1423 } 1424 #endif /* CONFIG_OF_DYNAMIC */ 1425 1426 /** 1427 * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node 1428 * @np: Pointer to the given device_node 1429 * 1430 * return true if present false otherwise 1431 */ 1432 static inline bool of_device_is_system_power_controller(const struct device_node *np) 1433 { 1434 return of_property_read_bool(np, "system-power-controller"); 1435 } 1436 1437 /** 1438 * Overlay support 1439 */ 1440 1441 enum of_overlay_notify_action { 1442 OF_OVERLAY_PRE_APPLY = 0, 1443 OF_OVERLAY_POST_APPLY, 1444 OF_OVERLAY_PRE_REMOVE, 1445 OF_OVERLAY_POST_REMOVE, 1446 }; 1447 1448 struct of_overlay_notify_data { 1449 struct device_node *overlay; 1450 struct device_node *target; 1451 }; 1452 1453 #ifdef CONFIG_OF_OVERLAY 1454 1455 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size, 1456 int *ovcs_id); 1457 int of_overlay_remove(int *ovcs_id); 1458 int of_overlay_remove_all(void); 1459 1460 int of_overlay_notifier_register(struct notifier_block *nb); 1461 int of_overlay_notifier_unregister(struct notifier_block *nb); 1462 1463 #else 1464 1465 static inline int of_overlay_fdt_apply(void *overlay_fdt, u32 overlay_fdt_size, 1466 int *ovcs_id) 1467 { 1468 return -ENOTSUPP; 1469 } 1470 1471 static inline int of_overlay_remove(int *ovcs_id) 1472 { 1473 return -ENOTSUPP; 1474 } 1475 1476 static inline int of_overlay_remove_all(void) 1477 { 1478 return -ENOTSUPP; 1479 } 1480 1481 static inline int of_overlay_notifier_register(struct notifier_block *nb) 1482 { 1483 return 0; 1484 } 1485 1486 static inline int of_overlay_notifier_unregister(struct notifier_block *nb) 1487 { 1488 return 0; 1489 } 1490 1491 #endif 1492 1493 #endif /* _LINUX_OF_H */ 1494