include/linux/of.h

   1 #ifndef _LINUX_OF_H
   2 #define _LINUX_OF_H
   3 /*
   4  * Definitions for talking to the Open Firmware PROM on
   5  * Power Macintosh and other computers.
   6  *
   7  * Copyright (C) 1996-2005 Paul Mackerras.
   8  *
   9  * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
  10  * Updates for SPARC64 by David S. Miller
  11  * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version
  16  * 2 of the License, or (at your option) any later version.
  17  */
  18 #include <linux/types.h>
  19 #include <linux/bitops.h>
  20 #include <linux/errno.h>
  21 #include <linux/kobject.h>
  22 #include <linux/mod_devicetable.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/topology.h>
  25 #include <linux/notifier.h>
  26
  27 #include <asm/byteorder.h>
  28 #include <asm/errno.h>
  29
  30 typedef u32 phandle;
  31 typedef u32 ihandle;
  32
  33 struct property {
  34         char    *name;
  35         int     length;
  36         void    *value;
  37         struct property *next;
  38         unsigned long _flags;
  39         unsigned int unique_id;
  40         struct bin_attribute attr;
  41 };
  42
  43 #if defined(CONFIG_SPARC)
  44 struct of_irq_controller;
  45 #endif
  46
  47 struct device_node {
  48         const char *name;
  49         const char *type;
  50         phandle phandle;
  51         const char *full_name;
  52
  53         struct  property *properties;
  54         struct  property *deadprops;    /* removed properties */
  55         struct  device_node *parent;
  56         struct  device_node *child;
  57         struct  device_node *sibling;
  58         struct  device_node *next;      /* next device of same type */
  59         struct  device_node *allnext;   /* next in list of all nodes */
  60         struct  kobject kobj;
  61         unsigned long _flags;
  62         void    *data;
  63 #if defined(CONFIG_SPARC)
  64         const char *path_component_name;
  65         unsigned int unique_id;
  66         struct of_irq_controller *irq_trans;
  67 #endif
  68 };
  69
  70 #define MAX_PHANDLE_ARGS 16
  71 struct of_phandle_args {
  72         struct device_node *np;
  73         int args_count;
  74         uint32_t args[MAX_PHANDLE_ARGS];
  75 };
  76
  77 /* initialize a node */
  78 extern struct kobj_type of_node_ktype;
  79 static inline void of_node_init(struct device_node *node)
  80 {
  81         kobject_init(&node->kobj, &of_node_ktype);
  82 }
  83
  84 /* true when node is initialized */
  85 static inline int of_node_is_initialized(struct device_node *node)
  86 {
  87         return node && node->kobj.state_initialized;
  88 }
  89
  90 /* true when node is attached (i.e. present on sysfs) */
  91 static inline int of_node_is_attached(struct device_node *node)
  92 {
  93         return node && node->kobj.state_in_sysfs;
  94 }
  95
  96 #ifdef CONFIG_OF_DYNAMIC
  97 extern struct device_node *of_node_get(struct device_node *node);
  98 extern void of_node_put(struct device_node *node);
  99 #else /* CONFIG_OF_DYNAMIC */
 100 /* Dummy ref counting routines - to be implemented later */
 101 static inline struct device_node *of_node_get(struct device_node *node)
 102 {
 103         return node;
 104 }
 105 static inline void of_node_put(struct device_node *node) { }
 106 #endif /* !CONFIG_OF_DYNAMIC */
 107
 108 #ifdef CONFIG_OF
 109
 110 /* Pointer for first entry in chain of all nodes. */
 111 extern struct device_node *of_allnodes;
 112 extern struct device_node *of_chosen;
 113 extern struct device_node *of_aliases;
 114 extern struct device_node *of_stdout;
 115 extern raw_spinlock_t devtree_lock;
 116
 117 static inline bool of_have_populated_dt(void)
 118 {
 119         return of_allnodes != NULL;
 120 }
 121
 122 static inline bool of_node_is_root(const struct device_node *node)
 123 {
 124         return node && (node->parent == NULL);
 125 }
 126
 127 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
 128 {
 129         return test_bit(flag, &n->_flags);
 130 }
 131
 132 static inline int of_node_test_and_set_flag(struct device_node *n,
 133                                             unsigned long flag)
 134 {
 135         return test_and_set_bit(flag, &n->_flags);
 136 }
 137
 138 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
 139 {
 140         set_bit(flag, &n->_flags);
 141 }
 142
 143 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
 144 {
 145         clear_bit(flag, &n->_flags);
 146 }
 147
 148 static inline int of_property_check_flag(struct property *p, unsigned long flag)
 149 {
 150         return test_bit(flag, &p->_flags);
 151 }
 152
 153 static inline void of_property_set_flag(struct property *p, unsigned long flag)
 154 {
 155         set_bit(flag, &p->_flags);
 156 }
 157
 158 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
 159 {
 160         clear_bit(flag, &p->_flags);
 161 }
 162
 163 extern struct device_node *of_find_all_nodes(struct device_node *prev);
 164
 165 /*
 166  * OF address retrieval & translation
 167  */
 168
 169 /* Helper to read a big number; size is in cells (not bytes) */
 170 static inline u64 of_read_number(const __be32 *cell, int size)
 171 {
 172         u64 r = 0;
 173         while (size--)
 174                 r = (r << 32) | be32_to_cpu(*(cell++));
 175         return r;
 176 }
 177
 178 /* Like of_read_number, but we want an unsigned long result */
 179 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 180 {
 181         /* toss away upper bits if unsigned long is smaller than u64 */
 182         return of_read_number(cell, size);
 183 }
 184
 185 #if defined(CONFIG_SPARC)
 186 #include <asm/prom.h>
 187 #endif
 188
 189 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 190 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 191 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 192 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 193 #endif
 194
 195 /* Default string compare functions, Allow arch asm/prom.h to override */
 196 #if !defined(of_compat_cmp)
 197 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 198 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 199 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 200 #endif
 201
 202 /* flag descriptions */
 203 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 204 #define OF_DETACHED     2 /* node has been detached from the device tree */
 205 #define OF_POPULATED    3 /* device already created for the node */
 206 #define OF_POPULATED_BUS        4 /* of_platform_populate recursed to children of this node */
 207
 208 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 209 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 210
 211 #define OF_BAD_ADDR     ((u64)-1)
 212
 213 static inline const char *of_node_full_name(const struct device_node *np)
 214 {
 215         return np ? np->full_name : "<no-node>";
 216 }
 217
 218 #define for_each_of_allnodes(dn) \
 219         for (dn = of_allnodes; dn; dn = dn->allnext)
 220 extern struct device_node *of_find_node_by_name(struct device_node *from,
 221         const char *name);
 222 extern struct device_node *of_find_node_by_type(struct device_node *from,
 223         const char *type);
 224 extern struct device_node *of_find_compatible_node(struct device_node *from,
 225         const char *type, const char *compat);
 226 extern struct device_node *of_find_matching_node_and_match(
 227         struct device_node *from,
 228         const struct of_device_id *matches,
 229         const struct of_device_id **match);
 230
 231 extern struct device_node *of_find_node_by_path(const char *path);
 232 extern struct device_node *of_find_node_by_phandle(phandle handle);
 233 extern struct device_node *of_get_parent(const struct device_node *node);
 234 extern struct device_node *of_get_next_parent(struct device_node *node);
 235 extern struct device_node *of_get_next_child(const struct device_node *node,
 236                                              struct device_node *prev);
 237 extern struct device_node *of_get_next_available_child(
 238         const struct device_node *node, struct device_node *prev);
 239
 240 extern struct device_node *of_get_child_by_name(const struct device_node *node,
 241                                         const char *name);
 242
 243 /* cache lookup */
 244 extern struct device_node *of_find_next_cache_node(const struct device_node *);
 245 extern struct device_node *of_find_node_with_property(
 246         struct device_node *from, const char *prop_name);
 247
 248 extern struct property *of_find_property(const struct device_node *np,
 249                                          const char *name,
 250                                          int *lenp);
 251 extern int of_property_count_elems_of_size(const struct device_node *np,
 252                                 const char *propname, int elem_size);
 253 extern int of_property_read_u32_index(const struct device_node *np,
 254                                        const char *propname,
 255                                        u32 index, u32 *out_value);
 256 extern int of_property_read_u8_array(const struct device_node *np,
 257                         const char *propname, u8 *out_values, size_t sz);
 258 extern int of_property_read_u16_array(const struct device_node *np,
 259                         const char *propname, u16 *out_values, size_t sz);
 260 extern int of_property_read_u32_array(const struct device_node *np,
 261                                       const char *propname,
 262                                       u32 *out_values,
 263                                       size_t sz);
 264 extern int of_property_read_u64(const struct device_node *np,
 265                                 const char *propname, u64 *out_value);
 266
 267 extern int of_property_read_string(struct device_node *np,
 268                                    const char *propname,
 269                                    const char **out_string);
 270 extern int of_property_read_string_index(struct device_node *np,
 271                                          const char *propname,
 272                                          int index, const char **output);
 273 extern int of_property_match_string(struct device_node *np,
 274                                     const char *propname,
 275                                     const char *string);
 276 extern int of_property_count_strings(struct device_node *np,
 277                                      const char *propname);
 278 extern int of_device_is_compatible(const struct device_node *device,
 279                                    const char *);
 280 extern int of_device_is_available(const struct device_node *device);
 281 extern const void *of_get_property(const struct device_node *node,
 282                                 const char *name,
 283                                 int *lenp);
 284 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 285 #define for_each_property_of_node(dn, pp) \
 286         for (pp = dn->properties; pp != NULL; pp = pp->next)
 287
 288 extern int of_n_addr_cells(struct device_node *np);
 289 extern int of_n_size_cells(struct device_node *np);
 290 extern const struct of_device_id *of_match_node(
 291         const struct of_device_id *matches, const struct device_node *node);
 292 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 293 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
 294 extern struct device_node *of_parse_phandle(const struct device_node *np,
 295                                             const char *phandle_name,
 296                                             int index);
 297 extern int of_parse_phandle_with_args(const struct device_node *np,
 298         const char *list_name, const char *cells_name, int index,
 299         struct of_phandle_args *out_args);
 300 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
 301         const char *list_name, int cells_count, int index,
 302         struct of_phandle_args *out_args);
 303 extern int of_count_phandle_with_args(const struct device_node *np,
 304         const char *list_name, const char *cells_name);
 305
 306 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
 307 extern int of_alias_get_id(struct device_node *np, const char *stem);
 308
 309 extern int of_machine_is_compatible(const char *compat);
 310
 311 extern int of_add_property(struct device_node *np, struct property *prop);
 312 extern int of_remove_property(struct device_node *np, struct property *prop);
 313 extern int of_update_property(struct device_node *np, struct property *newprop);
 314
 315 /* For updating the device tree at runtime */
 316 #define OF_RECONFIG_ATTACH_NODE         0x0001
 317 #define OF_RECONFIG_DETACH_NODE         0x0002
 318 #define OF_RECONFIG_ADD_PROPERTY        0x0003
 319 #define OF_RECONFIG_REMOVE_PROPERTY     0x0004
 320 #define OF_RECONFIG_UPDATE_PROPERTY     0x0005
 321
 322 struct of_prop_reconfig {
 323         struct device_node      *dn;
 324         struct property         *prop;
 325         struct property         *old_prop;
 326 };
 327
 328 extern int of_reconfig_notifier_register(struct notifier_block *);
 329 extern int of_reconfig_notifier_unregister(struct notifier_block *);
 330 extern int of_reconfig_notify(unsigned long, void *);
 331
 332 extern int of_attach_node(struct device_node *);
 333 extern int of_detach_node(struct device_node *);
 334
 335 #define of_match_ptr(_ptr)      (_ptr)
 336
 337 /*
 338  * struct property *prop;
 339  * const __be32 *p;
 340  * u32 u;
 341  *
 342  * of_property_for_each_u32(np, "propname", prop, p, u)
 343  *         printk("U32 value: %x\n", u);
 344  */
 345 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
 346                                u32 *pu);
 347 /*
 348  * struct property *prop;
 349  * const char *s;
 350  *
 351  * of_property_for_each_string(np, "propname", prop, s)
 352  *         printk("String value: %s\n", s);
 353  */
 354 const char *of_prop_next_string(struct property *prop, const char *cur);
 355
 356 bool of_console_check(struct device_node *dn, char *name, int index);
 357
 358 #else /* CONFIG_OF */
 359
 360 static inline const char* of_node_full_name(const struct device_node *np)
 361 {
 362         return "<no-node>";
 363 }
 364
 365 static inline struct device_node *of_find_node_by_name(struct device_node *from,
 366         const char *name)
 367 {
 368         return NULL;
 369 }
 370
 371 static inline struct device_node *of_find_node_by_type(struct device_node *from,
 372         const char *type)
 373 {
 374         return NULL;
 375 }
 376
 377 static inline struct device_node *of_find_matching_node_and_match(
 378         struct device_node *from,
 379         const struct of_device_id *matches,
 380         const struct of_device_id **match)
 381 {
 382         return NULL;
 383 }
 384
 385 static inline struct device_node *of_find_node_by_path(const char *path)
 386 {
 387         return NULL;
 388 }
 389
 390 static inline struct device_node *of_get_parent(const struct device_node *node)
 391 {
 392         return NULL;
 393 }
 394
 395 static inline struct device_node *of_get_next_child(
 396         const struct device_node *node, struct device_node *prev)
 397 {
 398         return NULL;
 399 }
 400
 401 static inline struct device_node *of_get_next_available_child(
 402         const struct device_node *node, struct device_node *prev)
 403 {
 404         return NULL;
 405 }
 406
 407 static inline struct device_node *of_find_node_with_property(
 408         struct device_node *from, const char *prop_name)
 409 {
 410         return NULL;
 411 }
 412
 413 static inline bool of_have_populated_dt(void)
 414 {
 415         return false;
 416 }
 417
 418 static inline struct device_node *of_get_child_by_name(
 419                                         const struct device_node *node,
 420                                         const char *name)
 421 {
 422         return NULL;
 423 }
 424
 425 static inline int of_device_is_compatible(const struct device_node *device,
 426                                           const char *name)
 427 {
 428         return 0;
 429 }
 430
 431 static inline int of_device_is_available(const struct device_node *device)
 432 {
 433         return 0;
 434 }
 435
 436 static inline struct property *of_find_property(const struct device_node *np,
 437                                                 const char *name,
 438                                                 int *lenp)
 439 {
 440         return NULL;
 441 }
 442
 443 static inline struct device_node *of_find_compatible_node(
 444                                                 struct device_node *from,
 445                                                 const char *type,
 446                                                 const char *compat)
 447 {
 448         return NULL;
 449 }
 450
 451 static inline int of_property_count_elems_of_size(const struct device_node *np,
 452                         const char *propname, int elem_size)
 453 {
 454         return -ENOSYS;
 455 }
 456
 457 static inline int of_property_read_u32_index(const struct device_node *np,
 458                         const char *propname, u32 index, u32 *out_value)
 459 {
 460         return -ENOSYS;
 461 }
 462
 463 static inline int of_property_read_u8_array(const struct device_node *np,
 464                         const char *propname, u8 *out_values, size_t sz)
 465 {
 466         return -ENOSYS;
 467 }
 468
 469 static inline int of_property_read_u16_array(const struct device_node *np,
 470                         const char *propname, u16 *out_values, size_t sz)
 471 {
 472         return -ENOSYS;
 473 }
 474
 475 static inline int of_property_read_u32_array(const struct device_node *np,
 476                                              const char *propname,
 477                                              u32 *out_values, size_t sz)
 478 {
 479         return -ENOSYS;
 480 }
 481
 482 static inline int of_property_read_string(struct device_node *np,
 483                                           const char *propname,
 484                                           const char **out_string)
 485 {
 486         return -ENOSYS;
 487 }
 488
 489 static inline int of_property_read_string_index(struct device_node *np,
 490                                                 const char *propname, int index,
 491                                                 const char **out_string)
 492 {
 493         return -ENOSYS;
 494 }
 495
 496 static inline int of_property_count_strings(struct device_node *np,
 497                                             const char *propname)
 498 {
 499         return -ENOSYS;
 500 }
 501
 502 static inline const void *of_get_property(const struct device_node *node,
 503                                 const char *name,
 504                                 int *lenp)
 505 {
 506         return NULL;
 507 }
 508
 509 static inline struct device_node *of_get_cpu_node(int cpu,
 510                                         unsigned int *thread)
 511 {
 512         return NULL;
 513 }
 514
 515 static inline int of_property_read_u64(const struct device_node *np,
 516                                        const char *propname, u64 *out_value)
 517 {
 518         return -ENOSYS;
 519 }
 520
 521 static inline int of_property_match_string(struct device_node *np,
 522                                            const char *propname,
 523                                            const char *string)
 524 {
 525         return -ENOSYS;
 526 }
 527
 528 static inline struct device_node *of_parse_phandle(const struct device_node *np,
 529                                                    const char *phandle_name,
 530                                                    int index)
 531 {
 532         return NULL;
 533 }
 534
 535 static inline int of_parse_phandle_with_args(struct device_node *np,
 536                                              const char *list_name,
 537                                              const char *cells_name,
 538                                              int index,
 539                                              struct of_phandle_args *out_args)
 540 {
 541         return -ENOSYS;
 542 }
 543
 544 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
 545         const char *list_name, int cells_count, int index,
 546         struct of_phandle_args *out_args)
 547 {
 548         return -ENOSYS;
 549 }
 550
 551 static inline int of_count_phandle_with_args(struct device_node *np,
 552                                              const char *list_name,
 553                                              const char *cells_name)
 554 {
 555         return -ENOSYS;
 556 }
 557
 558 static inline int of_alias_get_id(struct device_node *np, const char *stem)
 559 {
 560         return -ENOSYS;
 561 }
 562
 563 static inline int of_machine_is_compatible(const char *compat)
 564 {
 565         return 0;
 566 }
 567
 568 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
 569 {
 570         return false;
 571 }
 572
 573 static inline const __be32 *of_prop_next_u32(struct property *prop,
 574                 const __be32 *cur, u32 *pu)
 575 {
 576         return NULL;
 577 }
 578
 579 static inline const char *of_prop_next_string(struct property *prop,
 580                 const char *cur)
 581 {
 582         return NULL;
 583 }
 584
 585 #define of_match_ptr(_ptr)      NULL
 586 #define of_match_node(_matches, _node)  NULL
 587 #endif /* CONFIG_OF */
 588
 589 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
 590 extern int of_node_to_nid(struct device_node *np);
 591 #else
 592 static inline int of_node_to_nid(struct device_node *device) { return 0; }
 593 #endif
 594
 595 static inline struct device_node *of_find_matching_node(
 596         struct device_node *from,
 597         const struct of_device_id *matches)
 598 {
 599         return of_find_matching_node_and_match(from, matches, NULL);
 600 }
 601
 602 /**
 603  * of_property_count_u8_elems - Count the number of u8 elements in a property
 604  *
 605  * @np:         device node from which the property value is to be read.
 606  * @propname:   name of the property to be searched.
 607  *
 608  * Search for a property in a device node and count the number of u8 elements
 609  * in it. Returns number of elements on sucess, -EINVAL if the property does
 610  * not exist or its length does not match a multiple of u8 and -ENODATA if the
 611  * property does not have a value.
 612  */
 613 static inline int of_property_count_u8_elems(const struct device_node *np,
 614                                 const char *propname)
 615 {
 616         return of_property_count_elems_of_size(np, propname, sizeof(u8));
 617 }
 618
 619 /**
 620  * of_property_count_u16_elems - Count the number of u16 elements in a property
 621  *
 622  * @np:         device node from which the property value is to be read.
 623  * @propname:   name of the property to be searched.
 624  *
 625  * Search for a property in a device node and count the number of u16 elements
 626  * in it. Returns number of elements on sucess, -EINVAL if the property does
 627  * not exist or its length does not match a multiple of u16 and -ENODATA if the
 628  * property does not have a value.
 629  */
 630 static inline int of_property_count_u16_elems(const struct device_node *np,
 631                                 const char *propname)
 632 {
 633         return of_property_count_elems_of_size(np, propname, sizeof(u16));
 634 }
 635
 636 /**
 637  * of_property_count_u32_elems - Count the number of u32 elements in a property
 638  *
 639  * @np:         device node from which the property value is to be read.
 640  * @propname:   name of the property to be searched.
 641  *
 642  * Search for a property in a device node and count the number of u32 elements
 643  * in it. Returns number of elements on sucess, -EINVAL if the property does
 644  * not exist or its length does not match a multiple of u32 and -ENODATA if the
 645  * property does not have a value.
 646  */
 647 static inline int of_property_count_u32_elems(const struct device_node *np,
 648                                 const char *propname)
 649 {
 650         return of_property_count_elems_of_size(np, propname, sizeof(u32));
 651 }
 652
 653 /**
 654  * of_property_count_u64_elems - Count the number of u64 elements in a property
 655  *
 656  * @np:         device node from which the property value is to be read.
 657  * @propname:   name of the property to be searched.
 658  *
 659  * Search for a property in a device node and count the number of u64 elements
 660  * in it. Returns number of elements on sucess, -EINVAL if the property does
 661  * not exist or its length does not match a multiple of u64 and -ENODATA if the
 662  * property does not have a value.
 663  */
 664 static inline int of_property_count_u64_elems(const struct device_node *np,
 665                                 const char *propname)
 666 {
 667         return of_property_count_elems_of_size(np, propname, sizeof(u64));
 668 }
 669
 670 /**
 671  * of_property_read_bool - Findfrom a property
 672  * @np:         device node from which the property value is to be read.
 673  * @propname:   name of the property to be searched.
 674  *
 675  * Search for a property in a device node.
 676  * Returns true if the property exist false otherwise.
 677  */
 678 static inline bool of_property_read_bool(const struct device_node *np,
 679                                          const char *propname)
 680 {
 681         struct property *prop = of_find_property(np, propname, NULL);
 682
 683         return prop ? true : false;
 684 }
 685
 686 static inline int of_property_read_u8(const struct device_node *np,
 687                                        const char *propname,
 688                                        u8 *out_value)
 689 {
 690         return of_property_read_u8_array(np, propname, out_value, 1);
 691 }
 692
 693 static inline int of_property_read_u16(const struct device_node *np,
 694                                        const char *propname,
 695                                        u16 *out_value)
 696 {
 697         return of_property_read_u16_array(np, propname, out_value, 1);
 698 }
 699
 700 static inline int of_property_read_u32(const struct device_node *np,
 701                                        const char *propname,
 702                                        u32 *out_value)
 703 {
 704         return of_property_read_u32_array(np, propname, out_value, 1);
 705 }
 706
 707 #define of_property_for_each_u32(np, propname, prop, p, u)      \
 708         for (prop = of_find_property(np, propname, NULL),       \
 709                 p = of_prop_next_u32(prop, NULL, &u);           \
 710                 p;                                              \
 711                 p = of_prop_next_u32(prop, p, &u))
 712
 713 #define of_property_for_each_string(np, propname, prop, s)      \
 714         for (prop = of_find_property(np, propname, NULL),       \
 715                 s = of_prop_next_string(prop, NULL);            \
 716                 s;                                              \
 717                 s = of_prop_next_string(prop, s))
 718
 719 #define for_each_node_by_name(dn, name) \
 720         for (dn = of_find_node_by_name(NULL, name); dn; \
 721              dn = of_find_node_by_name(dn, name))
 722 #define for_each_node_by_type(dn, type) \
 723         for (dn = of_find_node_by_type(NULL, type); dn; \
 724              dn = of_find_node_by_type(dn, type))
 725 #define for_each_compatible_node(dn, type, compatible) \
 726         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 727              dn = of_find_compatible_node(dn, type, compatible))
 728 #define for_each_matching_node(dn, matches) \
 729         for (dn = of_find_matching_node(NULL, matches); dn; \
 730              dn = of_find_matching_node(dn, matches))
 731 #define for_each_matching_node_and_match(dn, matches, match) \
 732         for (dn = of_find_matching_node_and_match(NULL, matches, match); \
 733              dn; dn = of_find_matching_node_and_match(dn, matches, match))
 734
 735 #define for_each_child_of_node(parent, child) \
 736         for (child = of_get_next_child(parent, NULL); child != NULL; \
 737              child = of_get_next_child(parent, child))
 738 #define for_each_available_child_of_node(parent, child) \
 739         for (child = of_get_next_available_child(parent, NULL); child != NULL; \
 740              child = of_get_next_available_child(parent, child))
 741
 742 #define for_each_node_with_property(dn, prop_name) \
 743         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 744              dn = of_find_node_with_property(dn, prop_name))
 745
 746 static inline int of_get_child_count(const struct device_node *np)
 747 {
 748         struct device_node *child;
 749         int num = 0;
 750
 751         for_each_child_of_node(np, child)
 752                 num++;
 753
 754         return num;
 755 }
 756
 757 static inline int of_get_available_child_count(const struct device_node *np)
 758 {
 759         struct device_node *child;
 760         int num = 0;
 761
 762         for_each_available_child_of_node(np, child)
 763                 num++;
 764
 765         return num;
 766 }
 767
 768 #ifdef CONFIG_OF
 769 #define _OF_DECLARE(table, name, compat, fn, fn_type)                   \
 770         static const struct of_device_id __of_table_##name              \
 771                 __used __section(__##table##_of_table)                  \
 772                  = { .compatible = compat,                              \
 773                      .data = (fn == (fn_type)NULL) ? fn : fn  }
 774 #else
 775 #define _OF_DECLARE(table, name, compat, fn, fn_type)                                   \
 776         static const struct of_device_id __of_table_##name              \
 777                 __attribute__((unused))                                 \
 778                  = { .compatible = compat,                              \
 779                      .data = (fn == (fn_type)NULL) ? fn : fn }
 780 #endif
 781
 782 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
 783 typedef void (*of_init_fn_1)(struct device_node *);
 784
 785 #define OF_DECLARE_1(table, name, compat, fn) \
 786                 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
 787 #define OF_DECLARE_2(table, name, compat, fn) \
 788                 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
 789
 790 /**
 791  * struct of_changeset_entry    - Holds a changeset entry
 792  *
 793  * @node:       list_head for the log list
 794  * @action:     notifier action
 795  * @np:         pointer to the device node affected
 796  * @prop:       pointer to the property affected
 797  * @old_prop:   hold a pointer to the original property
 798  *
 799  * Every modification of the device tree during a changeset
 800  * is held in a list of of_changeset_entry structures.
 801  * That way we can recover from a partial application, or we can
 802  * revert the changeset
 803  */
 804 struct of_changeset_entry {
 805         struct list_head node;
 806         unsigned long action;
 807         struct device_node *np;
 808         struct property *prop;
 809         struct property *old_prop;
 810 };
 811
 812 /**
 813  * struct of_changeset - changeset tracker structure
 814  *
 815  * @entries:    list_head for the changeset entries
 816  *
 817  * changesets are a convenient way to apply bulk changes to the
 818  * live tree. In case of an error, changes are rolled-back.
 819  * changesets live on after initial application, and if not
 820  * destroyed after use, they can be reverted in one single call.
 821  */
 822 struct of_changeset {
 823         struct list_head entries;
 824 };
 825
 826 #ifdef CONFIG_OF_DYNAMIC
 827 extern void of_changeset_init(struct of_changeset *ocs);
 828 extern void of_changeset_destroy(struct of_changeset *ocs);
 829 extern int of_changeset_apply(struct of_changeset *ocs);
 830 extern int of_changeset_revert(struct of_changeset *ocs);
 831 extern int of_changeset_action(struct of_changeset *ocs,
 832                 unsigned long action, struct device_node *np,
 833                 struct property *prop);
 834
 835 static inline int of_changeset_attach_node(struct of_changeset *ocs,
 836                 struct device_node *np)
 837 {
 838         return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
 839 }
 840
 841 static inline int of_changeset_detach_node(struct of_changeset *ocs,
 842                 struct device_node *np)
 843 {
 844         return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
 845 }
 846
 847 static inline int of_changeset_add_property(struct of_changeset *ocs,
 848                 struct device_node *np, struct property *prop)
 849 {
 850         return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
 851 }
 852
 853 static inline int of_changeset_remove_property(struct of_changeset *ocs,
 854                 struct device_node *np, struct property *prop)
 855 {
 856         return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
 857 }
 858
 859 static inline int of_changeset_update_property(struct of_changeset *ocs,
 860                 struct device_node *np, struct property *prop)
 861 {
 862         return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
 863 }
 864 #endif
 865
 866 #endif /* _LINUX_OF_H */