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 extern int of_node_add(struct device_node *node);
  78
  79 /* initialize a node */
  80 extern struct kobj_type of_node_ktype;
  81 static inline void of_node_init(struct device_node *node)
  82 {
  83         kobject_init(&node->kobj, &of_node_ktype);
  84 }
  85
  86 /* true when node is initialized */
  87 static inline int of_node_is_initialized(struct device_node *node)
  88 {
  89         return node && node->kobj.state_initialized;
  90 }
  91
  92 /* true when node is attached (i.e. present on sysfs) */
  93 static inline int of_node_is_attached(struct device_node *node)
  94 {
  95         return node && node->kobj.state_in_sysfs;
  96 }
  97
  98 #ifdef CONFIG_OF_DYNAMIC
  99 extern struct device_node *of_node_get(struct device_node *node);
 100 extern void of_node_put(struct device_node *node);
 101 #else /* CONFIG_OF_DYNAMIC */
 102 /* Dummy ref counting routines - to be implemented later */
 103 static inline struct device_node *of_node_get(struct device_node *node)
 104 {
 105         return node;
 106 }
 107 static inline void of_node_put(struct device_node *node) { }
 108 #endif /* !CONFIG_OF_DYNAMIC */
 109
 110 #ifdef CONFIG_OF
 111
 112 /* Pointer for first entry in chain of all nodes. */
 113 extern struct device_node *of_allnodes;
 114 extern struct device_node *of_chosen;
 115 extern struct device_node *of_aliases;
 116 extern raw_spinlock_t devtree_lock;
 117
 118 static inline bool of_have_populated_dt(void)
 119 {
 120         return of_allnodes != NULL;
 121 }
 122
 123 static inline bool of_node_is_root(const struct device_node *node)
 124 {
 125         return node && (node->parent == NULL);
 126 }
 127
 128 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
 129 {
 130         return test_bit(flag, &n->_flags);
 131 }
 132
 133 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
 134 {
 135         set_bit(flag, &n->_flags);
 136 }
 137
 138 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
 139 {
 140         clear_bit(flag, &n->_flags);
 141 }
 142
 143 static inline int of_property_check_flag(struct property *p, unsigned long flag)
 144 {
 145         return test_bit(flag, &p->_flags);
 146 }
 147
 148 static inline void of_property_set_flag(struct property *p, unsigned long flag)
 149 {
 150         set_bit(flag, &p->_flags);
 151 }
 152
 153 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
 154 {
 155         clear_bit(flag, &p->_flags);
 156 }
 157
 158 extern struct device_node *of_find_all_nodes(struct device_node *prev);
 159
 160 /*
 161  * OF address retrieval & translation
 162  */
 163
 164 /* Helper to read a big number; size is in cells (not bytes) */
 165 static inline u64 of_read_number(const __be32 *cell, int size)
 166 {
 167         u64 r = 0;
 168         while (size--)
 169                 r = (r << 32) | be32_to_cpu(*(cell++));
 170         return r;
 171 }
 172
 173 /* Like of_read_number, but we want an unsigned long result */
 174 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 175 {
 176         /* toss away upper bits if unsigned long is smaller than u64 */
 177         return of_read_number(cell, size);
 178 }
 179
 180 #if defined(CONFIG_SPARC)
 181 #include <asm/prom.h>
 182 #endif
 183
 184 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 185 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 186 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 187 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 188 #endif
 189
 190 /* Default string compare functions, Allow arch asm/prom.h to override */
 191 #if !defined(of_compat_cmp)
 192 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 193 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 194 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 195 #endif
 196
 197 /* flag descriptions */
 198 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 199 #define OF_DETACHED     2 /* node has been detached from the device tree */
 200
 201 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 202 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 203
 204 #define OF_BAD_ADDR     ((u64)-1)
 205
 206 static inline const char *of_node_full_name(const struct device_node *np)
 207 {
 208         return np ? np->full_name : "<no-node>";
 209 }
 210
 211 #define for_each_of_allnodes(dn) \
 212         for (dn = of_allnodes; dn; dn = dn->allnext)
 213 extern struct device_node *of_find_node_by_name(struct device_node *from,
 214         const char *name);
 215 extern struct device_node *of_find_node_by_type(struct device_node *from,
 216         const char *type);
 217 extern struct device_node *of_find_compatible_node(struct device_node *from,
 218         const char *type, const char *compat);
 219 extern struct device_node *of_find_matching_node_and_match(
 220         struct device_node *from,
 221         const struct of_device_id *matches,
 222         const struct of_device_id **match);
 223
 224 extern struct device_node *of_find_node_by_path(const char *path);
 225 extern struct device_node *of_find_node_by_phandle(phandle handle);
 226 extern struct device_node *of_get_parent(const struct device_node *node);
 227 extern struct device_node *of_get_next_parent(struct device_node *node);
 228 extern struct device_node *of_get_next_child(const struct device_node *node,
 229                                              struct device_node *prev);
 230 extern struct device_node *of_get_next_available_child(
 231         const struct device_node *node, struct device_node *prev);
 232
 233 extern struct device_node *of_get_child_by_name(const struct device_node *node,
 234                                         const char *name);
 235
 236 /* cache lookup */
 237 extern struct device_node *of_find_next_cache_node(const struct device_node *);
 238 extern struct device_node *of_find_node_with_property(
 239         struct device_node *from, const char *prop_name);
 240
 241 extern struct property *of_find_property(const struct device_node *np,
 242                                          const char *name,
 243                                          int *lenp);
 244 extern int of_property_count_elems_of_size(const struct device_node *np,
 245                                 const char *propname, int elem_size);
 246 extern int of_property_read_u32_index(const struct device_node *np,
 247                                        const char *propname,
 248                                        u32 index, u32 *out_value);
 249 extern int of_property_read_u8_array(const struct device_node *np,
 250                         const char *propname, u8 *out_values, size_t sz);
 251 extern int of_property_read_u16_array(const struct device_node *np,
 252                         const char *propname, u16 *out_values, size_t sz);
 253 extern int of_property_read_u32_array(const struct device_node *np,
 254                                       const char *propname,
 255                                       u32 *out_values,
 256                                       size_t sz);
 257 extern int of_property_read_u64(const struct device_node *np,
 258                                 const char *propname, u64 *out_value);
 259
 260 extern int of_property_read_string(struct device_node *np,
 261                                    const char *propname,
 262                                    const char **out_string);
 263 extern int of_property_read_string_index(struct device_node *np,
 264                                          const char *propname,
 265                                          int index, const char **output);
 266 extern int of_property_match_string(struct device_node *np,
 267                                     const char *propname,
 268                                     const char *string);
 269 extern int of_property_count_strings(struct device_node *np,
 270                                      const char *propname);
 271 extern int of_device_is_compatible(const struct device_node *device,
 272                                    const char *);
 273 extern int of_device_is_available(const struct device_node *device);
 274 extern const void *of_get_property(const struct device_node *node,
 275                                 const char *name,
 276                                 int *lenp);
 277 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 278 #define for_each_property_of_node(dn, pp) \
 279         for (pp = dn->properties; pp != NULL; pp = pp->next)
 280
 281 extern int of_n_addr_cells(struct device_node *np);
 282 extern int of_n_size_cells(struct device_node *np);
 283 extern const struct of_device_id *of_match_node(
 284         const struct of_device_id *matches, const struct device_node *node);
 285 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 286 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
 287 extern struct device_node *of_parse_phandle(const struct device_node *np,
 288                                             const char *phandle_name,
 289                                             int index);
 290 extern int of_parse_phandle_with_args(const struct device_node *np,
 291         const char *list_name, const char *cells_name, int index,
 292         struct of_phandle_args *out_args);
 293 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
 294         const char *list_name, int cells_count, int index,
 295         struct of_phandle_args *out_args);
 296 extern int of_count_phandle_with_args(const struct device_node *np,
 297         const char *list_name, const char *cells_name);
 298
 299 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
 300 extern int of_alias_get_id(struct device_node *np, const char *stem);
 301
 302 extern int of_machine_is_compatible(const char *compat);
 303
 304 extern int of_add_property(struct device_node *np, struct property *prop);
 305 extern int of_remove_property(struct device_node *np, struct property *prop);
 306 extern int of_update_property(struct device_node *np, struct property *newprop);
 307
 308 /* For updating the device tree at runtime */
 309 #define OF_RECONFIG_ATTACH_NODE         0x0001
 310 #define OF_RECONFIG_DETACH_NODE         0x0002
 311 #define OF_RECONFIG_ADD_PROPERTY        0x0003
 312 #define OF_RECONFIG_REMOVE_PROPERTY     0x0004
 313 #define OF_RECONFIG_UPDATE_PROPERTY     0x0005
 314
 315 struct of_prop_reconfig {
 316         struct device_node      *dn;
 317         struct property         *prop;
 318 };
 319
 320 extern int of_reconfig_notifier_register(struct notifier_block *);
 321 extern int of_reconfig_notifier_unregister(struct notifier_block *);
 322 extern int of_reconfig_notify(unsigned long, void *);
 323
 324 extern int of_attach_node(struct device_node *);
 325 extern int of_detach_node(struct device_node *);
 326
 327 #define of_match_ptr(_ptr)      (_ptr)
 328
 329 /*
 330  * struct property *prop;
 331  * const __be32 *p;
 332  * u32 u;
 333  *
 334  * of_property_for_each_u32(np, "propname", prop, p, u)
 335  *         printk("U32 value: %x\n", u);
 336  */
 337 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
 338                                u32 *pu);
 339 /*
 340  * struct property *prop;
 341  * const char *s;
 342  *
 343  * of_property_for_each_string(np, "propname", prop, s)
 344  *         printk("String value: %s\n", s);
 345  */
 346 const char *of_prop_next_string(struct property *prop, const char *cur);
 347
 348 int of_device_is_stdout_path(struct device_node *dn);
 349
 350 #else /* CONFIG_OF */
 351
 352 static inline const char* of_node_full_name(struct device_node *np)
 353 {
 354         return "<no-node>";
 355 }
 356
 357 static inline struct device_node *of_find_node_by_name(struct device_node *from,
 358         const char *name)
 359 {
 360         return NULL;
 361 }
 362
 363 static inline struct device_node *of_find_node_by_type(struct device_node *from,
 364         const char *type)
 365 {
 366         return NULL;
 367 }
 368
 369 static inline struct device_node *of_find_matching_node_and_match(
 370         struct device_node *from,
 371         const struct of_device_id *matches,
 372         const struct of_device_id **match)
 373 {
 374         return NULL;
 375 }
 376
 377 static inline struct device_node *of_get_parent(const struct device_node *node)
 378 {
 379         return NULL;
 380 }
 381
 382 static inline struct device_node *of_get_next_child(
 383         const struct device_node *node, struct device_node *prev)
 384 {
 385         return NULL;
 386 }
 387
 388 static inline struct device_node *of_get_next_available_child(
 389         const struct device_node *node, struct device_node *prev)
 390 {
 391         return NULL;
 392 }
 393
 394 static inline struct device_node *of_find_node_with_property(
 395         struct device_node *from, const char *prop_name)
 396 {
 397         return NULL;
 398 }
 399
 400 static inline bool of_have_populated_dt(void)
 401 {
 402         return false;
 403 }
 404
 405 static inline struct device_node *of_get_child_by_name(
 406                                         const struct device_node *node,
 407                                         const char *name)
 408 {
 409         return NULL;
 410 }
 411
 412 static inline int of_device_is_compatible(const struct device_node *device,
 413                                           const char *name)
 414 {
 415         return 0;
 416 }
 417
 418 static inline int of_device_is_available(const struct device_node *device)
 419 {
 420         return 0;
 421 }
 422
 423 static inline struct property *of_find_property(const struct device_node *np,
 424                                                 const char *name,
 425                                                 int *lenp)
 426 {
 427         return NULL;
 428 }
 429
 430 static inline struct device_node *of_find_compatible_node(
 431                                                 struct device_node *from,
 432                                                 const char *type,
 433                                                 const char *compat)
 434 {
 435         return NULL;
 436 }
 437
 438 static inline int of_property_count_elems_of_size(const struct device_node *np,
 439                         const char *propname, int elem_size)
 440 {
 441         return -ENOSYS;
 442 }
 443
 444 static inline int of_property_read_u32_index(const struct device_node *np,
 445                         const char *propname, u32 index, u32 *out_value)
 446 {
 447         return -ENOSYS;
 448 }
 449
 450 static inline int of_property_read_u8_array(const struct device_node *np,
 451                         const char *propname, u8 *out_values, size_t sz)
 452 {
 453         return -ENOSYS;
 454 }
 455
 456 static inline int of_property_read_u16_array(const struct device_node *np,
 457                         const char *propname, u16 *out_values, size_t sz)
 458 {
 459         return -ENOSYS;
 460 }
 461
 462 static inline int of_property_read_u32_array(const struct device_node *np,
 463                                              const char *propname,
 464                                              u32 *out_values, size_t sz)
 465 {
 466         return -ENOSYS;
 467 }
 468
 469 static inline int of_property_read_string(struct device_node *np,
 470                                           const char *propname,
 471                                           const char **out_string)
 472 {
 473         return -ENOSYS;
 474 }
 475
 476 static inline int of_property_read_string_index(struct device_node *np,
 477                                                 const char *propname, int index,
 478                                                 const char **out_string)
 479 {
 480         return -ENOSYS;
 481 }
 482
 483 static inline int of_property_count_strings(struct device_node *np,
 484                                             const char *propname)
 485 {
 486         return -ENOSYS;
 487 }
 488
 489 static inline const void *of_get_property(const struct device_node *node,
 490                                 const char *name,
 491                                 int *lenp)
 492 {
 493         return NULL;
 494 }
 495
 496 static inline struct device_node *of_get_cpu_node(int cpu,
 497                                         unsigned int *thread)
 498 {
 499         return NULL;
 500 }
 501
 502 static inline int of_property_read_u64(const struct device_node *np,
 503                                        const char *propname, u64 *out_value)
 504 {
 505         return -ENOSYS;
 506 }
 507
 508 static inline int of_property_match_string(struct device_node *np,
 509                                            const char *propname,
 510                                            const char *string)
 511 {
 512         return -ENOSYS;
 513 }
 514
 515 static inline struct device_node *of_parse_phandle(const struct device_node *np,
 516                                                    const char *phandle_name,
 517                                                    int index)
 518 {
 519         return NULL;
 520 }
 521
 522 static inline int of_parse_phandle_with_args(struct device_node *np,
 523                                              const char *list_name,
 524                                              const char *cells_name,
 525                                              int index,
 526                                              struct of_phandle_args *out_args)
 527 {
 528         return -ENOSYS;
 529 }
 530
 531 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
 532         const char *list_name, int cells_count, int index,
 533         struct of_phandle_args *out_args)
 534 {
 535         return -ENOSYS;
 536 }
 537
 538 static inline int of_count_phandle_with_args(struct device_node *np,
 539                                              const char *list_name,
 540                                              const char *cells_name)
 541 {
 542         return -ENOSYS;
 543 }
 544
 545 static inline int of_alias_get_id(struct device_node *np, const char *stem)
 546 {
 547         return -ENOSYS;
 548 }
 549
 550 static inline int of_machine_is_compatible(const char *compat)
 551 {
 552         return 0;
 553 }
 554
 555 static inline int of_device_is_stdout_path(struct device_node *dn)
 556 {
 557         return 0;
 558 }
 559
 560 static inline const __be32 *of_prop_next_u32(struct property *prop,
 561                 const __be32 *cur, u32 *pu)
 562 {
 563         return NULL;
 564 }
 565
 566 static inline const char *of_prop_next_string(struct property *prop,
 567                 const char *cur)
 568 {
 569         return NULL;
 570 }
 571
 572 #define of_match_ptr(_ptr)      NULL
 573 #define of_match_node(_matches, _node)  NULL
 574 #endif /* CONFIG_OF */
 575
 576 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
 577 extern int of_node_to_nid(struct device_node *np);
 578 #else
 579 static inline int of_node_to_nid(struct device_node *device) { return 0; }
 580 #endif
 581
 582 static inline struct device_node *of_find_matching_node(
 583         struct device_node *from,
 584         const struct of_device_id *matches)
 585 {
 586         return of_find_matching_node_and_match(from, matches, NULL);
 587 }
 588
 589 /**
 590  * of_property_count_u8_elems - Count the number of u8 elements in a property
 591  *
 592  * @np:         device node from which the property value is to be read.
 593  * @propname:   name of the property to be searched.
 594  *
 595  * Search for a property in a device node and count the number of u8 elements
 596  * in it. Returns number of elements on sucess, -EINVAL if the property does
 597  * not exist or its length does not match a multiple of u8 and -ENODATA if the
 598  * property does not have a value.
 599  */
 600 static inline int of_property_count_u8_elems(const struct device_node *np,
 601                                 const char *propname)
 602 {
 603         return of_property_count_elems_of_size(np, propname, sizeof(u8));
 604 }
 605
 606 /**
 607  * of_property_count_u16_elems - Count the number of u16 elements in a property
 608  *
 609  * @np:         device node from which the property value is to be read.
 610  * @propname:   name of the property to be searched.
 611  *
 612  * Search for a property in a device node and count the number of u16 elements
 613  * in it. Returns number of elements on sucess, -EINVAL if the property does
 614  * not exist or its length does not match a multiple of u16 and -ENODATA if the
 615  * property does not have a value.
 616  */
 617 static inline int of_property_count_u16_elems(const struct device_node *np,
 618                                 const char *propname)
 619 {
 620         return of_property_count_elems_of_size(np, propname, sizeof(u16));
 621 }
 622
 623 /**
 624  * of_property_count_u32_elems - Count the number of u32 elements in a property
 625  *
 626  * @np:         device node from which the property value is to be read.
 627  * @propname:   name of the property to be searched.
 628  *
 629  * Search for a property in a device node and count the number of u32 elements
 630  * in it. Returns number of elements on sucess, -EINVAL if the property does
 631  * not exist or its length does not match a multiple of u32 and -ENODATA if the
 632  * property does not have a value.
 633  */
 634 static inline int of_property_count_u32_elems(const struct device_node *np,
 635                                 const char *propname)
 636 {
 637         return of_property_count_elems_of_size(np, propname, sizeof(u32));
 638 }
 639
 640 /**
 641  * of_property_count_u64_elems - Count the number of u64 elements in a property
 642  *
 643  * @np:         device node from which the property value is to be read.
 644  * @propname:   name of the property to be searched.
 645  *
 646  * Search for a property in a device node and count the number of u64 elements
 647  * in it. Returns number of elements on sucess, -EINVAL if the property does
 648  * not exist or its length does not match a multiple of u64 and -ENODATA if the
 649  * property does not have a value.
 650  */
 651 static inline int of_property_count_u64_elems(const struct device_node *np,
 652                                 const char *propname)
 653 {
 654         return of_property_count_elems_of_size(np, propname, sizeof(u64));
 655 }
 656
 657 /**
 658  * of_property_read_bool - Findfrom a property
 659  * @np:         device node from which the property value is to be read.
 660  * @propname:   name of the property to be searched.
 661  *
 662  * Search for a property in a device node.
 663  * Returns true if the property exist false otherwise.
 664  */
 665 static inline bool of_property_read_bool(const struct device_node *np,
 666                                          const char *propname)
 667 {
 668         struct property *prop = of_find_property(np, propname, NULL);
 669
 670         return prop ? true : false;
 671 }
 672
 673 static inline int of_property_read_u8(const struct device_node *np,
 674                                        const char *propname,
 675                                        u8 *out_value)
 676 {
 677         return of_property_read_u8_array(np, propname, out_value, 1);
 678 }
 679
 680 static inline int of_property_read_u16(const struct device_node *np,
 681                                        const char *propname,
 682                                        u16 *out_value)
 683 {
 684         return of_property_read_u16_array(np, propname, out_value, 1);
 685 }
 686
 687 static inline int of_property_read_u32(const struct device_node *np,
 688                                        const char *propname,
 689                                        u32 *out_value)
 690 {
 691         return of_property_read_u32_array(np, propname, out_value, 1);
 692 }
 693
 694 #define of_property_for_each_u32(np, propname, prop, p, u)      \
 695         for (prop = of_find_property(np, propname, NULL),       \
 696                 p = of_prop_next_u32(prop, NULL, &u);           \
 697                 p;                                              \
 698                 p = of_prop_next_u32(prop, p, &u))
 699
 700 #define of_property_for_each_string(np, propname, prop, s)      \
 701         for (prop = of_find_property(np, propname, NULL),       \
 702                 s = of_prop_next_string(prop, NULL);            \
 703                 s;                                              \
 704                 s = of_prop_next_string(prop, s))
 705
 706 #define for_each_node_by_name(dn, name) \
 707         for (dn = of_find_node_by_name(NULL, name); dn; \
 708              dn = of_find_node_by_name(dn, name))
 709 #define for_each_node_by_type(dn, type) \
 710         for (dn = of_find_node_by_type(NULL, type); dn; \
 711              dn = of_find_node_by_type(dn, type))
 712 #define for_each_compatible_node(dn, type, compatible) \
 713         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 714              dn = of_find_compatible_node(dn, type, compatible))
 715 #define for_each_matching_node(dn, matches) \
 716         for (dn = of_find_matching_node(NULL, matches); dn; \
 717              dn = of_find_matching_node(dn, matches))
 718 #define for_each_matching_node_and_match(dn, matches, match) \
 719         for (dn = of_find_matching_node_and_match(NULL, matches, match); \
 720              dn; dn = of_find_matching_node_and_match(dn, matches, match))
 721
 722 #define for_each_child_of_node(parent, child) \
 723         for (child = of_get_next_child(parent, NULL); child != NULL; \
 724              child = of_get_next_child(parent, child))
 725 #define for_each_available_child_of_node(parent, child) \
 726         for (child = of_get_next_available_child(parent, NULL); child != NULL; \
 727              child = of_get_next_available_child(parent, child))
 728
 729 #define for_each_node_with_property(dn, prop_name) \
 730         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 731              dn = of_find_node_with_property(dn, prop_name))
 732
 733 static inline int of_get_child_count(const struct device_node *np)
 734 {
 735         struct device_node *child;
 736         int num = 0;
 737
 738         for_each_child_of_node(np, child)
 739                 num++;
 740
 741         return num;
 742 }
 743
 744 static inline int of_get_available_child_count(const struct device_node *np)
 745 {
 746         struct device_node *child;
 747         int num = 0;
 748
 749         for_each_available_child_of_node(np, child)
 750                 num++;
 751
 752         return num;
 753 }
 754
 755 #endif /* _LINUX_OF_H */