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/kref.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 };
  41
  42 #if defined(CONFIG_SPARC)
  43 struct of_irq_controller;
  44 #endif
  45
  46 struct device_node {
  47         const char *name;
  48         const char *type;
  49         phandle phandle;
  50         const char *full_name;
  51
  52         struct  property *properties;
  53         struct  property *deadprops;    /* removed properties */
  54         struct  device_node *parent;
  55         struct  device_node *child;
  56         struct  device_node *sibling;
  57         struct  device_node *next;      /* next device of same type */
  58         struct  device_node *allnext;   /* next in list of all nodes */
  59         struct  proc_dir_entry *pde;    /* this node's proc directory */
  60         struct  kref kref;
  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 8
  71 struct of_phandle_args {
  72         struct device_node *np;
  73         int args_count;
  74         uint32_t args[MAX_PHANDLE_ARGS];
  75 };
  76
  77 #ifdef CONFIG_OF_DYNAMIC
  78 extern struct device_node *of_node_get(struct device_node *node);
  79 extern void of_node_put(struct device_node *node);
  80 #else /* CONFIG_OF_DYNAMIC */
  81 /* Dummy ref counting routines - to be implemented later */
  82 static inline struct device_node *of_node_get(struct device_node *node)
  83 {
  84         return node;
  85 }
  86 static inline void of_node_put(struct device_node *node) { }
  87 #endif /* !CONFIG_OF_DYNAMIC */
  88
  89 #ifdef CONFIG_OF
  90
  91 /* Pointer for first entry in chain of all nodes. */
  92 extern struct device_node *of_allnodes;
  93 extern struct device_node *of_chosen;
  94 extern struct device_node *of_aliases;
  95 extern raw_spinlock_t devtree_lock;
  96
  97 static inline bool of_have_populated_dt(void)
  98 {
  99         return of_allnodes != NULL;
 100 }
 101
 102 static inline bool of_node_is_root(const struct device_node *node)
 103 {
 104         return node && (node->parent == NULL);
 105 }
 106
 107 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
 108 {
 109         return test_bit(flag, &n->_flags);
 110 }
 111
 112 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
 113 {
 114         set_bit(flag, &n->_flags);
 115 }
 116
 117 extern struct device_node *of_find_all_nodes(struct device_node *prev);
 118
 119 /*
 120  * OF address retrieval & translation
 121  */
 122
 123 /* Helper to read a big number; size is in cells (not bytes) */
 124 static inline u64 of_read_number(const __be32 *cell, int size)
 125 {
 126         u64 r = 0;
 127         while (size--)
 128                 r = (r << 32) | be32_to_cpu(*(cell++));
 129         return r;
 130 }
 131
 132 /* Like of_read_number, but we want an unsigned long result */
 133 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
 134 {
 135         /* toss away upper bits if unsigned long is smaller than u64 */
 136         return of_read_number(cell, size);
 137 }
 138
 139 #if defined(CONFIG_SPARC)
 140 #include <asm/prom.h>
 141 #endif
 142
 143 /* Default #address and #size cells.  Allow arch asm/prom.h to override */
 144 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
 145 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
 146 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
 147 #endif
 148
 149 /* Default string compare functions, Allow arch asm/prom.h to override */
 150 #if !defined(of_compat_cmp)
 151 #define of_compat_cmp(s1, s2, l)        strcasecmp((s1), (s2))
 152 #define of_prop_cmp(s1, s2)             strcmp((s1), (s2))
 153 #define of_node_cmp(s1, s2)             strcasecmp((s1), (s2))
 154 #endif
 155
 156 /* flag descriptions */
 157 #define OF_DYNAMIC      1 /* node and properties were allocated via kmalloc */
 158 #define OF_DETACHED     2 /* node has been detached from the device tree */
 159
 160 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 161 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 162
 163 #define OF_BAD_ADDR     ((u64)-1)
 164
 165 static inline const char *of_node_full_name(const struct device_node *np)
 166 {
 167         return np ? np->full_name : "<no-node>";
 168 }
 169
 170 extern struct device_node *of_find_node_by_name(struct device_node *from,
 171         const char *name);
 172 extern struct device_node *of_find_node_by_type(struct device_node *from,
 173         const char *type);
 174 extern struct device_node *of_find_compatible_node(struct device_node *from,
 175         const char *type, const char *compat);
 176 extern struct device_node *of_find_matching_node_and_match(
 177         struct device_node *from,
 178         const struct of_device_id *matches,
 179         const struct of_device_id **match);
 180
 181 extern struct device_node *of_find_node_by_path(const char *path);
 182 extern struct device_node *of_find_node_by_phandle(phandle handle);
 183 extern struct device_node *of_get_parent(const struct device_node *node);
 184 extern struct device_node *of_get_next_parent(struct device_node *node);
 185 extern struct device_node *of_get_next_child(const struct device_node *node,
 186                                              struct device_node *prev);
 187 extern struct device_node *of_get_next_available_child(
 188         const struct device_node *node, struct device_node *prev);
 189
 190 extern struct device_node *of_get_child_by_name(const struct device_node *node,
 191                                         const char *name);
 192
 193 /* cache lookup */
 194 extern struct device_node *of_find_next_cache_node(const struct device_node *);
 195 extern struct device_node *of_find_node_with_property(
 196         struct device_node *from, const char *prop_name);
 197
 198 extern struct property *of_find_property(const struct device_node *np,
 199                                          const char *name,
 200                                          int *lenp);
 201 extern int of_property_count_elems_of_size(const struct device_node *np,
 202                                 const char *propname, int elem_size);
 203 extern int of_property_read_u32_index(const struct device_node *np,
 204                                        const char *propname,
 205                                        u32 index, u32 *out_value);
 206 extern int of_property_read_u8_array(const struct device_node *np,
 207                         const char *propname, u8 *out_values, size_t sz);
 208 extern int of_property_read_u16_array(const struct device_node *np,
 209                         const char *propname, u16 *out_values, size_t sz);
 210 extern int of_property_read_u32_array(const struct device_node *np,
 211                                       const char *propname,
 212                                       u32 *out_values,
 213                                       size_t sz);
 214 extern int of_property_read_u64(const struct device_node *np,
 215                                 const char *propname, u64 *out_value);
 216
 217 extern int of_property_read_string(struct device_node *np,
 218                                    const char *propname,
 219                                    const char **out_string);
 220 extern int of_property_read_string_index(struct device_node *np,
 221                                          const char *propname,
 222                                          int index, const char **output);
 223 extern int of_property_match_string(struct device_node *np,
 224                                     const char *propname,
 225                                     const char *string);
 226 extern int of_property_count_strings(struct device_node *np,
 227                                      const char *propname);
 228 extern int of_device_is_compatible(const struct device_node *device,
 229                                    const char *);
 230 extern int of_device_is_available(const struct device_node *device);
 231 extern const void *of_get_property(const struct device_node *node,
 232                                 const char *name,
 233                                 int *lenp);
 234 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
 235 #define for_each_property_of_node(dn, pp) \
 236         for (pp = dn->properties; pp != NULL; pp = pp->next)
 237
 238 extern int of_n_addr_cells(struct device_node *np);
 239 extern int of_n_size_cells(struct device_node *np);
 240 extern const struct of_device_id *of_match_node(
 241         const struct of_device_id *matches, const struct device_node *node);
 242 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
 243 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
 244 extern struct device_node *of_parse_phandle(const struct device_node *np,
 245                                             const char *phandle_name,
 246                                             int index);
 247 extern int of_parse_phandle_with_args(const struct device_node *np,
 248         const char *list_name, const char *cells_name, int index,
 249         struct of_phandle_args *out_args);
 250 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
 251         const char *list_name, int cells_count, int index,
 252         struct of_phandle_args *out_args);
 253 extern int of_count_phandle_with_args(const struct device_node *np,
 254         const char *list_name, const char *cells_name);
 255
 256 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
 257 extern int of_alias_get_id(struct device_node *np, const char *stem);
 258
 259 extern int of_machine_is_compatible(const char *compat);
 260
 261 extern int of_add_property(struct device_node *np, struct property *prop);
 262 extern int of_remove_property(struct device_node *np, struct property *prop);
 263 extern int of_update_property(struct device_node *np, struct property *newprop);
 264
 265 /* For updating the device tree at runtime */
 266 #define OF_RECONFIG_ATTACH_NODE         0x0001
 267 #define OF_RECONFIG_DETACH_NODE         0x0002
 268 #define OF_RECONFIG_ADD_PROPERTY        0x0003
 269 #define OF_RECONFIG_REMOVE_PROPERTY     0x0004
 270 #define OF_RECONFIG_UPDATE_PROPERTY     0x0005
 271
 272 struct of_prop_reconfig {
 273         struct device_node      *dn;
 274         struct property         *prop;
 275 };
 276
 277 extern int of_reconfig_notifier_register(struct notifier_block *);
 278 extern int of_reconfig_notifier_unregister(struct notifier_block *);
 279 extern int of_reconfig_notify(unsigned long, void *);
 280
 281 extern int of_attach_node(struct device_node *);
 282 extern int of_detach_node(struct device_node *);
 283
 284 #define of_match_ptr(_ptr)      (_ptr)
 285
 286 /*
 287  * struct property *prop;
 288  * const __be32 *p;
 289  * u32 u;
 290  *
 291  * of_property_for_each_u32(np, "propname", prop, p, u)
 292  *         printk("U32 value: %x\n", u);
 293  */
 294 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
 295                                u32 *pu);
 296 /*
 297  * struct property *prop;
 298  * const char *s;
 299  *
 300  * of_property_for_each_string(np, "propname", prop, s)
 301  *         printk("String value: %s\n", s);
 302  */
 303 const char *of_prop_next_string(struct property *prop, const char *cur);
 304
 305 int of_device_is_stdout_path(struct device_node *dn);
 306
 307 #else /* CONFIG_OF */
 308
 309 static inline const char* of_node_full_name(struct device_node *np)
 310 {
 311         return "<no-node>";
 312 }
 313
 314 static inline struct device_node *of_find_node_by_name(struct device_node *from,
 315         const char *name)
 316 {
 317         return NULL;
 318 }
 319
 320 static inline struct device_node *of_find_node_by_type(struct device_node *from,
 321         const char *type)
 322 {
 323         return NULL;
 324 }
 325
 326 static inline struct device_node *of_find_matching_node_and_match(
 327         struct device_node *from,
 328         const struct of_device_id *matches,
 329         const struct of_device_id **match)
 330 {
 331         return NULL;
 332 }
 333
 334 static inline struct device_node *of_get_parent(const struct device_node *node)
 335 {
 336         return NULL;
 337 }
 338
 339 static inline struct device_node *of_get_next_child(
 340         const struct device_node *node, struct device_node *prev)
 341 {
 342         return NULL;
 343 }
 344
 345 static inline struct device_node *of_get_next_available_child(
 346         const struct device_node *node, struct device_node *prev)
 347 {
 348         return NULL;
 349 }
 350
 351 static inline struct device_node *of_find_node_with_property(
 352         struct device_node *from, const char *prop_name)
 353 {
 354         return NULL;
 355 }
 356
 357 static inline bool of_have_populated_dt(void)
 358 {
 359         return false;
 360 }
 361
 362 static inline struct device_node *of_get_child_by_name(
 363                                         const struct device_node *node,
 364                                         const char *name)
 365 {
 366         return NULL;
 367 }
 368
 369 static inline int of_device_is_compatible(const struct device_node *device,
 370                                           const char *name)
 371 {
 372         return 0;
 373 }
 374
 375 static inline int of_device_is_available(const struct device_node *device)
 376 {
 377         return 0;
 378 }
 379
 380 static inline struct property *of_find_property(const struct device_node *np,
 381                                                 const char *name,
 382                                                 int *lenp)
 383 {
 384         return NULL;
 385 }
 386
 387 static inline struct device_node *of_find_compatible_node(
 388                                                 struct device_node *from,
 389                                                 const char *type,
 390                                                 const char *compat)
 391 {
 392         return NULL;
 393 }
 394
 395 static inline int of_property_count_elems_of_size(const struct device_node *np,
 396                         const char *propname, int elem_size)
 397 {
 398         return -ENOSYS;
 399 }
 400
 401 static inline int of_property_read_u32_index(const struct device_node *np,
 402                         const char *propname, u32 index, u32 *out_value)
 403 {
 404         return -ENOSYS;
 405 }
 406
 407 static inline int of_property_read_u8_array(const struct device_node *np,
 408                         const char *propname, u8 *out_values, size_t sz)
 409 {
 410         return -ENOSYS;
 411 }
 412
 413 static inline int of_property_read_u16_array(const struct device_node *np,
 414                         const char *propname, u16 *out_values, size_t sz)
 415 {
 416         return -ENOSYS;
 417 }
 418
 419 static inline int of_property_read_u32_array(const struct device_node *np,
 420                                              const char *propname,
 421                                              u32 *out_values, size_t sz)
 422 {
 423         return -ENOSYS;
 424 }
 425
 426 static inline int of_property_read_string(struct device_node *np,
 427                                           const char *propname,
 428                                           const char **out_string)
 429 {
 430         return -ENOSYS;
 431 }
 432
 433 static inline int of_property_read_string_index(struct device_node *np,
 434                                                 const char *propname, int index,
 435                                                 const char **out_string)
 436 {
 437         return -ENOSYS;
 438 }
 439
 440 static inline int of_property_count_strings(struct device_node *np,
 441                                             const char *propname)
 442 {
 443         return -ENOSYS;
 444 }
 445
 446 static inline const void *of_get_property(const struct device_node *node,
 447                                 const char *name,
 448                                 int *lenp)
 449 {
 450         return NULL;
 451 }
 452
 453 static inline struct device_node *of_get_cpu_node(int cpu,
 454                                         unsigned int *thread)
 455 {
 456         return NULL;
 457 }
 458
 459 static inline int of_property_read_u64(const struct device_node *np,
 460                                        const char *propname, u64 *out_value)
 461 {
 462         return -ENOSYS;
 463 }
 464
 465 static inline int of_property_match_string(struct device_node *np,
 466                                            const char *propname,
 467                                            const char *string)
 468 {
 469         return -ENOSYS;
 470 }
 471
 472 static inline struct device_node *of_parse_phandle(const struct device_node *np,
 473                                                    const char *phandle_name,
 474                                                    int index)
 475 {
 476         return NULL;
 477 }
 478
 479 static inline int of_parse_phandle_with_args(struct device_node *np,
 480                                              const char *list_name,
 481                                              const char *cells_name,
 482                                              int index,
 483                                              struct of_phandle_args *out_args)
 484 {
 485         return -ENOSYS;
 486 }
 487
 488 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
 489         const char *list_name, int cells_count, int index,
 490         struct of_phandle_args *out_args)
 491 {
 492         return -ENOSYS;
 493 }
 494
 495 static inline int of_count_phandle_with_args(struct device_node *np,
 496                                              const char *list_name,
 497                                              const char *cells_name)
 498 {
 499         return -ENOSYS;
 500 }
 501
 502 static inline int of_alias_get_id(struct device_node *np, const char *stem)
 503 {
 504         return -ENOSYS;
 505 }
 506
 507 static inline int of_machine_is_compatible(const char *compat)
 508 {
 509         return 0;
 510 }
 511
 512 static inline int of_device_is_stdout_path(struct device_node *dn)
 513 {
 514         return 0;
 515 }
 516
 517 static inline const __be32 *of_prop_next_u32(struct property *prop,
 518                 const __be32 *cur, u32 *pu)
 519 {
 520         return NULL;
 521 }
 522
 523 static inline const char *of_prop_next_string(struct property *prop,
 524                 const char *cur)
 525 {
 526         return NULL;
 527 }
 528
 529 #define of_match_ptr(_ptr)      NULL
 530 #define of_match_node(_matches, _node)  NULL
 531 #endif /* CONFIG_OF */
 532
 533 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
 534 extern int of_node_to_nid(struct device_node *np);
 535 #else
 536 static inline int of_node_to_nid(struct device_node *device) { return 0; }
 537 #endif
 538
 539 static inline struct device_node *of_find_matching_node(
 540         struct device_node *from,
 541         const struct of_device_id *matches)
 542 {
 543         return of_find_matching_node_and_match(from, matches, NULL);
 544 }
 545
 546 /**
 547  * of_property_count_u8_elems - Count the number of u8 elements in a property
 548  *
 549  * @np:         device node from which the property value is to be read.
 550  * @propname:   name of the property to be searched.
 551  *
 552  * Search for a property in a device node and count the number of u8 elements
 553  * in it. Returns number of elements on sucess, -EINVAL if the property does
 554  * not exist or its length does not match a multiple of u8 and -ENODATA if the
 555  * property does not have a value.
 556  */
 557 static inline int of_property_count_u8_elems(const struct device_node *np,
 558                                 const char *propname)
 559 {
 560         return of_property_count_elems_of_size(np, propname, sizeof(u8));
 561 }
 562
 563 /**
 564  * of_property_count_u16_elems - Count the number of u16 elements in a property
 565  *
 566  * @np:         device node from which the property value is to be read.
 567  * @propname:   name of the property to be searched.
 568  *
 569  * Search for a property in a device node and count the number of u16 elements
 570  * in it. Returns number of elements on sucess, -EINVAL if the property does
 571  * not exist or its length does not match a multiple of u16 and -ENODATA if the
 572  * property does not have a value.
 573  */
 574 static inline int of_property_count_u16_elems(const struct device_node *np,
 575                                 const char *propname)
 576 {
 577         return of_property_count_elems_of_size(np, propname, sizeof(u16));
 578 }
 579
 580 /**
 581  * of_property_count_u32_elems - Count the number of u32 elements in a property
 582  *
 583  * @np:         device node from which the property value is to be read.
 584  * @propname:   name of the property to be searched.
 585  *
 586  * Search for a property in a device node and count the number of u32 elements
 587  * in it. Returns number of elements on sucess, -EINVAL if the property does
 588  * not exist or its length does not match a multiple of u32 and -ENODATA if the
 589  * property does not have a value.
 590  */
 591 static inline int of_property_count_u32_elems(const struct device_node *np,
 592                                 const char *propname)
 593 {
 594         return of_property_count_elems_of_size(np, propname, sizeof(u32));
 595 }
 596
 597 /**
 598  * of_property_count_u64_elems - Count the number of u64 elements in a property
 599  *
 600  * @np:         device node from which the property value is to be read.
 601  * @propname:   name of the property to be searched.
 602  *
 603  * Search for a property in a device node and count the number of u64 elements
 604  * in it. Returns number of elements on sucess, -EINVAL if the property does
 605  * not exist or its length does not match a multiple of u64 and -ENODATA if the
 606  * property does not have a value.
 607  */
 608 static inline int of_property_count_u64_elems(const struct device_node *np,
 609                                 const char *propname)
 610 {
 611         return of_property_count_elems_of_size(np, propname, sizeof(u64));
 612 }
 613
 614 /**
 615  * of_property_read_bool - Findfrom a property
 616  * @np:         device node from which the property value is to be read.
 617  * @propname:   name of the property to be searched.
 618  *
 619  * Search for a property in a device node.
 620  * Returns true if the property exist false otherwise.
 621  */
 622 static inline bool of_property_read_bool(const struct device_node *np,
 623                                          const char *propname)
 624 {
 625         struct property *prop = of_find_property(np, propname, NULL);
 626
 627         return prop ? true : false;
 628 }
 629
 630 static inline int of_property_read_u8(const struct device_node *np,
 631                                        const char *propname,
 632                                        u8 *out_value)
 633 {
 634         return of_property_read_u8_array(np, propname, out_value, 1);
 635 }
 636
 637 static inline int of_property_read_u16(const struct device_node *np,
 638                                        const char *propname,
 639                                        u16 *out_value)
 640 {
 641         return of_property_read_u16_array(np, propname, out_value, 1);
 642 }
 643
 644 static inline int of_property_read_u32(const struct device_node *np,
 645                                        const char *propname,
 646                                        u32 *out_value)
 647 {
 648         return of_property_read_u32_array(np, propname, out_value, 1);
 649 }
 650
 651 #define of_property_for_each_u32(np, propname, prop, p, u)      \
 652         for (prop = of_find_property(np, propname, NULL),       \
 653                 p = of_prop_next_u32(prop, NULL, &u);           \
 654                 p;                                              \
 655                 p = of_prop_next_u32(prop, p, &u))
 656
 657 #define of_property_for_each_string(np, propname, prop, s)      \
 658         for (prop = of_find_property(np, propname, NULL),       \
 659                 s = of_prop_next_string(prop, NULL);            \
 660                 s;                                              \
 661                 s = of_prop_next_string(prop, s))
 662
 663 #define for_each_node_by_name(dn, name) \
 664         for (dn = of_find_node_by_name(NULL, name); dn; \
 665              dn = of_find_node_by_name(dn, name))
 666 #define for_each_node_by_type(dn, type) \
 667         for (dn = of_find_node_by_type(NULL, type); dn; \
 668              dn = of_find_node_by_type(dn, type))
 669 #define for_each_compatible_node(dn, type, compatible) \
 670         for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
 671              dn = of_find_compatible_node(dn, type, compatible))
 672 #define for_each_matching_node(dn, matches) \
 673         for (dn = of_find_matching_node(NULL, matches); dn; \
 674              dn = of_find_matching_node(dn, matches))
 675 #define for_each_matching_node_and_match(dn, matches, match) \
 676         for (dn = of_find_matching_node_and_match(NULL, matches, match); \
 677              dn; dn = of_find_matching_node_and_match(dn, matches, match))
 678
 679 #define for_each_child_of_node(parent, child) \
 680         for (child = of_get_next_child(parent, NULL); child != NULL; \
 681              child = of_get_next_child(parent, child))
 682 #define for_each_available_child_of_node(parent, child) \
 683         for (child = of_get_next_available_child(parent, NULL); child != NULL; \
 684              child = of_get_next_available_child(parent, child))
 685
 686 #define for_each_node_with_property(dn, prop_name) \
 687         for (dn = of_find_node_with_property(NULL, prop_name); dn; \
 688              dn = of_find_node_with_property(dn, prop_name))
 689
 690 static inline int of_get_child_count(const struct device_node *np)
 691 {
 692         struct device_node *child;
 693         int num = 0;
 694
 695         for_each_child_of_node(np, child)
 696                 num++;
 697
 698         return num;
 699 }
 700
 701 static inline int of_get_available_child_count(const struct device_node *np)
 702 {
 703         struct device_node *child;
 704         int num = 0;
 705
 706         for_each_available_child_of_node(np, child)
 707                 num++;
 708
 709         return num;
 710 }
 711
 712 #if defined(CONFIG_PROC_FS) && defined(CONFIG_PROC_DEVICETREE)
 713 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 714 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
 715 extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
 716                                          struct property *prop);
 717 extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 718                                          struct property *newprop,
 719                                          struct property *oldprop);
 720 #endif
 721
 722 #endif /* _LINUX_OF_H */