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