#ifndef _LINUX_OF_H
  #define _LINUX_OF_H
  /*
   * Definitions for talking to the Open Firmware PROM on
   * Power Macintosh and other computers.
   *
   * Copyright (C) 1996-2005 Paul Mackerras.
   *
   * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
   * Updates for SPARC64 by David S. Miller
   * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  #include <linux/types.h>

  #include <linux/bitops.h>

  #include <linux/errno.h>

  #include <linux/kobject.h>

  #include <linux/mod_devicetable.h>

  #include <linux/spinlock.h>

  #include <linux/topology.h>

  #include <linux/notifier.h>

  #include <linux/property.h>

  #include <linux/list.h>

  #include <asm/byteorder.h>

  #include <asm/errno.h>

  typedef u32 phandle;
  typedef u32 ihandle;
  
  struct property {
  	char	*name;
  	int	length;
  	void	*value;
  	struct property *next;
  	unsigned long _flags;
  	unsigned int unique_id;

  	struct bin_attribute attr;

  };

  #if defined(CONFIG_SPARC)
  struct of_irq_controller;
  #endif
  
  struct device_node {
  	const char *name;
  	const char *type;

  	phandle phandle;

  	const char *full_name;

  	struct fwnode_handle fwnode;

  
  	struct	property *properties;
  	struct	property *deadprops;	/* removed properties */
  	struct	device_node *parent;
  	struct	device_node *child;
  	struct	device_node *sibling;

  	struct	kobject kobj;

  	unsigned long _flags;
  	void	*data;
  #if defined(CONFIG_SPARC)

  	const char *path_component_name;

  	unsigned int unique_id;
  	struct of_irq_controller *irq_trans;
  #endif
  };

  #define MAX_PHANDLE_ARGS 16

  struct of_phandle_args {
  	struct device_node *np;
  	int args_count;
  	uint32_t args[MAX_PHANDLE_ARGS];
  };

  struct of_reconfig_data {
  	struct device_node	*dn;
  	struct property		*prop;
  	struct property		*old_prop;
  };

  /* initialize a node */
  extern struct kobj_type of_node_ktype;
  static inline void of_node_init(struct device_node *node)
  {
  	kobject_init(&node->kobj, &of_node_ktype);

  	node->fwnode.type = FWNODE_OF;

  }
  
  /* true when node is initialized */
  static inline int of_node_is_initialized(struct device_node *node)
  {
  	return node && node->kobj.state_initialized;
  }
  
  /* true when node is attached (i.e. present on sysfs) */
  static inline int of_node_is_attached(struct device_node *node)
  {
  	return node && node->kobj.state_in_sysfs;
  }

  #ifdef CONFIG_OF_DYNAMIC
  extern struct device_node *of_node_get(struct device_node *node);
  extern void of_node_put(struct device_node *node);
  #else /* CONFIG_OF_DYNAMIC */

  /* Dummy ref counting routines - to be implemented later */
  static inline struct device_node *of_node_get(struct device_node *node)
  {
  	return node;
  }

  static inline void of_node_put(struct device_node *node) { }
  #endif /* !CONFIG_OF_DYNAMIC */

  /* Pointer for first entry in chain of all nodes. */

  extern struct device_node *of_root;

  extern struct device_node *of_chosen;

  extern struct device_node *of_aliases;

  extern struct device_node *of_stdout;

  extern raw_spinlock_t devtree_lock;

  /* flag descriptions (need to be visible even when !CONFIG_OF) */
  #define OF_DYNAMIC	1 /* node and properties were allocated via kmalloc */
  #define OF_DETACHED	2 /* node has been detached from the device tree */
  #define OF_POPULATED	3 /* device already created for the node */
  #define OF_POPULATED_BUS	4 /* of_platform_populate recursed to children of this node */

  #define OF_BAD_ADDR	((u64)-1)

  #ifdef CONFIG_OF

  void of_core_init(void);

  static inline bool is_of_node(struct fwnode_handle *fwnode)
  {
  	return fwnode && fwnode->type == FWNODE_OF;
  }

  static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)

  {

  	return is_of_node(fwnode) ?
  		container_of(fwnode, struct device_node, fwnode) : NULL;

  }

  static inline bool of_have_populated_dt(void)
  {

  	return of_root != NULL;

  }

  static inline bool of_node_is_root(const struct device_node *node)
  {
  	return node && (node->parent == NULL);
  }

  static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
  {
  	return test_bit(flag, &n->_flags);
  }

  static inline int of_node_test_and_set_flag(struct device_node *n,
  					    unsigned long flag)
  {
  	return test_and_set_bit(flag, &n->_flags);
  }

  static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
  {
  	set_bit(flag, &n->_flags);
  }

  static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
  {
  	clear_bit(flag, &n->_flags);
  }
  
  static inline int of_property_check_flag(struct property *p, unsigned long flag)
  {
  	return test_bit(flag, &p->_flags);
  }
  
  static inline void of_property_set_flag(struct property *p, unsigned long flag)
  {
  	set_bit(flag, &p->_flags);
  }
  
  static inline void of_property_clear_flag(struct property *p, unsigned long flag)
  {
  	clear_bit(flag, &p->_flags);
  }

  extern struct device_node *__of_find_all_nodes(struct device_node *prev);

  extern struct device_node *of_find_all_nodes(struct device_node *prev);

  /*

   * OF address retrieval & translation

   */
  
  /* Helper to read a big number; size is in cells (not bytes) */

  static inline u64 of_read_number(const __be32 *cell, int size)

  {
  	u64 r = 0;
  	while (size--)

  		r = (r << 32) | be32_to_cpu(*(cell++));

  	return r;
  }
  
  /* Like of_read_number, but we want an unsigned long result */

  static inline unsigned long of_read_ulong(const __be32 *cell, int size)

  {

  	/* toss away upper bits if unsigned long is smaller than u64 */
  	return of_read_number(cell, size);

  }

  #if defined(CONFIG_SPARC)

  #include <asm/prom.h>

  #endif

  /* Default #address and #size cells.  Allow arch asm/prom.h to override */
  #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
  #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
  #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
  #endif
  
  /* Default string compare functions, Allow arch asm/prom.h to override */
  #if !defined(of_compat_cmp)

  #define of_compat_cmp(s1, s2, l)	strcasecmp((s1), (s2))

  #define of_prop_cmp(s1, s2)		strcmp((s1), (s2))
  #define of_node_cmp(s1, s2)		strcasecmp((s1), (s2))
  #endif

  #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
  #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)

  static inline const char *of_node_full_name(const struct device_node *np)

  {
  	return np ? np->full_name : "<no-node>";
  }

  #define for_each_of_allnodes_from(from, dn) \
  	for (dn = __of_find_all_nodes(from); dn; dn = __of_find_all_nodes(dn))
  #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)

  extern struct device_node *of_find_node_by_name(struct device_node *from,
  	const char *name);

  extern struct device_node *of_find_node_by_type(struct device_node *from,
  	const char *type);

  extern struct device_node *of_find_compatible_node(struct device_node *from,
  	const char *type, const char *compat);

  extern struct device_node *of_find_matching_node_and_match(
  	struct device_node *from,
  	const struct of_device_id *matches,
  	const struct of_device_id **match);

  extern struct device_node *of_find_node_opts_by_path(const char *path,
  	const char **opts);
  static inline struct device_node *of_find_node_by_path(const char *path)
  {
  	return of_find_node_opts_by_path(path, NULL);
  }

  extern struct device_node *of_find_node_by_phandle(phandle handle);
  extern struct device_node *of_get_parent(const struct device_node *node);

  extern struct device_node *of_get_next_parent(struct device_node *node);

  extern struct device_node *of_get_next_child(const struct device_node *node,
  					     struct device_node *prev);

  extern struct device_node *of_get_next_available_child(
  	const struct device_node *node, struct device_node *prev);

  extern struct device_node *of_get_child_by_name(const struct device_node *node,
  					const char *name);

  /* cache lookup */
  extern struct device_node *of_find_next_cache_node(const struct device_node *);

  extern struct device_node *of_find_node_with_property(
  	struct device_node *from, const char *prop_name);

  extern struct property *of_find_property(const struct device_node *np,
  					 const char *name,
  					 int *lenp);

  extern int of_property_count_elems_of_size(const struct device_node *np,
  				const char *propname, int elem_size);

  extern int of_property_read_u32_index(const struct device_node *np,
  				       const char *propname,
  				       u32 index, u32 *out_value);

  extern int of_property_read_u8_array(const struct device_node *np,
  			const char *propname, u8 *out_values, size_t sz);
  extern int of_property_read_u16_array(const struct device_node *np,
  			const char *propname, u16 *out_values, size_t sz);

  extern int of_property_read_u32_array(const struct device_node *np,

  				      const char *propname,

  				      u32 *out_values,
  				      size_t sz);

  extern int of_property_read_u64(const struct device_node *np,
  				const char *propname, u64 *out_value);

  extern int of_property_read_u64_array(const struct device_node *np,
  				      const char *propname,
  				      u64 *out_values,
  				      size_t sz);

  extern int of_property_read_string(struct device_node *np,
  				   const char *propname,
  				   const char **out_string);

  extern int of_property_match_string(struct device_node *np,
  				    const char *propname,
  				    const char *string);

  extern int of_property_read_string_helper(struct device_node *np,
  					      const char *propname,
  					      const char **out_strs, size_t sz, int index);

  extern int of_device_is_compatible(const struct device_node *device,
  				   const char *);

  extern bool of_device_is_available(const struct device_node *device);

  extern bool of_device_is_big_endian(const struct device_node *device);

  extern const void *of_get_property(const struct device_node *node,
  				const char *name,
  				int *lenp);

  extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);

  #define for_each_property_of_node(dn, pp) \
  	for (pp = dn->properties; pp != NULL; pp = pp->next)

  extern int of_n_addr_cells(struct device_node *np);
  extern int of_n_size_cells(struct device_node *np);

  extern const struct of_device_id *of_match_node(
  	const struct of_device_id *matches, const struct device_node *node);

  extern int of_modalias_node(struct device_node *node, char *modalias, int len);

  extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);

  extern struct device_node *of_parse_phandle(const struct device_node *np,

  					    const char *phandle_name,
  					    int index);

  extern int of_parse_phandle_with_args(const struct device_node *np,

  	const char *list_name, const char *cells_name, int index,

  	struct of_phandle_args *out_args);

  extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
  	const char *list_name, int cells_count, int index,
  	struct of_phandle_args *out_args);

  extern int of_count_phandle_with_args(const struct device_node *np,
  	const char *list_name, const char *cells_name);

  extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
  extern int of_alias_get_id(struct device_node *np, const char *stem);

  extern int of_alias_get_highest_id(const char *stem);

  extern int of_machine_is_compatible(const char *compat);

  extern int of_add_property(struct device_node *np, struct property *prop);
  extern int of_remove_property(struct device_node *np, struct property *prop);
  extern int of_update_property(struct device_node *np, struct property *newprop);

  /* For updating the device tree at runtime */

  #define OF_RECONFIG_ATTACH_NODE		0x0001
  #define OF_RECONFIG_DETACH_NODE		0x0002
  #define OF_RECONFIG_ADD_PROPERTY	0x0003
  #define OF_RECONFIG_REMOVE_PROPERTY	0x0004
  #define OF_RECONFIG_UPDATE_PROPERTY	0x0005

  extern int of_attach_node(struct device_node *);
  extern int of_detach_node(struct device_node *);

  #define of_match_ptr(_ptr)	(_ptr)

  
  /*
   * struct property *prop;
   * const __be32 *p;
   * u32 u;
   *
   * of_property_for_each_u32(np, "propname", prop, p, u)
   *         printk("U32 value: %x
  ", u);
   */
  const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
  			       u32 *pu);

  /*
   * struct property *prop;
   * const char *s;
   *
   * of_property_for_each_string(np, "propname", prop, s)
   *         printk("String value: %s
  ", s);
   */
  const char *of_prop_next_string(struct property *prop, const char *cur);

  bool of_console_check(struct device_node *dn, char *name, int index);

  #else /* CONFIG_OF */

  static inline void of_core_init(void)
  {
  }

  static inline bool is_of_node(struct fwnode_handle *fwnode)
  {
  	return false;
  }

  static inline struct device_node *to_of_node(struct fwnode_handle *fwnode)

  {
  	return NULL;
  }

  static inline const char* of_node_full_name(const struct device_node *np)

  {
  	return "<no-node>";
  }

  static inline struct device_node *of_find_node_by_name(struct device_node *from,
  	const char *name)
  {
  	return NULL;
  }

  static inline struct device_node *of_find_node_by_type(struct device_node *from,
  	const char *type)

  {
  	return NULL;
  }

  static inline struct device_node *of_find_matching_node_and_match(
  	struct device_node *from,
  	const struct of_device_id *matches,
  	const struct of_device_id **match)

  {

  	return NULL;

  }

  static inline struct device_node *of_find_node_by_path(const char *path)
  {
  	return NULL;
  }

  static inline struct device_node *of_find_node_opts_by_path(const char *path,
  	const char **opts)
  {
  	return NULL;
  }

  static inline struct device_node *of_find_node_by_phandle(phandle handle)
  {
  	return NULL;
  }

  static inline struct device_node *of_get_parent(const struct device_node *node)

  {

  	return NULL;

  }

  static inline struct device_node *of_get_next_child(
  	const struct device_node *node, struct device_node *prev)
  {
  	return NULL;
  }

  static inline struct device_node *of_get_next_available_child(
  	const struct device_node *node, struct device_node *prev)
  {
  	return NULL;
  }

  static inline struct device_node *of_find_node_with_property(
  	struct device_node *from, const char *prop_name)

  {
  	return NULL;
  }

  static inline bool of_have_populated_dt(void)

  {

  	return false;

  }

  static inline struct device_node *of_get_child_by_name(
  					const struct device_node *node,
  					const char *name)

  {

  	return NULL;

  }

  static inline int of_device_is_compatible(const struct device_node *device,
  					  const char *name)
  {
  	return 0;
  }

  static inline bool of_device_is_available(const struct device_node *device)

  {

  	return false;

  }

  static inline bool of_device_is_big_endian(const struct device_node *device)
  {
  	return false;

  }

  static inline struct property *of_find_property(const struct device_node *np,
  						const char *name,
  						int *lenp)
  {
  	return NULL;
  }

  static inline struct device_node *of_find_compatible_node(
  						struct device_node *from,
  						const char *type,
  						const char *compat)
  {
  	return NULL;
  }

  static inline int of_property_count_elems_of_size(const struct device_node *np,
  			const char *propname, int elem_size)
  {
  	return -ENOSYS;
  }

  static inline int of_property_read_u32_index(const struct device_node *np,
  			const char *propname, u32 index, u32 *out_value)
  {
  	return -ENOSYS;
  }

  static inline int of_property_read_u8_array(const struct device_node *np,
  			const char *propname, u8 *out_values, size_t sz)
  {
  	return -ENOSYS;
  }
  
  static inline int of_property_read_u16_array(const struct device_node *np,
  			const char *propname, u16 *out_values, size_t sz)
  {
  	return -ENOSYS;
  }

  static inline int of_property_read_u32_array(const struct device_node *np,

  					     const char *propname,
  					     u32 *out_values, size_t sz)

  {
  	return -ENOSYS;
  }

  static inline int of_property_read_u64_array(const struct device_node *np,
  					     const char *propname,
  					     u64 *out_values, size_t sz)
  {
  	return -ENOSYS;
  }

  static inline int of_property_read_string(struct device_node *np,

  					  const char *propname,
  					  const char **out_string)

  {
  	return -ENOSYS;
  }

  static inline int of_property_read_string_helper(struct device_node *np,
  						 const char *propname,
  						 const char **out_strs, size_t sz, int index)

  {
  	return -ENOSYS;
  }

  static inline const void *of_get_property(const struct device_node *node,
  				const char *name,
  				int *lenp)
  {
  	return NULL;
  }

  static inline struct device_node *of_get_cpu_node(int cpu,
  					unsigned int *thread)
  {
  	return NULL;
  }

  static inline int of_property_read_u64(const struct device_node *np,
  				       const char *propname, u64 *out_value)
  {
  	return -ENOSYS;
  }

  static inline int of_property_match_string(struct device_node *np,
  					   const char *propname,
  					   const char *string)
  {
  	return -ENOSYS;
  }

  static inline struct device_node *of_parse_phandle(const struct device_node *np,

  						   const char *phandle_name,
  						   int index)
  {
  	return NULL;
  }

  static inline int of_parse_phandle_with_args(struct device_node *np,
  					     const char *list_name,
  					     const char *cells_name,
  					     int index,
  					     struct of_phandle_args *out_args)
  {
  	return -ENOSYS;
  }

  static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
  	const char *list_name, int cells_count, int index,
  	struct of_phandle_args *out_args)
  {
  	return -ENOSYS;
  }

  static inline int of_count_phandle_with_args(struct device_node *np,
  					     const char *list_name,
  					     const char *cells_name)
  {
  	return -ENOSYS;
  }

  static inline int of_alias_get_id(struct device_node *np, const char *stem)
  {
  	return -ENOSYS;
  }

  static inline int of_alias_get_highest_id(const char *stem)
  {
  	return -ENOSYS;
  }

  static inline int of_machine_is_compatible(const char *compat)
  {
  	return 0;
  }

  static inline bool of_console_check(const struct device_node *dn, const char *name, int index)

  {

  	return false;

  }

  static inline const __be32 *of_prop_next_u32(struct property *prop,
  		const __be32 *cur, u32 *pu)
  {
  	return NULL;
  }
  
  static inline const char *of_prop_next_string(struct property *prop,
  		const char *cur)
  {
  	return NULL;
  }

  static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
  {
  	return 0;
  }
  
  static inline int of_node_test_and_set_flag(struct device_node *n,
  					    unsigned long flag)
  {
  	return 0;
  }
  
  static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
  {
  }
  
  static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
  {
  }
  
  static inline int of_property_check_flag(struct property *p, unsigned long flag)
  {
  	return 0;
  }
  
  static inline void of_property_set_flag(struct property *p, unsigned long flag)
  {
  }
  
  static inline void of_property_clear_flag(struct property *p, unsigned long flag)
  {
  }

  #define of_match_ptr(_ptr)	NULL

  #define of_match_node(_matches, _node)	NULL

  #endif /* CONFIG_OF */

  #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
  extern int of_node_to_nid(struct device_node *np);
  #else

  static inline int of_node_to_nid(struct device_node *device)
  {
  	return NUMA_NO_NODE;
  }

  #endif

  static inline struct device_node *of_find_matching_node(
  	struct device_node *from,
  	const struct of_device_id *matches)
  {
  	return of_find_matching_node_and_match(from, matches, NULL);
  }

  /**

   * of_property_count_u8_elems - Count the number of u8 elements in a property
   *
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   *
   * Search for a property in a device node and count the number of u8 elements
   * in it. Returns number of elements on sucess, -EINVAL if the property does
   * not exist or its length does not match a multiple of u8 and -ENODATA if the
   * property does not have a value.
   */
  static inline int of_property_count_u8_elems(const struct device_node *np,
  				const char *propname)
  {
  	return of_property_count_elems_of_size(np, propname, sizeof(u8));
  }
  
  /**
   * of_property_count_u16_elems - Count the number of u16 elements in a property
   *
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   *
   * Search for a property in a device node and count the number of u16 elements
   * in it. Returns number of elements on sucess, -EINVAL if the property does
   * not exist or its length does not match a multiple of u16 and -ENODATA if the
   * property does not have a value.
   */
  static inline int of_property_count_u16_elems(const struct device_node *np,
  				const char *propname)
  {
  	return of_property_count_elems_of_size(np, propname, sizeof(u16));
  }
  
  /**
   * of_property_count_u32_elems - Count the number of u32 elements in a property
   *
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   *
   * Search for a property in a device node and count the number of u32 elements
   * in it. Returns number of elements on sucess, -EINVAL if the property does
   * not exist or its length does not match a multiple of u32 and -ENODATA if the
   * property does not have a value.
   */
  static inline int of_property_count_u32_elems(const struct device_node *np,
  				const char *propname)
  {
  	return of_property_count_elems_of_size(np, propname, sizeof(u32));
  }
  
  /**
   * of_property_count_u64_elems - Count the number of u64 elements in a property
   *
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   *
   * Search for a property in a device node and count the number of u64 elements
   * in it. Returns number of elements on sucess, -EINVAL if the property does
   * not exist or its length does not match a multiple of u64 and -ENODATA if the
   * property does not have a value.
   */
  static inline int of_property_count_u64_elems(const struct device_node *np,
  				const char *propname)
  {
  	return of_property_count_elems_of_size(np, propname, sizeof(u64));
  }

  /**

   * of_property_read_string_array() - Read an array of strings from a multiple
   * strings property.
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   * @out_strs:	output array of string pointers.
   * @sz:		number of array elements to read.
   *
   * Search for a property in a device tree node and retrieve a list of
   * terminated string values (pointer to data, not a copy) in that property.
   *
   * If @out_strs is NULL, the number of strings in the property is returned.
   */
  static inline int of_property_read_string_array(struct device_node *np,
  						const char *propname, const char **out_strs,
  						size_t sz)
  {
  	return of_property_read_string_helper(np, propname, out_strs, sz, 0);
  }
  
  /**
   * of_property_count_strings() - Find and return the number of strings from a
   * multiple strings property.
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   *
   * Search for a property in a device tree node and retrieve the number of null
   * terminated string contain in it. Returns the number of strings on
   * success, -EINVAL if the property does not exist, -ENODATA if property
   * does not have a value, and -EILSEQ if the string is not null-terminated
   * within the length of the property data.
   */
  static inline int of_property_count_strings(struct device_node *np,
  					    const char *propname)
  {
  	return of_property_read_string_helper(np, propname, NULL, 0, 0);
  }
  
  /**
   * of_property_read_string_index() - Find and read a string from a multiple
   * strings property.
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   * @index:	index of the string in the list of strings
   * @out_string:	pointer to null terminated return string, modified only if
   *		return value is 0.
   *
   * Search for a property in a device tree node and retrieve a null
   * terminated string value (pointer to data, not a copy) in the list of strings
   * contained in that property.
   * Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
   * property does not have a value, and -EILSEQ if the string is not
   * null-terminated within the length of the property data.
   *
   * The out_string pointer is modified only if a valid string can be decoded.
   */
  static inline int of_property_read_string_index(struct device_node *np,
  						const char *propname,
  						int index, const char **output)
  {
  	int rc = of_property_read_string_helper(np, propname, output, 1, index);
  	return rc < 0 ? rc : 0;
  }
  
  /**

   * of_property_read_bool - Findfrom a property
   * @np:		device node from which the property value is to be read.
   * @propname:	name of the property to be searched.
   *
   * Search for a property in a device node.

   * Returns true if the property exists false otherwise.

   */
  static inline bool of_property_read_bool(const struct device_node *np,
  					 const char *propname)
  {
  	struct property *prop = of_find_property(np, propname, NULL);
  
  	return prop ? true : false;
  }

  static inline int of_property_read_u8(const struct device_node *np,
  				       const char *propname,
  				       u8 *out_value)
  {
  	return of_property_read_u8_array(np, propname, out_value, 1);
  }
  
  static inline int of_property_read_u16(const struct device_node *np,
  				       const char *propname,
  				       u16 *out_value)
  {
  	return of_property_read_u16_array(np, propname, out_value, 1);
  }

  static inline int of_property_read_u32(const struct device_node *np,

  				       const char *propname,

  				       u32 *out_value)
  {
  	return of_property_read_u32_array(np, propname, out_value, 1);
  }

  static inline int of_property_read_s32(const struct device_node *np,
  				       const char *propname,
  				       s32 *out_value)
  {
  	return of_property_read_u32(np, propname, (u32*) out_value);
  }

  #define of_property_for_each_u32(np, propname, prop, p, u)	\
  	for (prop = of_find_property(np, propname, NULL),	\
  		p = of_prop_next_u32(prop, NULL, &u);		\
  		p;						\
  		p = of_prop_next_u32(prop, p, &u))
  
  #define of_property_for_each_string(np, propname, prop, s)	\
  	for (prop = of_find_property(np, propname, NULL),	\
  		s = of_prop_next_string(prop, NULL);		\
  		s;						\
  		s = of_prop_next_string(prop, s))

  #define for_each_node_by_name(dn, name) \
  	for (dn = of_find_node_by_name(NULL, name); dn; \
  	     dn = of_find_node_by_name(dn, name))
  #define for_each_node_by_type(dn, type) \
  	for (dn = of_find_node_by_type(NULL, type); dn; \
  	     dn = of_find_node_by_type(dn, type))
  #define for_each_compatible_node(dn, type, compatible) \
  	for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
  	     dn = of_find_compatible_node(dn, type, compatible))
  #define for_each_matching_node(dn, matches) \
  	for (dn = of_find_matching_node(NULL, matches); dn; \
  	     dn = of_find_matching_node(dn, matches))
  #define for_each_matching_node_and_match(dn, matches, match) \
  	for (dn = of_find_matching_node_and_match(NULL, matches, match); \
  	     dn; dn = of_find_matching_node_and_match(dn, matches, match))
  
  #define for_each_child_of_node(parent, child) \
  	for (child = of_get_next_child(parent, NULL); child != NULL; \
  	     child = of_get_next_child(parent, child))
  #define for_each_available_child_of_node(parent, child) \
  	for (child = of_get_next_available_child(parent, NULL); child != NULL; \
  	     child = of_get_next_available_child(parent, child))
  
  #define for_each_node_with_property(dn, prop_name) \
  	for (dn = of_find_node_with_property(NULL, prop_name); dn; \
  	     dn = of_find_node_with_property(dn, prop_name))
  
  static inline int of_get_child_count(const struct device_node *np)
  {
  	struct device_node *child;
  	int num = 0;
  
  	for_each_child_of_node(np, child)
  		num++;
  
  	return num;
  }
  
  static inline int of_get_available_child_count(const struct device_node *np)
  {
  	struct device_node *child;
  	int num = 0;
  
  	for_each_available_child_of_node(np, child)
  		num++;
  
  	return num;
  }

  #ifdef CONFIG_OF
  #define _OF_DECLARE(table, name, compat, fn, fn_type)			\
  	static const struct of_device_id __of_table_##name		\
  		__used __section(__##table##_of_table)			\
  		 = { .compatible = compat,				\
  		     .data = (fn == (fn_type)NULL) ? fn : fn  }
  #else

  #define _OF_DECLARE(table, name, compat, fn, fn_type)			\

  	static const struct of_device_id __of_table_##name		\
  		__attribute__((unused))					\
  		 = { .compatible = compat,				\
  		     .data = (fn == (fn_type)NULL) ? fn : fn }
  #endif
  
  typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
  typedef void (*of_init_fn_1)(struct device_node *);
  
  #define OF_DECLARE_1(table, name, compat, fn) \
  		_OF_DECLARE(table, name, compat, fn, of_init_fn_1)
  #define OF_DECLARE_2(table, name, compat, fn) \
  		_OF_DECLARE(table, name, compat, fn, of_init_fn_2)

  /**
   * struct of_changeset_entry	- Holds a changeset entry
   *
   * @node:	list_head for the log list
   * @action:	notifier action
   * @np:		pointer to the device node affected
   * @prop:	pointer to the property affected
   * @old_prop:	hold a pointer to the original property
   *
   * Every modification of the device tree during a changeset
   * is held in a list of of_changeset_entry structures.
   * That way we can recover from a partial application, or we can
   * revert the changeset
   */
  struct of_changeset_entry {
  	struct list_head node;
  	unsigned long action;
  	struct device_node *np;
  	struct property *prop;
  	struct property *old_prop;
  };
  
  /**
   * struct of_changeset - changeset tracker structure
   *
   * @entries:	list_head for the changeset entries
   *
   * changesets are a convenient way to apply bulk changes to the
   * live tree. In case of an error, changes are rolled-back.
   * changesets live on after initial application, and if not
   * destroyed after use, they can be reverted in one single call.
   */
  struct of_changeset {
  	struct list_head entries;
  };

  enum of_reconfig_change {
  	OF_RECONFIG_NO_CHANGE = 0,
  	OF_RECONFIG_CHANGE_ADD,
  	OF_RECONFIG_CHANGE_REMOVE,
  };

  #ifdef CONFIG_OF_DYNAMIC

  extern int of_reconfig_notifier_register(struct notifier_block *);
  extern int of_reconfig_notifier_unregister(struct notifier_block *);

  extern int of_reconfig_notify(unsigned long, struct of_reconfig_data *rd);
  extern int of_reconfig_get_state_change(unsigned long action,
  					struct of_reconfig_data *arg);

  extern void of_changeset_init(struct of_changeset *ocs);
  extern void of_changeset_destroy(struct of_changeset *ocs);
  extern int of_changeset_apply(struct of_changeset *ocs);
  extern int of_changeset_revert(struct of_changeset *ocs);
  extern int of_changeset_action(struct of_changeset *ocs,
  		unsigned long action, struct device_node *np,
  		struct property *prop);
  
  static inline int of_changeset_attach_node(struct of_changeset *ocs,
  		struct device_node *np)
  {
  	return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
  }
  
  static inline int of_changeset_detach_node(struct of_changeset *ocs,
  		struct device_node *np)
  {
  	return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
  }
  
  static inline int of_changeset_add_property(struct of_changeset *ocs,
  		struct device_node *np, struct property *prop)
  {
  	return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
  }
  
  static inline int of_changeset_remove_property(struct of_changeset *ocs,
  		struct device_node *np, struct property *prop)
  {
  	return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
  }
  
  static inline int of_changeset_update_property(struct of_changeset *ocs,
  		struct device_node *np, struct property *prop)
  {
  	return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
  }

  #else /* CONFIG_OF_DYNAMIC */
  static inline int of_reconfig_notifier_register(struct notifier_block *nb)
  {
  	return -EINVAL;
  }
  static inline int of_reconfig_notifier_unregister(struct notifier_block *nb)
  {
  	return -EINVAL;
  }

  static inline int of_reconfig_notify(unsigned long action,
  				     struct of_reconfig_data *arg)

  {
  	return -EINVAL;
  }

  static inline int of_reconfig_get_state_change(unsigned long action,
  						struct of_reconfig_data *arg)

  {
  	return -EINVAL;
  }
  #endif /* CONFIG_OF_DYNAMIC */

  /* CONFIG_OF_RESOLVE api */
  extern int of_resolve_phandles(struct device_node *tree);

  /**

   * of_device_is_system_power_controller - Tells if system-power-controller is found for device_node

   * @np: Pointer to the given device_node
   *
   * return true if present false otherwise
   */

  static inline bool of_device_is_system_power_controller(const struct device_node *np)

  {

  	return of_property_read_bool(np, "system-power-controller");

  }

  /**

   * Overlay support
   */
  
  #ifdef CONFIG_OF_OVERLAY
  
  /* ID based overlays; the API for external users */
  int of_overlay_create(struct device_node *tree);
  int of_overlay_destroy(int id);
  int of_overlay_destroy_all(void);
  
  #else
  
  static inline int of_overlay_create(struct device_node *tree)
  {
  	return -ENOTSUPP;
  }
  
  static inline int of_overlay_destroy(int id)
  {
  	return -ENOTSUPP;
  }
  
  static inline int of_overlay_destroy_all(void)
  {
  	return -ENOTSUPP;
  }
  
  #endif

  #endif /* _LINUX_OF_H */