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 /* SPDX-License-Identifier: GPL-2.0+ */
 #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.
  */
 #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;
 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
     unsigned long _flags;
 #endif
 #if defined(CONFIG_OF_PROMTREE)
     unsigned int unique_id;
 #endif
 #if defined(CONFIG_OF_KOBJ)
     struct bin_attribute attr;
 #endif
 };
 
 #if defined(CONFIG_SPARC)
 struct of_irq_controller;
 #endif
 
 struct device_node {
     const char *name;
     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;
 #if defined(CONFIG_OF_KOBJ)
     struct  kobject kobj;
 #endif
     unsigned long _flags;
     void    *data;
 #if defined(CONFIG_SPARC)
     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_phandle_iterator {
     /* Common iterator information */
     const char *cells_name;
     int cell_count;
     const struct device_node *parent;
 
     /* List size information */
     const __be32 *list_end;
     const __be32 *phandle_end;
 
     /* Current position state */
     const __be32 *cur;
     uint32_t cur_count;
     phandle phandle;
     struct device_node *node;
 };
 
 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;
 extern const struct fwnode_operations of_fwnode_ops;
 static inline void of_node_init(struct device_node *node)
 {
 #if defined(CONFIG_OF_KOBJ)
     kobject_init(&node->kobj, &of_node_ktype);
 #endif
     fwnode_init(&node->fwnode, &of_fwnode_ops);
 }
 
 #if defined(CONFIG_OF_KOBJ)
 #define of_node_kobj(n) (&(n)->kobj)
 #else
 #define of_node_kobj(n) NULL
 #endif
 
 #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;
 
 /*
  * struct device_node flag descriptions
  * (need to be visible even when !CONFIG_OF)
  */
 #define OF_DYNAMIC      1 /* (and properties) allocated via kmalloc */
 #define OF_DETACHED     2 /* detached from the device tree */
 #define OF_POPULATED        3 /* device already created */
 #define OF_POPULATED_BUS    4 /* platform bus created for children */
 #define OF_OVERLAY      5 /* allocated for an overlay */
 #define OF_OVERLAY_FREE_CSET    6 /* in overlay cset being freed */
 
 #define OF_BAD_ADDR ((u64)-1)
 
 #ifdef CONFIG_OF
 void of_core_init(void);
 
 static inline bool is_of_node(const struct fwnode_handle *fwnode)
 {
     return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &of_fwnode_ops;
 }
 
 #define to_of_node(__fwnode)                        \
     ({                              \
         typeof(__fwnode) __to_of_node_fwnode = (__fwnode);  \
                                     \
         is_of_node(__to_of_node_fwnode) ?           \
             container_of(__to_of_node_fwnode,       \
                      struct device_node, fwnode) :  \
             NULL;                       \
     })
 
 #define of_fwnode_handle(node)                      \
     ({                              \
         typeof(node) __of_fwnode_handle_node = (node);      \
                                     \
         __of_fwnode_handle_node ?               \
             &__of_fwnode_handle_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(const 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);
 }
 
 #if defined(CONFIG_OF_DYNAMIC) || defined(CONFIG_SPARC)
 static inline int of_property_check_flag(const 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);
 }
 #endif
 
 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;
     for (; size--; cell++)
         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
 
 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
 
 extern bool of_node_name_eq(const struct device_node *np, const char *name);
 extern bool of_node_name_prefix(const struct device_node *np, const char *prefix);
 
 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_compatible_child(const struct device_node *parent,
                     const char *compatible);
 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 int of_find_last_cache_level(unsigned int cpu);
 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_u64_index(const struct device_node *np,
                        const char *propname,
                        u32 index, u64 *out_value);
 extern int of_property_read_variable_u8_array(const struct device_node *np,
                     const char *propname, u8 *out_values,
                     size_t sz_min, size_t sz_max);
 extern int of_property_read_variable_u16_array(const struct device_node *np,
                     const char *propname, u16 *out_values,
                     size_t sz_min, size_t sz_max);
 extern int of_property_read_variable_u32_array(const struct device_node *np,
                     const char *propname,
                     u32 *out_values,
                     size_t sz_min,
                     size_t sz_max);
 extern int of_property_read_u64(const struct device_node *np,
                 const char *propname, u64 *out_value);
 extern int of_property_read_variable_u64_array(const struct device_node *np,
                     const char *propname,
                     u64 *out_values,
                     size_t sz_min,
                     size_t sz_max);
 
 extern int of_property_read_string(const struct device_node *np,
                    const char *propname,
                    const char **out_string);
 extern int of_property_match_string(const struct device_node *np,
                     const char *propname,
                     const char *string);
 extern int of_property_read_string_helper(const 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 int of_device_compatible_match(struct device_node *device,
                       const char *const *compat);
 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);
 extern struct device_node *of_get_next_cpu_node(struct device_node *prev);
 extern struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
                          int index);
 extern u64 of_get_cpu_hwid(struct device_node *cpun, 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 int __of_parse_phandle_with_args(const struct device_node *np,
     const char *list_name, const char *cells_name, int cell_count,
     int index, struct of_phandle_args *out_args);
 extern int of_parse_phandle_with_args_map(const struct device_node *np,
     const char *list_name, const char *stem_name, 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);
 
 /* phandle iterator functions */
 extern int of_phandle_iterator_init(struct of_phandle_iterator *it,
                     const struct device_node *np,
                     const char *list_name,
                     const char *cells_name,
                     int cell_count);
 
 extern int of_phandle_iterator_next(struct of_phandle_iterator *it);
 extern int of_phandle_iterator_args(struct of_phandle_iterator *it,
                     uint32_t *args,
                     int size);
 
 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\n", 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\n", 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);
 
 extern int of_cpu_node_to_id(struct device_node *np);
 
 int of_map_id(struct device_node *np, u32 id,
            const char *map_name, const char *map_mask_name,
            struct device_node **target, u32 *id_out);
 
 phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
 
 struct kimage;
 void *of_kexec_alloc_and_setup_fdt(const struct kimage *image,
                    unsigned long initrd_load_addr,
                    unsigned long initrd_len,
                    const char *cmdline, size_t extra_fdt_size);
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
 {
 }
 
 static inline bool is_of_node(const struct fwnode_handle *fwnode)
 {
     return false;
 }
 
 static inline struct device_node *to_of_node(const struct fwnode_handle *fwnode)
 {
     return NULL;
 }
 
 static inline bool of_node_name_eq(const struct device_node *np, const char *name)
 {
     return false;
 }
 
 static inline bool of_node_name_prefix(const struct device_node *np, const char *prefix)
 {
     return false;
 }
 
 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_parent(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;
 }
 
 #define of_fwnode_handle(node) NULL
 
 static inline bool of_have_populated_dt(void)
 {
     return false;
 }
 
 static inline struct device_node *of_get_compatible_child(const struct device_node *parent,
                     const char *compatible)
 {
     return NULL;
 }
 
 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  int of_device_compatible_match(struct device_node *device,
                           const char *const *compat)
 {
     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_u64_index(const struct device_node *np,
             const char *propname, u32 index, u64 *out_value)
 {
     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 struct device_node *of_get_next_cpu_node(struct device_node *prev)
 {
     return NULL;
 }
 
 static inline struct device_node *of_get_cpu_state_node(struct device_node *cpu_node,
                     int index)
 {
     return NULL;
 }
 
 static inline int of_n_addr_cells(struct device_node *np)
 {
     return 0;
 
 }
 static inline int of_n_size_cells(struct device_node *np)
 {
     return 0;
 }
 
 static inline int of_property_read_variable_u8_array(const struct device_node *np,
                     const char *propname, u8 *out_values,
                     size_t sz_min, size_t sz_max)
 {
     return -ENOSYS;
 }
 
 static inline int of_property_read_variable_u16_array(const struct device_node *np,
                     const char *propname, u16 *out_values,
                     size_t sz_min, size_t sz_max)
 {
     return -ENOSYS;
 }
 
 static inline int of_property_read_variable_u32_array(const struct device_node *np,
                     const char *propname,
                     u32 *out_values,
                     size_t sz_min,
                     size_t sz_max)
 {
     return -ENOSYS;
 }
 
 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_read_variable_u64_array(const struct device_node *np,
                     const char *propname,
                     u64 *out_values,
                     size_t sz_min,
                     size_t sz_max)
 {
     return -ENOSYS;
 }
 
 static inline int of_property_read_string(const struct device_node *np,
                       const char *propname,
                       const char **out_string)
 {
     return -ENOSYS;
 }
 
 static inline int of_property_match_string(const struct device_node *np,
                        const char *propname,
                        const char *string)
 {
     return -ENOSYS;
 }
 
 static inline int of_property_read_string_helper(const struct device_node *np,
                          const char *propname,
                          const char **out_strs, size_t sz, int index)
 {
     return -ENOSYS;
 }
 
 static inline int __of_parse_phandle_with_args(const struct device_node *np,
                            const char *list_name,
                            const char *cells_name,
                            int cell_count,
                            int index,
                            struct of_phandle_args *out_args)
 {
     return -ENOSYS;
 }
 
 static inline int of_parse_phandle_with_args_map(const struct device_node *np,
                          const char *list_name,
                          const char *stem_name,
                          int index,
                          struct of_phandle_args *out_args)
 {
     return -ENOSYS;
 }
 
 static inline int of_count_phandle_with_args(const struct device_node *np,
                          const char *list_name,
                          const char *cells_name)
 {
     return -ENOSYS;
 }
 
 static inline int of_phandle_iterator_init(struct of_phandle_iterator *it,
                        const struct device_node *np,
                        const char *list_name,
                        const char *cells_name,
                        int cell_count)
 {
     return -ENOSYS;
 }
 
 static inline int of_phandle_iterator_next(struct of_phandle_iterator *it)
 {
     return -ENOSYS;
 }
 
 static inline int of_phandle_iterator_args(struct of_phandle_iterator *it,
                        uint32_t *args,
                        int size)
 {
     return 0;
 }
 
 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 int of_add_property(struct device_node *np, struct property *prop)
 {
     return 0;
 }
 
 static inline int of_remove_property(struct device_node *np, struct property *prop)
 {
     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(const 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)
 {
 }
 
 static inline int of_cpu_node_to_id(struct device_node *np)
 {
     return -ENODEV;
 }
 
 static inline int of_map_id(struct device_node *np, u32 id,
                  const char *map_name, const char *map_mask_name,
                  struct device_node **target, u32 *id_out)
 {
     return -EINVAL;
 }
 
 static inline phys_addr_t of_dma_get_max_cpu_address(struct device_node *np)
 {
     return PHYS_ADDR_MAX;
 }
 
 #define of_match_ptr(_ptr)  NULL
 #define of_match_node(_matches, _node)  NULL
 #endif /* CONFIG_OF */
 
 /* 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
 
 static inline int of_prop_val_eq(struct property *p1, struct property *p2)
 {
     return p1->length == p2->length &&
            !memcmp(p1->value, p2->value, (size_t)p1->length);
 }
 
 #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
 
 #ifdef CONFIG_OF_NUMA
 extern int of_numa_init(void);
 #else
 static inline int of_numa_init(void)
 {
     return -ENOSYS;
 }
 #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);
 }
 
 static inline const char *of_node_get_device_type(const struct device_node *np)
 {
     return of_get_property(np, "device_type", NULL);
 }
 
 static inline bool of_node_is_type(const struct device_node *np, const char *type)
 {
     const char *match = of_node_get_device_type(np);
 
     return np && match && type && !strcmp(match, type);
 }
 
 /**
  * of_parse_phandle - Resolve a phandle property to a device_node pointer
  * @np: Pointer to device node holding phandle property
  * @phandle_name: Name of property holding a phandle value
  * @index: For properties holding a table of phandles, this is the index into
  *         the table
  *
  * Return: The device_node pointer with refcount incremented.  Use
  * of_node_put() on it when done.
  */
 static inline struct device_node *of_parse_phandle(const struct device_node *np,
                            const char *phandle_name,
                            int index)
 {
     struct of_phandle_args args;
 
     if (__of_parse_phandle_with_args(np, phandle_name, NULL, 0,
                      index, &args))
         return NULL;
 
     return args.np;
 }
 
 /**
  * of_parse_phandle_with_args() - Find a node pointed by phandle in a list
  * @np:     pointer to a device tree node containing a list
  * @list_name:  property name that contains a list
  * @cells_name: property name that specifies phandles' arguments count
  * @index:  index of a phandle to parse out
  * @out_args:   optional pointer to output arguments structure (will be filled)
  *
  * This function is useful to parse lists of phandles and their arguments.
  * Returns 0 on success and fills out_args, on error returns appropriate
  * errno value.
  *
  * Caller is responsible to call of_node_put() on the returned out_args->np
  * pointer.
  *
  * Example::
  *
  *  phandle1: node1 {
  *  #list-cells = <2>;
  *  };
  *
  *  phandle2: node2 {
  *  #list-cells = <1>;
  *  };
  *
  *  node3 {
  *  list = <&phandle1 1 2 &phandle2 3>;
  *  };
  *
  * To get a device_node of the ``node2`` node you may call this:
  * of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
  */
 static inline 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)
 {
     int cell_count = -1;
 
     /* If cells_name is NULL we assume a cell count of 0 */
     if (!cells_name)
         cell_count = 0;
 
     return __of_parse_phandle_with_args(np, list_name, cells_name,
                         cell_count, index, out_args);
 }
 
 /**
  * of_parse_phandle_with_fixed_args() - Find a node pointed by phandle in a list
  * @np:     pointer to a device tree node containing a list
  * @list_name:  property name that contains a list
  * @cell_count: number of argument cells following the phandle
  * @index:  index of a phandle to parse out
  * @out_args:   optional pointer to output arguments structure (will be filled)
  *
  * This function is useful to parse lists of phandles and their arguments.
  * Returns 0 on success and fills out_args, on error returns appropriate
  * errno value.
  *
  * Caller is responsible to call of_node_put() on the returned out_args->np
  * pointer.
  *
  * Example::
  *
  *  phandle1: node1 {
  *  };
  *
  *  phandle2: node2 {
  *  };
  *
  *  node3 {
  *  list = <&phandle1 0 2 &phandle2 2 3>;
  *  };
  *
  * To get a device_node of the ``node2`` node you may call this:
  * of_parse_phandle_with_fixed_args(node3, "list", 2, 1, &args);
  */
 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
                            const char *list_name,
                            int cell_count,
                            int index,
                            struct of_phandle_args *out_args)
 {
     return __of_parse_phandle_with_args(np, list_name, NULL, cell_count,
                         index, out_args);
 }
 
 /**
  * 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.
  *
  * Return: The 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.
  *
  * Return: The 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.
  *
  * Return: The 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.
  *
  * Return: The 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.
  *
  * Return: If @out_strs is NULL, the number of strings in the property is returned.
  */
 static inline int of_property_read_string_array(const 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.
  *
  * Return: 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(const 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
  * @output: 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.
  *
  * Return: 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(const 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 - Find 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.
  *
  * Return: 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;
 }
 
 /**
  * of_property_read_u8_array - Find and read an array of u8 from a property.
  *
  * @np:     device node from which the property value is to be read.
  * @propname:   name of the property to be searched.
  * @out_values: pointer to return value, modified only if return value is 0.
  * @sz:     number of array elements to read
  *
  * Search for a property in a device node and read 8-bit value(s) from
  * it.
  *
  * dts entry of array should be like:
  *  ``property = /bits/ 8 <0x50 0x60 0x70>;``
  *
  * Return: 0 on success, -EINVAL if the property does not exist,
  * -ENODATA if property does not have a value, and -EOVERFLOW if the
  * property data isn't large enough.
  *
  * The out_values is modified only if a valid u8 value can be decoded.
  */
 static inline int of_property_read_u8_array(const struct device_node *np,
                         const char *propname,
                         u8 *out_values, size_t sz)
 {
     int ret = of_property_read_variable_u8_array(np, propname, out_values,
                              sz, 0);
     if (ret >= 0)
         return 0;
     else
         return ret;
 }
 
 /**
  * of_property_read_u16_array - Find and read an array of u16 from a property.
  *
  * @np:     device node from which the property value is to be read.
  * @propname:   name of the property to be searched.
  * @out_values: pointer to return value, modified only if return value is 0.
  * @sz:     number of array elements to read
  *
  * Search for a property in a device node and read 16-bit value(s) from
  * it.
  *
  * dts entry of array should be like:
  *  ``property = /bits/ 16 <0x5000 0x6000 0x7000>;``
  *
  * Return: 0 on success, -EINVAL if the property does not exist,
  * -ENODATA if property does not have a value, and -EOVERFLOW if the
  * property data isn't large enough.
  *
  * The out_values is modified only if a valid u16 value can be decoded.
  */
 static inline int of_property_read_u16_array(const struct device_node *np,
                          const char *propname,
                          u16 *out_values, size_t sz)
 {
     int ret = of_property_read_variable_u16_array(np, propname, out_values,
                               sz, 0);
     if (ret >= 0)
         return 0;
     else
         return ret;
 }
 
 /**
  * of_property_read_u32_array - Find and read an array of 32 bit integers
  * from a property.
  *
  * @np:     device node from which the property value is to be read.
  * @propname:   name of the property to be searched.
  * @out_values: pointer to return value, modified only if return value is 0.
  * @sz:     number of array elements to read
  *
  * Search for a property in a device node and read 32-bit value(s) from
  * it.
  *
  * Return: 0 on success, -EINVAL if the property does not exist,
  * -ENODATA if property does not have a value, and -EOVERFLOW if the
  * property data isn't large enough.
  *
  * The out_values is modified only if a valid u32 value can be decoded.
  */
 static inline int of_property_read_u32_array(const struct device_node *np,
                          const char *propname,
                          u32 *out_values, size_t sz)
 {
     int ret = of_property_read_variable_u32_array(np, propname, out_values,
                               sz, 0);
     if (ret >= 0)
         return 0;
     else
         return ret;
 }
 
 /**
  * of_property_read_u64_array - Find and read an array of 64 bit integers
  * from a property.
  *
  * @np:     device node from which the property value is to be read.
  * @propname:   name of the property to be searched.
  * @out_values: pointer to return value, modified only if return value is 0.
  * @sz:     number of array elements to read
  *
  * Search for a property in a device node and read 64-bit value(s) from
  * it.
  *
  * Return: 0 on success, -EINVAL if the property does not exist,
  * -ENODATA if property does not have a value, and -EOVERFLOW if the
  * property data isn't large enough.
  *
  * The out_values is modified only if a valid u64 value can be decoded.
  */
 static inline int of_property_read_u64_array(const struct device_node *np,
                          const char *propname,
                          u64 *out_values, size_t sz)
 {
     int ret = of_property_read_variable_u64_array(np, propname, out_values,
                               sz, 0);
     if (ret >= 0)
         return 0;
     else
         return ret;
 }
 
 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_for_each_phandle(it, err, np, ln, cn, cc)            \
     for (of_phandle_iterator_init((it), (np), (ln), (cn), (cc)),    \
          err = of_phandle_iterator_next(it);            \
          err == 0;                          \
          err = of_phandle_iterator_next(it))
 
 #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_of_cpu_node(cpu) \
     for (cpu = of_get_next_cpu_node(NULL); cpu != NULL; \
          cpu = of_get_next_cpu_node(cpu))
 
 #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;
 }
 
 #define _OF_DECLARE_STUB(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 }
 
 #if defined(CONFIG_OF) && !defined(MODULE)
 #define _OF_DECLARE(table, name, compat, fn, fn_type)           \
     static const struct of_device_id __of_table_##name      \
         __used __section("__" #table "_of_table")       \
         __aligned(__alignof__(struct of_device_id))     \
          = { .compatible = compat,              \
              .data = (fn == (fn_type)NULL) ? fn : fn  }
 #else
 #define _OF_DECLARE(table, name, compat, fn, fn_type)           \
     _OF_DECLARE_STUB(table, name, compat, fn, fn_type)
 #endif
 
 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
 typedef int (*of_init_fn_1_ret)(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_1_RET(table, name, compat, fn) \
         _OF_DECLARE(table, name, compat, fn, of_init_fn_1_ret)
 #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 */
 
 /**
  * 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
  */
 
 enum of_overlay_notify_action {
     OF_OVERLAY_INIT = 0,    /* kzalloc() of ovcs sets this value */
     OF_OVERLAY_PRE_APPLY,
     OF_OVERLAY_POST_APPLY,
     OF_OVERLAY_PRE_REMOVE,
     OF_OVERLAY_POST_REMOVE,
 };
 
 static inline char *of_overlay_action_name(enum of_overlay_notify_action action)
 {
     static char *of_overlay_action_name[] = {
         "init",
         "pre-apply",
         "post-apply",
         "pre-remove",
         "post-remove",
     };
 
     return of_overlay_action_name[action];
 }
 
 struct of_overlay_notify_data {
     struct device_node *overlay;
     struct device_node *target;
 };
 
 #ifdef CONFIG_OF_OVERLAY
 
 int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
              int *ovcs_id);
 int of_overlay_remove(int *ovcs_id);
 int of_overlay_remove_all(void);
 
 int of_overlay_notifier_register(struct notifier_block *nb);
 int of_overlay_notifier_unregister(struct notifier_block *nb);
 
 #else
 
 static inline int of_overlay_fdt_apply(void *overlay_fdt, u32 overlay_fdt_size,
                        int *ovcs_id)
 {
     return -ENOTSUPP;
 }
 
 static inline int of_overlay_remove(int *ovcs_id)
 {
     return -ENOTSUPP;
 }
 
 static inline int of_overlay_remove_all(void)
 {
     return -ENOTSUPP;
 }
 
 static inline int of_overlay_notifier_register(struct notifier_block *nb)
 {
     return 0;
 }
 
 static inline int of_overlay_notifier_unregister(struct notifier_block *nb)
 {
     return 0;
 }
 
 #endif
 
 #endif /* _LINUX_OF_H */

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