#ifndef _COMPAT_LINUX_OF_H
#define _COMPAT_LINUX_OF_H 1

#include <linux/version.h>
#include_next <linux/of.h>

#if LINUX_VERSION_IS_LESS(3,7,0)
#ifdef CONFIG_OF
extern struct device_node *of_get_child_by_name(const struct device_node *node,
						const char *name);
#else
static inline struct device_node *of_get_child_by_name(
					const struct device_node *node,
					const char *name)
{
	return NULL;
}
#endif /* CONFIG_OF */
#endif /* LINUX_VERSION_IS_LESS(3,7,0) */

#if LINUX_VERSION_IS_LESS(3,7,0)
#ifndef CONFIG_OF
static inline struct device_node *of_find_node_by_name(struct device_node *from,
	const char *name)
{
	return NULL;
}
#endif /* CONFIG_OF */
#endif /* LINUX_VERSION_IS_LESS(3,7,0) */

#if LINUX_VERSION_IS_LESS(3,8,0)
#define of_property_read_u8_array LINUX_I915_BACKPORT(of_property_read_u8_array)
#ifdef CONFIG_OF
extern int of_property_read_u8_array(const struct device_node *np,
			const char *propname, u8 *out_values, size_t sz);
#else
static inline int of_property_read_u8_array(const struct device_node *np,
			const char *propname, u8 *out_values, size_t sz)
{
	return -ENOSYS;
}
#endif /* CONFIG_OF */
#endif /* LINUX_VERSION_IS_LESS(3,8,0) */

#if LINUX_VERSION_IS_LESS(3,1,0)
#define of_property_read_u32_array LINUX_I915_BACKPORT(of_property_read_u32_array)
#ifdef CONFIG_OF
extern int of_property_read_u32_array(const struct device_node *np,
				      const char *propname,
				      u32 *out_values,
				      size_t sz);
#else
static inline int of_property_read_u32_array(const struct device_node *np,
					     const char *propname,
					     u32 *out_values, size_t sz)
{
	return -ENOSYS;
}
#endif /* CONFIG_OF */
#define of_property_read_u32 LINUX_I915_BACKPORT(of_property_read_u32)
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);
}
#ifndef CONFIG_OF
#define of_get_property LINUX_I915_BACKPORT(of_get_property)
static inline const void *of_get_property(const struct device_node *node,
				const char *name,
				int *lenp)
{
	return NULL;
}

#endif
#endif /* LINUX_VERSION_IS_LESS(3,1,0) */

#if LINUX_VERSION_IS_LESS(3,10,0)
#define of_property_read_u32_index LINUX_I915_BACKPORT(of_property_read_u32_index)
#ifdef CONFIG_OF
extern int of_property_read_u32_index(const struct device_node *np,
				       const char *propname,
				       u32 index, u32 *out_value);
#else
static inline int of_property_read_u32_index(const struct device_node *np,
			const char *propname, u32 index, u32 *out_value)
{
	return -ENOSYS;
}
#endif /* CONFIG_OF */
#endif /* LINUX_VERSION_IS_LESS(3,10,0) */

#if LINUX_VERSION_IS_LESS(3,15,0)
#define of_property_count_elems_of_size LINUX_I915_BACKPORT(of_property_count_elems_of_size)
#ifdef CONFIG_OF
extern int of_property_count_elems_of_size(const struct device_node *np,
				const char *propname, int elem_size);
#else
static inline int of_property_count_elems_of_size(const struct device_node *np,
			const char *propname, int elem_size)
{
	return -ENOSYS;
}
#endif /* CONFIG_OF */
#endif /* LINUX_VERSION_IS_LESS(3,15,0) */


#if LINUX_VERSION_IS_LESS(3,15,0)
/**
 * 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.
 */
#define of_property_count_u32_elems LINUX_I915_BACKPORT(of_property_count_u32_elems)
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));
}
#endif /* LINUX_VERSION_IS_LESS(3,15,0) */

#if LINUX_VERSION_IS_LESS(3,3,0)
#ifndef CONFIG_OF
#define of_node_get LINUX_I915_BACKPORT(of_node_get)
/* 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 */
#endif /* LINUX_VERSION_IS_LESS(3,3,0) */

#ifndef of_match_ptr
#ifdef CONFIG_OF
#define of_match_ptr(_ptr)	(_ptr)
#else
#define of_match_ptr(_ptr)	NULL
#endif /* CONFIG_OF */
#endif /* of_match_ptr */

#ifndef for_each_compatible_node
#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))
#endif /* for_each_compatible_node */

#if LINUX_VERSION_IS_LESS(3,3,0)
#ifndef CONFIG_OF
static inline struct device_node *of_find_compatible_node(
						struct device_node *from,
						const char *type,
						const char *compat)
{
	return NULL;
}
#endif
#endif

#if LINUX_VERSION_IS_LESS(3,18,0)
#define of_property_read_u64_array LINUX_I915_BACKPORT(of_property_read_u64_array)
#ifdef CONFIG_OF
/* This is static in the kernel, but we need it in multiple places */
void *of_find_property_value_of_size(const struct device_node *np,
				     const char *propname, u32 len);
extern int of_property_read_u64_array(const struct device_node *np,
				      const char *propname,
				      u64 *out_values,
				      size_t sz);
#else
static inline int of_property_read_u64_array(const struct device_node *np,
					     const char *propname,
					     u64 *out_values, size_t sz)
{
	return -ENOSYS;
}
#endif /* CONFIG_OF */
#endif /* LINUX_VERSION_IS_LESS(3,15,0) */

#if LINUX_VERSION_IS_LESS(3,6,0)
#define of_node_full_name LINUX_I915_BACKPORT(of_node_full_name)
#ifdef CONFIG_OF
static inline const char *of_node_full_name(const struct device_node *np)
{
	return np ? np->full_name : "<no-node>";
}
#else
static inline const char* of_node_full_name(const struct device_node *np)
{
	return "<no-node>";
}
#endif /* CONFIG_OF */
#endif /* < 3.6 */

#ifndef for_each_child_of_node
#define for_each_child_of_node(parent, child) \
	while (0)
#endif

#ifndef CONFIG_OF
#if LINUX_VERSION_IS_LESS(3,10,0)
static inline int of_device_is_available(const struct device_node *device)
{
	return 0;
}
#endif

#if LINUX_VERSION_IS_LESS(3,6,0) && !LINUX_VERSION_IN_RANGE(3,2,70, 3,3,0)
static inline int of_property_match_string(struct device_node *np,
					   const char *propname,
					   const char *string)
{
	return -ENOSYS;
}
#endif

#if LINUX_VERSION_IS_LESS(3,2,0)
static inline struct property *of_find_property(const struct device_node *np,
						const char *name, int *lenp)
{
	return NULL;
}

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

static inline struct device_node *of_parse_phandle(struct device_node *np,
						   const char *phandle_name,
						   int index)
{
	return NULL;
}

#define of_match_node(_matches, _node)	NULL
#endif

#endif /* CONFIG_OF */

#if LINUX_VERSION_IS_LESS(3,4,0) && !LINUX_VERSION_IN_RANGE(3,2,44, 3,3,0)
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;
}
#endif

#endif	/* _COMPAT_LINUX_OF_H */
