u-boot/include/dm/ofnode.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2017 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef _DM_OFNODE_H
#define _DM_OFNODE_H
/* TODO(sjg@chromium.org): Drop fdtdec.h include */
#include <fdtdec.h>
#include <dm/of.h>
#include <dm/of_access.h>
#include <log.h>
/* Enable checks to protect against invalid calls */
#undef OF_CHECKS
struct resource;
/**
* typedef union ofnode_union ofnode - reference to a device tree node
*
* This union can hold either a straightforward pointer to a struct device_node
* in the live device tree, or an offset within the flat device tree. In the
* latter case, the pointer value is just the integer offset within the flat DT.
*
* Thus we can reference nodes in both the live tree (once available) and the
* flat tree (until then). Functions are available to translate between an
* ofnode and either an offset or a `struct device_node *`.
*
* The reference can also hold a null offset, in which case the pointer value
* here is NULL. This corresponds to a struct device_node * value of
* NULL, or an offset of -1.
*
* There is no ambiguity as to whether ofnode holds an offset or a node
* pointer: when the live tree is active it holds a node pointer, otherwise it
* holds an offset. The value itself does not need to be unique and in theory
* the same value could point to a valid device node or a valid offset. We
* could arrange for a unique value to be used (e.g. by making the pointer
* point to an offset within the flat device tree in the case of an offset) but
* this increases code size slightly due to the subtraction. Since it offers no
* real benefit, the approach described here seems best.
*
* For now these points use constant types, since we don't allow writing
* the DT.
*
* @np: Pointer to device node, used for live tree
* @of_offset: Pointer into flat device tree, used for flat tree. Note that this
* is not a really a pointer to a node: it is an offset value. See above.
*/
typedef union ofnode_union {
const struct device_node *np;
long of_offset;
} ofnode;
struct ofnode_phandle_args {
ofnode node;
int args_count;
uint32_t args[OF_MAX_PHANDLE_ARGS];
};
/**
* struct ofprop - reference to a property of a device tree node
*
* This struct hold the reference on one property of one node,
* using struct ofnode and an offset within the flat device tree or either
* a pointer to a struct property in the live device tree.
*
* Thus we can reference arguments in both the live tree and the flat tree.
*
* The property reference can also hold a null reference. This corresponds to
* a struct property NULL pointer or an offset of -1.
*
* @node: Pointer to device node
* @offset: Pointer into flat device tree, used for flat tree.
* @prop: Pointer to property, used for live treee.
*/
struct ofprop {
ofnode node;
union {
int offset;
const struct property *prop;
};
};
/**
* ofnode_to_np() - convert an ofnode to a live DT node pointer
*
* This cannot be called if the reference contains an offset.
*
* @node: Reference containing struct device_node * (possibly invalid)
* Return: pointer to device node (can be NULL)
*/
static inline const struct device_node *ofnode_to_np(ofnode node)
{
#ifdef OF_CHECKS
if (!of_live_active())
return NULL;
#endif
return node.np;
}
/**
* ofnode_to_offset() - convert an ofnode to a flat DT offset
*
* This cannot be called if the reference contains a node pointer.
*
* @node: Reference containing offset (possibly invalid)
* Return: DT offset (can be -1)
*/
static inline int ofnode_to_offset(ofnode node)
{
#ifdef OF_CHECKS
if (of_live_active())
return -1;
#endif
return node.of_offset;
}
/**
* ofnode_valid() - check if an ofnode is valid
*
* @node: Reference containing offset (possibly invalid)
* Return: true if the reference contains a valid ofnode, false if it is NULL
*/
static inline bool ofnode_valid(ofnode node)
{
if (of_live_active())
return node.np != NULL;
else
return node.of_offset >= 0;
}
/**
* offset_to_ofnode() - convert a DT offset to an ofnode
*
* @of_offset: DT offset (either valid, or -1)
* Return: reference to the associated DT offset
*/
static inline ofnode offset_to_ofnode(int of_offset)
{
ofnode node;
if (of_live_active())
node.np = NULL;
else
node.of_offset = of_offset >= 0 ? of_offset : -1;
return node;
}
/**
* np_to_ofnode() - convert a node pointer to an ofnode
*
* @np: Live node pointer (can be NULL)
* Return: reference to the associated node pointer
*/
static inline ofnode np_to_ofnode(const struct device_node *np)
{
ofnode node;
node.np = np;
return node;
}
/**
* ofnode_is_np() - check if a reference is a node pointer
*
* This function associated that if there is a valid live tree then all
* references will use it. This is because using the flat DT when the live tree
* is valid is not permitted.
*
* @node: reference to check (possibly invalid)
* Return: true if the reference is a live node pointer, false if it is a DT
* offset
*/
static inline bool ofnode_is_np(ofnode node)
{
#ifdef OF_CHECKS
/*
* Check our assumption that flat tree offsets are not used when a
* live tree is in use.
*/
assert(!ofnode_valid(node) ||
(of_live_active() ? ofnode_to_np(node)
: ofnode_to_np(node)));
#endif
return of_live_active() && ofnode_valid(node);
}
/**
* ofnode_equal() - check if two references are equal
*
* @ref1: first reference to check (possibly invalid)
* @ref2: second reference to check (possibly invalid)
* Return: true if equal, else false
*/
static inline bool ofnode_equal(ofnode ref1, ofnode ref2)
{
/* We only need to compare the contents */
return ref1.of_offset == ref2.of_offset;
}
/**
* ofnode_null() - Obtain a null ofnode
*
* This returns an ofnode which points to no node. It works both with the flat
* tree and livetree.
*/
static inline ofnode ofnode_null(void)
{
ofnode node;
if (of_live_active())
node.np = NULL;
else
node.of_offset = -1;
return node;
}
static inline ofnode ofnode_root(void)
{
ofnode node;
if (of_live_active())
node.np = gd_of_root();
else
node.of_offset = 0;
return node;
}
/**
* ofnode_name_eq() - Check if the node name is equivalent to a given name
* ignoring the unit address
*
* @node: valid node reference that has to be compared
* @name: name that has to be compared with the node name
* Return: true if matches, false if it doesn't match
*/
bool ofnode_name_eq(ofnode node, const char *name);
/**
* ofnode_read_u32() - Read a 32-bit integer from a property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @outp: place to put value (if found)
* Return: 0 if OK, -ve on error
*/
int ofnode_read_u32(ofnode node, const char *propname, u32 *outp);
/**
* ofnode_read_u32_index() - Read a 32-bit integer from a multi-value property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @index: index of the integer to return
* @outp: place to put value (if found)
* Return: 0 if OK, -ve on error
*/
int ofnode_read_u32_index(ofnode node, const char *propname, int index,
u32 *outp);
/**
* ofnode_read_s32() - Read a 32-bit integer from a property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @outp: place to put value (if found)
* Return: 0 if OK, -ve on error
*/
static inline int ofnode_read_s32(ofnode node, const char *propname,
s32 *outp)
{
return ofnode_read_u32(node, propname, (u32 *)outp);
}
/**
* ofnode_read_u32_default() - Read a 32-bit integer from a property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @def: default value to return if the property has no value
* Return: property value, or @def if not found
*/
u32 ofnode_read_u32_default(ofnode node, const char *propname, u32 def);
/**
* ofnode_read_u32_index_default() - Read a 32-bit integer from a multi-value
* property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @index: index of the integer to return
* @def: default value to return if the property has no value
* Return: property value, or @def if not found
*/
u32 ofnode_read_u32_index_default(ofnode node, const char *propname, int index,
u32 def);
/**
* ofnode_read_s32_default() - Read a 32-bit integer from a property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @def: default value to return if the property has no value
* Return: property value, or @def if not found
*/
int ofnode_read_s32_default(ofnode node, const char *propname, s32 def);
/**
* ofnode_read_u64() - Read a 64-bit integer from a property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @outp: place to put value (if found)
* Return: 0 if OK, -ve on error
*/
int ofnode_read_u64(ofnode node, const char *propname, u64 *outp);
/**
* ofnode_read_u64_default() - Read a 64-bit integer from a property
*
* @node: valid node reference to read property from
* @propname: name of the property to read from
* @def: default value to return if the property has no value
* Return: property value, or @def if not found
*/
u64 ofnode_read_u64_default(ofnode node, const char *propname, u64 def);
/**
* ofnode_read_prop() - Read a property from a node
*
* @node: valid node reference to read property from
* @propname: name of the property to read
* @sizep: if non-NULL, returns the size of the property, or an error code
* if not found
* Return: property value, or NULL if there is no such property
*/
const void *ofnode_read_prop(ofnode node, const char *propname, int *sizep);
/**
* ofnode_read_string() - Read a string from a property
*
* @node: valid node reference to read property from
* @propname: name of the property to read
* Return: string from property value, or NULL if there is no such property
*/
const char *ofnode_read_string(ofnode node, const char *propname);
/**
* ofnode_read_u32_array() - Find and read an array of 32 bit integers
*
* @node: valid node reference to read property from
* @propname: name of the property to read
* @out_values: pointer to return value, modified only if return value is 0
* @sz: number of array elements to read
* Return: 0 if OK, -ve on error
*
* Search for a property in a device node and read 32-bit value(s) from
* it. Returns 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.
*/
int ofnode_read_u32_array(ofnode node, const char *propname,
u32 *out_values, size_t sz);
/**
* ofnode_read_bool() - read a boolean value from a property
*
* @node: valid node reference to read property from
* @propname: name of property to read
* Return: true if property is present (meaning true), false if not present
*/
bool ofnode_read_bool(ofnode node, const char *propname);
/**
* ofnode_find_subnode() - find a named subnode of a parent node
*
* @node: valid reference to parent node
* @subnode_name: name of subnode to find
* Return: reference to subnode (which can be invalid if there is no such
* subnode)
*/
ofnode ofnode_find_subnode(ofnode node, const char *subnode_name);
#if CONFIG_IS_ENABLED(DM_INLINE_OFNODE)
#include <asm/global_data.h>
static inline bool ofnode_is_enabled(ofnode node)
{
if (ofnode_is_np(node)) {
return of_device_is_available(ofnode_to_np(node));
} else {
return fdtdec_get_is_enabled(gd->fdt_blob,
ofnode_to_offset(node));
}
}
static inline ofnode ofnode_first_subnode(ofnode node)
{
assert(ofnode_valid(node));
if (ofnode_is_np(node))
return np_to_ofnode(node.np->child);
return offset_to_ofnode(
fdt_first_subnode(gd->fdt_blob, ofnode_to_offset(node)));
}
static inline ofnode ofnode_next_subnode(ofnode node)
{
assert(ofnode_valid(node));
if (ofnode_is_np(node))
return np_to_ofnode(node.np->sibling);
return offset_to_ofnode(
fdt_next_subnode(gd->fdt_blob, ofnode_to_offset(node)));
}
#else
/**
* ofnode_is_enabled() - Checks whether a node is enabled.
* This looks for a 'status' property. If this exists, then returns true if
* the status is 'okay' and false otherwise. If there is no status property,
* it returns true on the assumption that anything mentioned should be enabled
* by default.
*
* @node: node to examine
* Return: false (not enabled) or true (enabled)
*/
bool ofnode_is_enabled(ofnode node);
/**
* ofnode_first_subnode() - find the first subnode of a parent node
*
* @node: valid reference to a valid parent node
* Return: reference to the first subnode (which can be invalid if the parent
* node has no subnodes)
*/
ofnode ofnode_first_subnode(ofnode node);
/**
* ofnode_next_subnode() - find the next sibling of a subnode
*
* @node: valid reference to previous node (sibling)
* Return: reference to the next subnode (which can be invalid if the node
* has no more siblings)
*/
ofnode ofnode_next_subnode(ofnode node);
#endif /* DM_INLINE_OFNODE */
/**
* ofnode_get_parent() - get the ofnode's parent (enclosing ofnode)
*
* @node: valid node to look up
* Return: ofnode reference of the parent node
*/
ofnode ofnode_get_parent(ofnode node);
/**
* ofnode_get_name() - get the name of a node
*
* @node: valid node to look up
* Return: name of node
*/
const char *ofnode_get_name(ofnode node);
/**
* ofnode_get_path() - get the full path of a node
*
* @node: valid node to look up
* @buf: buffer to write the node path into
* @buflen: buffer size
* Return: 0 if OK, -ve on error
*/
int ofnode_get_path(ofnode node, char *buf, int buflen);
/**
* ofnode_get_by_phandle() - get ofnode from phandle
*
* @phandle: phandle to look up
* Return: ofnode reference to the phandle
*/
ofnode ofnode_get_by_phandle(uint phandle);
/**
* ofnode_read_size() - read the size of a property
*
* @node: node to check
* @propname: property to check
* Return: size of property if present, or -EINVAL if not
*/
int ofnode_read_size(ofnode node, const char *propname);
/**
* ofnode_get_addr_size_index() - get an address/size from a node
* based on index
*
* This reads the register address/size from a node based on index
*
* @node: node to read from
* @index: Index of address to read (0 for first)
* @size: Pointer to size of the address
* Return: address, or FDT_ADDR_T_NONE if not present or invalid
*/
phys_addr_t ofnode_get_addr_size_index(ofnode node, int index,
fdt_size_t *size);
/**
* ofnode_get_addr_size_index_notrans() - get an address/size from a node
* based on index, without address
* translation
*
* This reads the register address/size from a node based on index.
* The resulting address is not translated. Useful for example for on-disk
* addresses.
*
* @node: node to read from
* @index: Index of address to read (0 for first)
* @size: Pointer to size of the address
* Return: address, or FDT_ADDR_T_NONE if not present or invalid
*/
phys_addr_t ofnode_get_addr_size_index_notrans(ofnode node, int index,
fdt_size_t *size);
/**
* ofnode_get_addr_index() - get an address from a node
*
* This reads the register address from a node
*
* @node: node to read from
* @index: Index of address to read (0 for first)
* Return: address, or FDT_ADDR_T_NONE if not present or invalid
*/
phys_addr_t ofnode_get_addr_index(ofnode node, int index);
/**
* ofnode_get_addr() - get an address from a node
*
* This reads the register address from a node
*
* @node: node to read from
* Return: address, or FDT_ADDR_T_NONE if not present or invalid
*/
phys_addr_t ofnode_get_addr(ofnode node);
/**
* ofnode_get_size() - get size from a node
*
* This reads the register size from a node
*
* @node: node to read from
* Return: size of the address, or FDT_SIZE_T_NONE if not present or invalid
*/
fdt_size_t ofnode_get_size(ofnode node);
/**
* ofnode_stringlist_search() - find a string in a string list and return index
*
* Note that it is possible for this function to succeed on property values
* that are not NUL-terminated. That's because the function will stop after
* finding the first occurrence of @string. This can for example happen with
* small-valued cell properties, such as #address-cells, when searching for
* the empty string.
*
* @node: node to check
* @propname: name of the property containing the string list
* @string: string to look up in the string list
*
* Return:
* the index of the string in the list of strings
* -ENODATA if the property is not found
* -EINVAL on some other error
*/
int ofnode_stringlist_search(ofnode node, const char *propname,
const char *string);
/**
* ofnode_read_string_index() - obtain an indexed string from a string list
*
* Note that this will successfully extract strings from properties with
* non-NUL-terminated values. For example on small-valued cell properties
* this function will return the empty string.
*
* If non-NULL, the length of the string (on success) or a negative error-code
* (on failure) will be stored in the integer pointer to by lenp.
*
* @node: node to check
* @propname: name of the property containing the string list
* @index: index of the string to return (cannot be negative)
* @outp: return location for the string
*
* Return:
* 0 if found or -ve error value if not found
*/
int ofnode_read_string_index(ofnode node, const char *propname, int index,
const char **outp);
/**
* ofnode_read_string_count() - find the number of strings in a string list
*
* @node: node to check
* @property: name of the property containing the string list
* Return:
* number of strings in the list, or -ve error value if not found
*/
int ofnode_read_string_count(ofnode node, const char *property);
/**
* ofnode_read_string_list() - read a list of strings
*
* This produces a list of string pointers with each one pointing to a string
* in the string list. If the property does not exist, it returns {NULL}.
*
* The data is allocated and the caller is reponsible for freeing the return
* value (the list of string pointers). The strings themselves may not be
* changed as they point directly into the devicetree property.
*
* @node: node to check
* @property: name of the property containing the string list
* @listp: returns an allocated, NULL-terminated list of strings if the return
* value is > 0, else is set to NULL
* Return:
* number of strings in list, 0 if none, -ENOMEM if out of memory,
* -EINVAL if no such property, -EENODATA if property is empty
*/
int ofnode_read_string_list(ofnode node, const char *property,
const char ***listp);
/**
* ofnode_parse_phandle_with_args() - Find a node pointed by phandle in a list
*
* 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:
*
* .. code-block::
*
* 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:
* ofnode_parse_phandle_with_args(node3, "list", "#list-cells", 0, 1, &args);
*
* @node: device tree node containing a list
* @list_name: property name that contains a list
* @cells_name: property name that specifies phandles' arguments count
* @cell_count: Cell count to use if @cells_name is NULL
* @index: index of a phandle to parse out
* @out_args: optional pointer to output arguments structure (will be filled)
* Return:
* 0 on success (with @out_args filled out if not NULL), -ENOENT if
* @list_name does not exist, -EINVAL if a phandle was not found,
* @cells_name could not be found, the arguments were truncated or there
* were too many arguments.
*/
int ofnode_parse_phandle_with_args(ofnode node, const char *list_name,
const char *cells_name, int cell_count,
int index,
struct ofnode_phandle_args *out_args);
/**
* ofnode_count_phandle_with_args() - Count number of phandle in a list
*
* This function is useful to count phandles into a list.
* Returns number of phandle on success, on error returns appropriate
* errno value.
*
* @node: device tree node containing a list
* @list_name: property name that contains a list
* @cells_name: property name that specifies phandles' arguments count
* @cell_count: Cell count to use if @cells_name is NULL
* Return:
* number of phandle on success, -ENOENT if @list_name does not exist,
* -EINVAL if a phandle was not found, @cells_name could not be found.
*/
int ofnode_count_phandle_with_args(ofnode node, const char *list_name,
const char *cells_name, int cell_count);
/**
* ofnode_path() - find a node by full path
*
* @path: Full path to node, e.g. "/bus/spi@1"
* Return: reference to the node found. Use ofnode_valid() to check if it exists
*/
ofnode ofnode_path(const char *path);
/**
* ofnode_read_chosen_prop() - get the value of a chosen property
*
* This looks for a property within the /chosen node and returns its value
*
* @propname: Property name to look for
* @sizep: Returns size of property, or `FDT_ERR_...` error code if function
* returns NULL
* Return: property value if found, else NULL
*/
const void *ofnode_read_chosen_prop(const char *propname, int *sizep);
/**
* ofnode_read_chosen_string() - get the string value of a chosen property
*
* This looks for a property within the /chosen node and returns its value,
* checking that it is a valid nul-terminated string
*
* @propname: Property name to look for
* Return: string value if found, else NULL
*/
const char *ofnode_read_chosen_string(const char *propname);
/**
* ofnode_get_chosen_node() - get a referenced node from the chosen node
*
* This looks up a named property in the chosen node and uses that as a path to
* look up a code.
*
* @propname: Property name to look for
* Return: the referenced node if present, else ofnode_null()
*/
ofnode ofnode_get_chosen_node(const char *propname);
/**
* ofnode_read_aliases_prop() - get the value of a aliases property
*
* This looks for a property within the /aliases node and returns its value
*
* @propname: Property name to look for
* @sizep: Returns size of property, or `FDT_ERR_...` error code if function
* returns NULL
* Return: property value if found, else NULL
*/
const void *ofnode_read_aliases_prop(const char *propname, int *sizep);
/**
* ofnode_get_aliases_node() - get a referenced node from the aliases node
*
* This looks up a named property in the aliases node and uses that as a path to
* look up a code.
*
* @propname: Property name to look for
* Return: the referenced node if present, else ofnode_null()
*/
ofnode ofnode_get_aliases_node(const char *propname);
struct display_timing;
/**
* ofnode_decode_display_timing() - decode display timings
*
* Decode display timings from the supplied 'display-timings' node.
* See doc/device-tree-bindings/video/display-timing.txt for binding
* information.
*
* @node: 'display-timing' node containing the timing subnodes
* @index: Index number to read (0=first timing subnode)
* @config: Place to put timings
* Return: 0 if OK, -FDT_ERR_NOTFOUND if not found
*/
int ofnode_decode_display_timing(ofnode node, int index,
struct display_timing *config);
/**
* ofnode_get_property() - get a pointer to the value of a node property
*
* @node: node to read
* @propname: property to read
* @lenp: place to put length on success
* Return: pointer to property, or NULL if not found
*/
const void *ofnode_get_property(ofnode node, const char *propname, int *lenp);
/**
* ofnode_get_first_property()- get the reference of the first property
*
* Get reference to the first property of the node, it is used to iterate
* and read all the property with ofnode_get_property_by_prop().
*
* @node: node to read
* @prop: place to put argument reference
* Return: 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
*/
int ofnode_get_first_property(ofnode node, struct ofprop *prop);
/**
* ofnode_get_next_property() - get the reference of the next property
*
* Get reference to the next property of the node, it is used to iterate
* and read all the property with ofnode_get_property_by_prop().
*
* @prop: reference of current argument and place to put reference of next one
* Return: 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
*/
int ofnode_get_next_property(struct ofprop *prop);
/**
* ofnode_get_property_by_prop() - get a pointer to the value of a property
*
* Get value for the property identified by the provided reference.
*
* @prop: reference on property
* @propname: If non-NULL, place to property name on success,
* @lenp: If non-NULL, place to put length on success
* Return: 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
*/
const void *ofnode_get_property_by_prop(const struct ofprop *prop,
const char **propname, int *lenp);
/**
* ofnode_is_available() - check if a node is marked available
*
* @node: node to check
* Return: true if node's 'status' property is "okay" (or is missing)
*/
bool ofnode_is_available(ofnode node);
/**
* ofnode_get_addr_size() - get address and size from a property
*
* This does no address translation. It simply reads an property that contains
* an address and a size value, one after the other.
*
* @node: node to read from
* @propname: property to read
* @sizep: place to put size value (on success)
* Return: address value, or FDT_ADDR_T_NONE on error
*/
phys_addr_t ofnode_get_addr_size(ofnode node, const char *propname,
phys_size_t *sizep);
/**
* ofnode_read_u8_array_ptr() - find an 8-bit array
*
* Look up a property in a node and return a pointer to its contents as a
* byte array of given length. The property must have at least enough data
* for the array (count bytes). It may have more, but this will be ignored.
* The data is not copied.
*
* @node: node to examine
* @propname: name of property to find
* @sz: number of array elements
* Return:
* pointer to byte array if found, or NULL if the property is not found or
* there is not enough data
*/
const uint8_t *ofnode_read_u8_array_ptr(ofnode node, const char *propname,
size_t sz);
/**
* ofnode_read_pci_addr() - look up a PCI address
*
* Look at an address property in a node and return the PCI address which
* corresponds to the given type in the form of fdt_pci_addr.
* The property must hold one fdt_pci_addr with a lengh.
*
* @node: node to examine
* @type: pci address type (FDT_PCI_SPACE_xxx)
* @propname: name of property to find
* @addr: returns pci address in the form of fdt_pci_addr
* Return:
* 0 if ok, -ENOENT if the property did not exist, -EINVAL if the
* format of the property was invalid, -ENXIO if the requested
* address type was not found
*/
int ofnode_read_pci_addr(ofnode node, enum fdt_pci_space type,
const char *propname, struct fdt_pci_addr *addr);
/**
* ofnode_read_pci_vendev() - look up PCI vendor and device id
*
* Look at the compatible property of a device node that represents a PCI
* device and extract pci vendor id and device id from it.
*
* @node: node to examine
* @vendor: vendor id of the pci device
* @device: device id of the pci device
* Return: 0 if ok, negative on error
*/
int ofnode_read_pci_vendev(ofnode node, u16 *vendor, u16 *device);
/**
* ofnode_read_addr_cells() - Get the number of address cells for a node
*
* This walks back up the tree to find the closest #address-cells property
* which controls the given node.
*
* @node: Node to check
* Return: number of address cells this node uses
*/
int ofnode_read_addr_cells(ofnode node);
/**
* ofnode_read_size_cells() - Get the number of size cells for a node
*
* This walks back up the tree to find the closest #size-cells property
* which controls the given node.
*
* @node: Node to check
* Return: number of size cells this node uses
*/
int ofnode_read_size_cells(ofnode node);
/**
* ofnode_read_simple_addr_cells() - Get the address cells property in a node
*
* This function matches fdt_address_cells().
*
* @node: Node to check
* Return: value of #address-cells property in this node, or 2 if none
*/
int ofnode_read_simple_addr_cells(ofnode node);
/**
* ofnode_read_simple_size_cells() - Get the size cells property in a node
*
* This function matches fdt_size_cells().
*
* @node: Node to check
* Return: value of #size-cells property in this node, or 2 if none
*/
int ofnode_read_simple_size_cells(ofnode node);
/**
* ofnode_pre_reloc() - check if a node should be bound before relocation
*
* Device tree nodes can be marked as needing-to-be-bound in the loader stages
* via special device tree properties.
*
* Before relocation this function can be used to check if nodes are required
* in either SPL or TPL stages.
*
* After relocation and jumping into the real U-Boot binary it is possible to
* determine if a node was bound in one of SPL/TPL stages.
*
* There are 4 settings currently in use
* - u-boot,dm-pre-proper: U-Boot proper pre-relocation only
* - u-boot,dm-pre-reloc: legacy and indicates any of TPL or SPL
* Existing platforms only use it to indicate nodes needed in
* SPL. Should probably be replaced by u-boot,dm-spl for new platforms.
* - u-boot,dm-spl: SPL and U-Boot pre-relocation
* - u-boot,dm-tpl: TPL and U-Boot pre-relocation
*
* @node: node to check
* Return: true if node is needed in SPL/TL, false otherwise
*/
bool ofnode_pre_reloc(ofnode node);
/**
* ofnode_read_resource() - Read a resource from a node
*
* Read resource information from a node at the given index
*
* @node: Node to read from
* @index: Index of resource to read (0 = first)
* @res: Returns resource that was read, on success
* Return: 0 if OK, -ve on error
*/
int ofnode_read_resource(ofnode node, uint index, struct resource *res);
/**
* ofnode_read_resource_byname() - Read a resource from a node by name
*
* Read resource information from a node matching the given name. This uses a
* 'reg-names' string list property with the names matching the associated
* 'reg' property list.
*
* @node: Node to read from
* @name: Name of resource to read
* @res: Returns resource that was read, on success
* Return: 0 if OK, -ve on error
*/
int ofnode_read_resource_byname(ofnode node, const char *name,
struct resource *res);
/**
* ofnode_by_compatible() - Find the next compatible node
*
* Find the next node after @from that is compatible with @compat
*
* @from: ofnode to start from (use ofnode_null() to start at the beginning)
* @compat: Compatible string to match
* Return: ofnode found, or ofnode_null() if none
*/
ofnode ofnode_by_compatible(ofnode from, const char *compat);
/**
* ofnode_by_prop_value() - Find the next node with given property value
*
* Find the next node after @from that has a @propname with a value
* @propval and a length @proplen.
*
* @from: ofnode to start from (use ofnode_null() to start at the
* beginning)
* @propname: property name to check
* @propval: property value to search for
* @proplen: length of the value in propval
* Return: ofnode found, or ofnode_null() if none
*/
ofnode ofnode_by_prop_value(ofnode from, const char *propname,
const void *propval, int proplen);
/**
* ofnode_for_each_subnode() - iterate over all subnodes of a parent
*
* @node: child node (ofnode, lvalue)
* @parent: parent node (ofnode)
*
* This is a wrapper around a for loop and is used like so::
*
* ofnode node;
* ofnode_for_each_subnode(node, parent) {
* Use node
* ...
* }
*
* Note that this is implemented as a macro and @node is used as
* iterator in the loop. The parent variable can be a constant or even a
* literal.
*/
#define ofnode_for_each_subnode(node, parent) \
for (node = ofnode_first_subnode(parent); \
ofnode_valid(node); \
node = ofnode_next_subnode(node))
/**
* ofnode_for_each_compatible_node() - iterate over all nodes with a given
* compatible string
*
* @node: child node (ofnode, lvalue)
* @compat: compatible string to match
*
* This is a wrapper around a for loop and is used like so::
*
* ofnode node;
* ofnode_for_each_compatible_node(node, parent, compatible) {
* Use node
* ...
* }
*
* Note that this is implemented as a macro and @node is used as
* iterator in the loop.
*/
#define ofnode_for_each_compatible_node(node, compat) \
for (node = ofnode_by_compatible(ofnode_null(), compat); \
ofnode_valid(node); \
node = ofnode_by_compatible(node, compat))
/**
* ofnode_get_child_count() - get the child count of a ofnode
*
* @parent: valid node to get its child count
* Return: the number of subnodes
*/
int ofnode_get_child_count(ofnode parent);
/**
* ofnode_translate_address() - Translate a device-tree address
*
* Translate an address from the device-tree into a CPU physical address. This
* function walks up the tree and applies the various bus mappings along the
* way.
*
* @node: Device tree node giving the context in which to translate the address
* @in_addr: pointer to the address to translate
* Return: the translated address; OF_BAD_ADDR on error
*/
u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr);
/**
* ofnode_translate_dma_address() - Translate a device-tree DMA address
*
* Translate a DMA address from the device-tree into a CPU physical address.
* This function walks up the tree and applies the various bus mappings along
* the way.
*
* @node: Device tree node giving the context in which to translate the
* DMA address
* @in_addr: pointer to the DMA address to translate
* Return: the translated DMA address; OF_BAD_ADDR on error
*/
u64 ofnode_translate_dma_address(ofnode node, const fdt32_t *in_addr);
/**
* ofnode_get_dma_range() - get dma-ranges for a specific DT node
*
* Get DMA ranges for a specifc node, this is useful to perform bus->cpu and
* cpu->bus address translations
*
* @node: Device tree node
* @cpu: Pointer to variable storing the range's cpu address
* @bus: Pointer to variable storing the range's bus address
* @size: Pointer to variable storing the range's size
* Return: translated DMA address or OF_BAD_ADDR on error
*/
int ofnode_get_dma_range(ofnode node, phys_addr_t *cpu, dma_addr_t *bus,
u64 *size);
/**
* ofnode_device_is_compatible() - check if the node is compatible with compat
*
* This allows to check whether the node is comaptible with the compat.
*
* @node: Device tree node for which compatible needs to be verified.
* @compat: Compatible string which needs to verified in the given node.
* Return: true if OK, false if the compatible is not found
*/
int ofnode_device_is_compatible(ofnode node, const char *compat);
/**
* ofnode_write_prop() - Set a property of a ofnode
*
* Note that the value passed to the function is *not* allocated by the
* function itself, but must be allocated by the caller if necessary.
*
* @node: The node for whose property should be set
* @propname: The name of the property to set
* @len: The length of the new value of the property
* @value: The new value of the property (must be valid prior to calling
* the function)
* Return: 0 if successful, -ve on error
*/
int ofnode_write_prop(ofnode node, const char *propname, int len,
const void *value);
/**
* ofnode_write_string() - Set a string property of a ofnode
*
* Note that the value passed to the function is *not* allocated by the
* function itself, but must be allocated by the caller if necessary.
*
* @node: The node for whose string property should be set
* @propname: The name of the string property to set
* @value: The new value of the string property (must be valid prior to
* calling the function)
* Return: 0 if successful, -ve on error
*/
int ofnode_write_string(ofnode node, const char *propname, const char *value);
/**
* ofnode_set_enabled() - Enable or disable a device tree node given by its
* ofnode
*
* This function effectively sets the node's "status" property to either "okay"
* or "disable", hence making it available for driver model initialization or
* not.
*
* @node: The node to enable
* @value: Flag that tells the function to either disable or enable the
* node
* Return: 0 if successful, -ve on error
*/
int ofnode_set_enabled(ofnode node, bool value);
/**
* ofnode_conf_read_bool() - Read a boolean value from the U-Boot config
*
* This reads a property from the /config node of the devicetree.
*
* See doc/config.txt for bindings
*
* @prop_name: property name to look up
* Return: true, if it exists, false if not
*/
bool ofnode_conf_read_bool(const char *prop_name);
/**
* ofnode_conf_read_int() - Read an integer value from the U-Boot config
*
* This reads a property from the /config node of the devicetree.
*
* See doc/config.txt for bindings
*
* @prop_name: property name to look up
* @default_val: default value to return if the property is not found
* Return: integer value, if found, or @default_val if not
*/
int ofnode_conf_read_int(const char *prop_name, int default_val);
/**
* ofnode_conf_read_str() - Read a string value from the U-Boot config
*
* This reads a property from the /config node of the devicetree.
*
* See doc/config.txt for bindings
*
* @prop_name: property name to look up
* Return: string value, if found, or NULL if not
*/
const char *ofnode_conf_read_str(const char *prop_name);
#endif