diff options
Diffstat (limited to 'include/libfdt.h')
| -rw-r--r-- | include/libfdt.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/include/libfdt.h b/include/libfdt.h index a1ef1e15df..f3cbb637be 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -163,6 +163,31 @@ int fdt_first_subnode(const void *fdt, int offset); */ int fdt_next_subnode(const void *fdt, int offset); +/** + * fdt_for_each_subnode - iterate over all subnodes of a parent + * + * This is actually a wrapper around a for loop and would be used like so: + * + * fdt_for_each_subnode(fdt, node, parent) { + * ... + * use node + * ... + * } + * + * Note that this is implemented as a macro and node is used as iterator in + * the loop. It should therefore be a locally allocated variable. The parent + * variable on the other hand is never modified, so it can be constant or + * even a literal. + * + * @fdt: FDT blob (const void *) + * @node: child node (int) + * @parent: parent node (int) + */ +#define fdt_for_each_subnode(fdt, node, parent) \ + for (node = fdt_first_subnode(fdt, parent); \ + node >= 0; \ + node = fdt_next_subnode(fdt, node)) + /**********************************************************************/ /* General functions */ /**********************************************************************/ @@ -857,6 +882,53 @@ int fdt_node_offset_by_compatible(const void *fdt, int startoffset, */ int fdt_stringlist_contains(const char *strlist, int listlen, const char *str); +/** + * fdt_count_strings - count the number of strings in a string list + * @fdt: pointer to the device tree blob + * @node: offset of the node + * @property: name of the property containing the string list + * @return: the number of strings in the given property + */ +int fdt_count_strings(const void *fdt, int node, const char *property); + +/** + * fdt_find_string - find a string in a string list and return its index + * @fdt: pointer to the device tree blob + * @node: offset of the node + * @property: name of the property containing the string list + * @string: string to look up in the string list + * @return: the index of the string or negative on error + */ +int fdt_find_string(const void *fdt, int node, const char *property, + const char *string); + +/** + * fdt_get_string_index() - obtain the string at a given index in a string list + * @fdt: pointer to the device tree blob + * @node: offset of the node + * @property: name of the property containing the string list + * @index: index of the string to return + * @output: return location for the string + * @return: 0 if the string was found or a negative error code otherwise + */ +int fdt_get_string_index(const void *fdt, int node, const char *property, + int index, const char **output); + +/** + * fdt_get_string() - obtain the string at a given index in a string list + * @fdt: pointer to the device tree blob + * @node: offset of the node + * @property: name of the property containing the string list + * @output: return location for the string + * @return: 0 if the string was found or a negative error code otherwise + * + * This is a shortcut for: + * + * fdt_get_string_index(fdt, node, property, 0, output). + */ +int fdt_get_string(const void *fdt, int node, const char *property, + const char **output); + /**********************************************************************/ /* Read-only functions (addressing related) */ /**********************************************************************/ |
