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device property: Add functions for accessing node's parents
Add two convenience functions for accessing node's parents: fwnode_count_parents() returns the number of parent nodes a given node has. fwnode_get_nth_parent() returns node's parent at a given distance from the node itself. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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2 changed files with 49 additions and 0 deletions
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@ -590,6 +590,52 @@ struct fwnode_handle *fwnode_get_next_parent(struct fwnode_handle *fwnode)
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}
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EXPORT_SYMBOL_GPL(fwnode_get_next_parent);
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/**
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* fwnode_count_parents - Return the number of parents a node has
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* @fwnode: The node the parents of which are to be counted
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*
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* Returns the number of parents a node has.
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*/
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unsigned int fwnode_count_parents(const struct fwnode_handle *fwnode)
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{
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struct fwnode_handle *__fwnode;
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unsigned int count;
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__fwnode = fwnode_get_parent(fwnode);
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for (count = 0; __fwnode; count++)
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__fwnode = fwnode_get_next_parent(__fwnode);
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return count;
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}
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EXPORT_SYMBOL_GPL(fwnode_count_parents);
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/**
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* fwnode_get_nth_parent - Return an nth parent of a node
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* @fwnode: The node the parent of which is requested
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* @depth: Distance of the parent from the node
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*
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* Returns the nth parent of a node. If there is no parent at the requested
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* @depth, %NULL is returned. If @depth is 0, the functionality is equivalent to
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* fwnode_handle_get(). For @depth == 1, it is fwnode_get_parent() and so on.
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*
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* The caller is responsible for calling fwnode_handle_put() for the returned
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* node.
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*/
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struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwnode,
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unsigned int depth)
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{
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unsigned int i;
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fwnode_handle_get(fwnode);
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for (i = 0; i < depth && fwnode; i++)
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fwnode = fwnode_get_next_parent(fwnode);
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return fwnode;
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}
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EXPORT_SYMBOL_GPL(fwnode_get_nth_parent);
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/**
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* fwnode_get_next_child_node - Return the next child node handle for a node
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* @fwnode: Firmware node to find the next child node for.
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@ -83,6 +83,9 @@ struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode,
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struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode);
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struct fwnode_handle *fwnode_get_next_parent(
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struct fwnode_handle *fwnode);
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unsigned int fwnode_count_parents(const struct fwnode_handle *fwn);
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struct fwnode_handle *fwnode_get_nth_parent(struct fwnode_handle *fwn,
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unsigned int depth);
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struct fwnode_handle *fwnode_get_next_child_node(
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const struct fwnode_handle *fwnode, struct fwnode_handle *child);
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struct fwnode_handle *fwnode_get_next_available_child_node(
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