From 3296193d1421c2d6f9e49e181cecfd917f0f5764 Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Tue, 14 Aug 2012 13:20:23 +0000 Subject: dt: introduce for_each_available_child_of_node, of_get_next_available_child Macro for_each_child_of_node() makes it easy to iterate over all of the children for a given device tree node, including those nodes that are marked as unavailable (i.e. status = "disabled"). Introduce for_each_available_child_of_node(), which is like for_each_child_of_node(), but it automatically skips unavailable nodes. This also requires the introduction of helper function of_get_next_available_child(), which returns the next available child node. Signed-off-by: Timur Tabi Signed-off-by: David S. Miller --- drivers/of/base.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'drivers/of') diff --git a/drivers/of/base.c b/drivers/of/base.c index c181b94abc36..d4a1c9a043e1 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -363,6 +363,33 @@ struct device_node *of_get_next_child(const struct device_node *node, } EXPORT_SYMBOL(of_get_next_child); +/** + * of_get_next_available_child - Find the next available child node + * @node: parent node + * @prev: previous child of the parent node, or NULL to get first + * + * This function is like of_get_next_child(), except that it + * automatically skips any disabled nodes (i.e. status = "disabled"). + */ +struct device_node *of_get_next_available_child(const struct device_node *node, + struct device_node *prev) +{ + struct device_node *next; + + read_lock(&devtree_lock); + next = prev ? prev->sibling : node->child; + for (; next; next = next->sibling) { + if (!of_device_is_available(next)) + continue; + if (of_node_get(next)) + break; + } + of_node_put(prev); + read_unlock(&devtree_lock); + return next; +} +EXPORT_SYMBOL(of_get_next_available_child); + /** * of_find_node_by_path - Find a node matching a full OF path * @path: The full path to match -- cgit v1.2.3-59-g8ed1b