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| author | Timur Tabi <timur@freescale.com> | 2012-08-14 13:20:23 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-08-20 02:16:00 -0700 |
| commit | 3296193d1421c2d6f9e49e181cecfd917f0f5764 (patch) | |
| tree | e3252ad5cd1979bbdf64f46975b602f474fa2bb3 | |
| parent | 476ad154f3b41dd7d9a08a2f641e28388abc2fd1 (diff) | |
| download | linux-3.10-3296193d1421c2d6f9e49e181cecfd917f0f5764.tar.gz linux-3.10-3296193d1421c2d6f9e49e181cecfd917f0f5764.tar.bz2 linux-3.10-3296193d1421c2d6f9e49e181cecfd917f0f5764.zip | |
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 <timur@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/of/base.c | 27 | ||||
| -rw-r--r-- | include/linux/of.h | 7 |
2 files changed, 34 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index c181b94abc3..d4a1c9a043e 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -364,6 +364,33 @@ 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 * diff --git a/include/linux/of.h b/include/linux/of.h index 5919ee33f2b..1b1163225f3 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -190,10 +190,17 @@ extern struct device_node *of_get_parent(const struct device_node *node); extern struct device_node *of_get_next_parent(struct device_node *node); extern struct device_node *of_get_next_child(const struct device_node *node, struct device_node *prev); +extern struct device_node *of_get_next_available_child( + const struct device_node *node, struct device_node *prev); + #define for_each_child_of_node(parent, child) \ for (child = of_get_next_child(parent, NULL); child != NULL; \ child = of_get_next_child(parent, child)) +#define for_each_available_child_of_node(parent, child) \ + for (child = of_get_next_available_child(parent, NULL); child != NULL; \ + child = of_get_next_available_child(parent, child)) + static inline int of_get_child_count(const struct device_node *np) { struct device_node *child; |