diff options
| -rw-r--r-- | drivers/of/base.c | 35 | ||||
| -rw-r--r-- | include/linux/of.h | 6 |
2 files changed, 41 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 7c79e94a35e..4f884a358a7 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -329,6 +329,41 @@ struct device_node *of_find_compatible_node(struct device_node *from, EXPORT_SYMBOL(of_find_compatible_node); /** + * of_find_node_with_property - Find a node which has a property with + * the given name. + * @from: The node to start searching from or NULL, the node + * you pass will not be searched, only the next one + * will; typically, you pass what the previous call + * returned. of_node_put() will be called on it + * @prop_name: The name of the property to look for. + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_find_node_with_property(struct device_node *from, + const char *prop_name) +{ + struct device_node *np; + struct property *pp; + + read_lock(&devtree_lock); + np = from ? from->allnext : allnodes; + for (; np; np = np->allnext) { + for (pp = np->properties; pp != 0; pp = pp->next) { + if (of_prop_cmp(pp->name, prop_name) == 0) { + of_node_get(np); + goto out; + } + } + } +out: + of_node_put(from); + read_unlock(&devtree_lock); + return np; +} +EXPORT_SYMBOL(of_find_node_with_property); + +/** * of_match_node - Tell if an device_node has a matching of_match structure * @matches: array of of device match structures to search in * @node: the of device structure to match against diff --git a/include/linux/of.h b/include/linux/of.h index e2488f5e7cb..6a7efa242f5 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -57,6 +57,12 @@ extern struct device_node *of_get_next_child(const struct device_node *node, for (child = of_get_next_child(parent, NULL); child != NULL; \ child = of_get_next_child(parent, child)) +extern struct device_node *of_find_node_with_property( + struct device_node *from, const char *prop_name); +#define for_each_node_with_property(dn, prop_name) \ + for (dn = of_find_node_with_property(NULL, prop_name); dn; \ + dn = of_find_node_with_property(dn, prop_name)) + extern struct property *of_find_property(const struct device_node *np, const char *name, int *lenp); |