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author | Michael Ellerman <michael@ellerman.id.au> | 2008-11-12 18:54:42 +0000 |
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committer | Paul Mackerras <paulus@samba.org> | 2008-11-19 16:05:00 +1100 |
commit | 1e291b14c8f1101b9093434489bd4dc0e03f3d0f (patch) | |
tree | ea602cce082e847d693b021d83f1314e9494c9a9 /drivers/of | |
parent | ae564c63b8311fa73c21e456e00dba1f4b1ff6bc (diff) | |
download | op-kernel-dev-1e291b14c8f1101b9093434489bd4dc0e03f3d0f.zip op-kernel-dev-1e291b14c8f1101b9093434489bd4dc0e03f3d0f.tar.gz |
of: Add helpers for finding device nodes which have a given property
This commit adds a routine for finding a device node which has a
certain property. The contents of the property are not taken into
account, merely the presence or absence of the property.
Based on that routine, we add a for_each_ macro for iterating over all
nodes that have a certain property.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/of')
-rw-r--r-- | drivers/of/base.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 7c79e94..4f884a3 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 |