diff options
author | Grant Likely <grant.likely@secretlab.ca> | 2008-01-08 19:20:40 (GMT) |
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committer | Paul Mackerras <paulus@samba.org> | 2008-01-17 03:53:22 (GMT) |
commit | 283029d16a882539ab0027afd94ac52858d050b2 (patch) | |
tree | 78ad81fba51de1fbafd30706f162dc9315690e8b /drivers/of/base.c | |
parent | 91bbbe22dbd6d156b7059af13adb26a978a45661 (diff) | |
download | linux-283029d16a882539ab0027afd94ac52858d050b2.tar.xz |
[POWERPC] Add of_find_matching_node() helper function
Similar to of_find_compatible_node(), of_find_matching_node() and
for_each_matching_node() allow you to iterate over the device tree
looking for specific nodes, except that they take of_device_id
tables instead of strings.
This also moves of_match_node() from driver/of/device.c to
driver/of/base.c to colocate it with the of_find_matching_node which
depends on it.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'drivers/of/base.c')
-rw-r--r-- | drivers/of/base.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 9377f3b..b306fef 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -273,3 +273,61 @@ struct device_node *of_find_compatible_node(struct device_node *from, return np; } EXPORT_SYMBOL(of_find_compatible_node); + +/** + * 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 + * + * Low level utility function used by device matching. + */ +const struct of_device_id *of_match_node(const struct of_device_id *matches, + const struct device_node *node) +{ + while (matches->name[0] || matches->type[0] || matches->compatible[0]) { + int match = 1; + if (matches->name[0]) + match &= node->name + && !strcmp(matches->name, node->name); + if (matches->type[0]) + match &= node->type + && !strcmp(matches->type, node->type); + if (matches->compatible[0]) + match &= of_device_is_compatible(node, + matches->compatible); + if (match) + return matches; + matches++; + } + return NULL; +} +EXPORT_SYMBOL(of_match_node); + +/** + * of_find_matching_node - Find a node based on an of_device_id match + * table. + * @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 + * @matches: array of of device match structures to search in + * + * Returns a node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_find_matching_node(struct device_node *from, + const struct of_device_id *matches) +{ + struct device_node *np; + + read_lock(&devtree_lock); + np = from ? from->allnext : allnodes; + for (; np; np = np->allnext) { + if (of_match_node(matches, np) && of_node_get(np)) + break; + } + of_node_put(from); + read_unlock(&devtree_lock); + return np; +} +EXPORT_SYMBOL(of_find_matching_node); |