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[POWERPC] Add of_find_matching_node() helper function

Browse source 
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 <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
This commit is contained in:
Grant Likely 2008-01-09 06:20:40 +11:00 • committed by Paul Mackerras
commit 283029d16a
10 changed files with 73 additions and 32 deletions
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58
drivers/of/base.c
View file

@ -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);

29
drivers/of/device.c
View file

@ -9,35 +9,6 @@
#include <asm/errno.h>
/**
* of_match_node - Tell if an device_node has a matching of_match structure
* @ids: 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_match_device - Tell if an of_device structure has a matching
* of_match structure