Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc

[pandora-kernel.git] / drivers / of / base.c

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 9377f3b..9bd7c4a 100644 (file)
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -116,6 +116,32 @@ int of_device_is_compatible(const struct device_node *device,
 }
 EXPORT_SYMBOL(of_device_is_compatible);
 
+/**
+ *  of_device_is_available - check if a device is available for use
+ *
+ *  @device: Node to check for availability
+ *
+ *  Returns 1 if the status property is absent or set to "okay" or "ok",
+ *  0 otherwise
+ */
+int of_device_is_available(const struct device_node *device)
+{
+       const char *status;
+       int statlen;
+
+       status = of_get_property(device, "status", &statlen);
+       if (status == NULL)
+               return 1;
+
+       if (statlen > 0) {
+               if (!strcmp(status, "okay") || !strcmp(status, "ok"))
+                       return 1;
+       }
+
+       return 0;
+}
+EXPORT_SYMBOL(of_device_is_available);
+
 /**
  *     of_get_parent - Get a node's parent if any
  *     @node:  Node to get parent
@@ -137,6 +163,31 @@ struct device_node *of_get_parent(const struct device_node *node)
 }
 EXPORT_SYMBOL(of_get_parent);
 
+/**
+ *     of_get_next_parent - Iterate to a node's parent
+ *     @node:  Node to get parent of
+ *
+ *     This is like of_get_parent() except that it drops the
+ *     refcount on the passed node, making it suitable for iterating
+ *     through a node's parents.
+ *
+ *     Returns a node pointer with refcount incremented, use
+ *     of_node_put() on it when done.
+ */
+struct device_node *of_get_next_parent(struct device_node *node)
+{
+       struct device_node *parent;
+
+       if (!node)
+               return NULL;
+
+       read_lock(&devtree_lock);
+       parent = of_node_get(node->parent);
+       of_node_put(node);
+       read_unlock(&devtree_lock);
+       return parent;
+}
+
 /**
  *     of_get_next_child - Iterate a node childs
  *     @node:  parent node
@@ -273,3 +324,61 @@ 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);