X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=drivers%2Fof%2Fbase.c;h=9bd7c4a31253a5d7349d5b2fd3cb383e826d9680;hb=585468e5d5962660867c269e26f0a4b89a599473;hp=b306fef1ac4151dffe03a89d4328ca4e6f703547;hpb=8f859016ea49cd8d7c743533bd1ab3db9a813ffa;p=deliverable%2Flinux.git

diff --git a/drivers/of/base.c b/drivers/of/base.c
index b306fef1ac41..9bd7c4a31253 100644
--- 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