software node: Add software_node_find_by_name()

Function that searches software nodes by node name.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index e7b3aa3..ee2a405 100644 (file)
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -620,6 +620,43 @@ static const struct fwnode_operations software_node_ops = {
 
 /* -------------------------------------------------------------------------- */
 
+/**
+ * software_node_find_by_name - Find software node by name
+ * @parent: Parent of the software node
+ * @name: Name of the software node
+ *
+ * The function will find a node that is child of @parent and that is named
+ * @name. If no node is found, the function returns NULL.
+ *
+ * NOTE: you will need to drop the reference with fwnode_handle_put() after use.
+ */
+const struct software_node *
+software_node_find_by_name(const struct software_node *parent, const char *name)
+{
+       struct swnode *swnode;
+       struct kobject *k;
+
+       if (!name)
+               return NULL;
+
+       spin_lock(&swnode_kset->list_lock);
+
+       list_for_each_entry(k, &swnode_kset->list, entry) {
+               swnode = kobj_to_swnode(k);
+               if (parent == swnode->node->parent && swnode->node->name &&
+                   !strcmp(name, swnode->node->name)) {
+                       kobject_get(&swnode->kobj);
+                       break;
+               }
+               swnode = NULL;
+       }
+
+       spin_unlock(&swnode_kset->list_lock);
+
+       return swnode ? swnode->node : NULL;
+}
+EXPORT_SYMBOL_GPL(software_node_find_by_name);
+
 static int
 software_node_register_properties(struct software_node *node,
                                  const struct property_entry *properties)

diff --git a/include/linux/property.h b/include/linux/property.h
index 5a910ad..9b3d4ca 100644 (file)
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -421,6 +421,10 @@ bool is_software_node(const struct fwnode_handle *fwnode);
 const struct software_node *to_software_node(struct fwnode_handle *fwnode);
 struct fwnode_handle *software_node_fwnode(const struct software_node *node);
 
+const struct software_node *
+software_node_find_by_name(const struct software_node *parent,
+                          const char *name);
+
 int software_node_register_nodes(const struct software_node *nodes);
 void software_node_unregister_nodes(const struct software_node *nodes);