software node: Add support for static node descriptors

Until now the software nodes could only be created
dynamically with fwnode_create_software_node() function.
This introduces struct software_node data structure, which
makes it possible to describe the software nodes also
statically.

The statically described software nodes can be registered
with a new function fwnode_register_software_node(). This
also adds a helper fwnode_register_software_nodes()
which makes it possible to register an array of struct
software_nodes, i.e. multiple nodes at the same time.

There is no difference between statically described and
dynamically allocated software nodes. Even the registration
does not differ, except that during node creation the device
properties are only copied if the node is created
dynamically. With statically described nodes, the property
entries in the descriptor (struct software_node) are
assigned directly to the new software node that is being
created without any copies.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/linux/property.h

@@ -332,7 +332,26 @@ int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 /* -------------------------------------------------------------------------- */
 /* Software fwnode support - when HW description is incomplete or missing */
 
+/**
+ * struct software_node - Software node description
+ * @name: Name of the software node
+ * @parent: Parent of the software node
+ * @properties: Array of device properties
+ */
+struct software_node {
+	const char *name;
+	const struct software_node *parent;
+	const struct property_entry *properties;
+};
+
 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);
+
+int software_node_register_nodes(const struct software_node *nodes);
+void software_node_unregister_nodes(const struct software_node *nodes);
+
+int software_node_register(const struct software_node *node);
 
 int software_node_notify(struct device *dev, unsigned long action);