[PATCH] software_node: Add kernel-doc comments to exported symbols

[Daniel Scally]

A number of functions which are exported via EXPORT_SYMBOL_GPL() lack any
kernel-doc comments; add those in so all exported symbols are documented.

Signed-off-by: Daniel Scally <djrscally@xxxxxxxxx>
---
With a view to maybe writing some documentation once the fwnode_graph_*()
functions are also added.

 drivers/base/swnode.c | 52 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 4a4b2008fbc2..ea52e5e9af92 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -33,6 +33,13 @@ static struct kset *swnode_kset;
 
 static const struct fwnode_operations software_node_ops;
 
+/**
+ * is_software_node() - check if given fwnode was created from a software_node
+ * @fwnode: The &struct fwnode_handle to check
+ *
+ * This function is used to check whether a given fwnode_handle was created by
+ * registering a &struct software_node or not.
+ */
 bool is_software_node(const struct fwnode_handle *fwnode)
 {
 	return !IS_ERR_OR_NULL(fwnode) && fwnode->ops == &software_node_ops;
@@ -71,6 +78,14 @@ software_node_to_swnode(const struct software_node *node)
 	return swnode;
 }
 
+/**
+ * to_software_node() - Fetch software_node associated with a given fwnode_handle
+ * @fwnode: The pointer to a &struct fwnode_handle to parse
+ *
+ * This function attempts to fetch a pointer to the &struct software_node which
+ * was used to create a given fwnode_handle. Note that this will only work if
+ * the software_node has **not** been released.
+ */
 const struct software_node *to_software_node(const struct fwnode_handle *fwnode)
 {
 	const struct swnode *swnode = to_swnode(fwnode);
@@ -79,6 +94,14 @@ const struct software_node *to_software_node(const struct fwnode_handle *fwnode)
 }
 EXPORT_SYMBOL_GPL(to_software_node);
 
+/**
+ * software_node_fwnode() - Fetch fwnode_handle associated with a given software_node
+ * @node: The pointer to a &struct software_node to parse
+ *
+ * This function attempts to fetch a pointer to the &struct fwnode_handle which
+ * was created from a given software_node. Note that this will only work after
+ * the software_node has been registered.
+ */
 struct fwnode_handle *software_node_fwnode(const struct software_node *node)
 {
 	struct swnode *swnode = software_node_to_swnode(node);
@@ -800,6 +823,26 @@ void software_node_unregister(const struct software_node *node)
 }
 EXPORT_SYMBOL_GPL(software_node_unregister);
 
+/**
+ * fwnode_create_software_node() - Create and register a new software_node
+ * @properties: NULL terminated array of properties to assign to the new node
+ * @parent: Pointer to a fwnode_handle to assign as parent to the new node
+ *
+ * NOTE: The pointer passed to @parent **must** be to a fwnode_handle that was
+ * created by registering a &struct software_node, meaning is_software_node()
+ * must return true when passed that pointer.
+ *
+ * This function creates a new instance of struct software_node, assigns it a
+ * copy of the given array of properties and registers it as a new fwnode_handle.
+ * Freeing of the allocated memory when the fwnode_handle is no longer needed is
+ * handled via software_node_release() and does not need to be done separately.
+ *
+ * Returns:
+ * * fwnode_handle *	- On success
+ * * -EINVAL		- When @parent is not associated with a software_node
+ * * -ENOMEM		- When memory allocation fails
+ * * -Other		- Propagated errors from sub-functions
+ */
 struct fwnode_handle *
 fwnode_create_software_node(const struct property_entry *properties,
 			    const struct fwnode_handle *parent)
@@ -832,6 +875,15 @@ fwnode_create_software_node(const struct property_entry *properties,
 }
 EXPORT_SYMBOL_GPL(fwnode_create_software_node);
 
+/**
+ * fwnode_remove_software_node() - Put a reference to a registered software_node
+ * @fwnode: The pointer to the &struct fwnode_handle you want to release
+ *
+ * Release a reference to a registered &struct software_node. This function
+ * differs from software_node_put() in that it takes no action if the
+ * fwnode_handle passed to @fwnode turns out not to have been created by
+ * registering a software_node
+ */
 void fwnode_remove_software_node(struct fwnode_handle *fwnode)
 {
 	struct swnode *swnode = to_swnode(fwnode);
-- 
2.25.1