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-rw-r--r--Documentation/doc-guide/kernel-doc.rst46
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/doc-guide/kernel-doc.rst b/Documentation/doc-guide/kernel-doc.rst
index 14c226e8154f..722d4525f7cf 100644
--- a/Documentation/doc-guide/kernel-doc.rst
+++ b/Documentation/doc-guide/kernel-doc.rst
@@ -281,6 +281,52 @@ comment block.
The kernel-doc data structure comments describe each member of the structure,
in order, with the member descriptions.
+Nested structs/unions
+~~~~~~~~~~~~~~~~~~~~~
+
+It is possible to document nested structs unions, like::
+
+ /**
+ * struct nested_foobar - a struct with nested unions and structs
+ * @arg1: - first argument of anonymous union/anonymous struct
+ * @arg2: - second argument of anonymous union/anonymous struct
+ * @arg3: - third argument of anonymous union/anonymous struct
+ * @arg4: - fourth argument of anonymous union/anonymous struct
+ * @bar.st1.arg1 - first argument of struct st1 on union bar
+ * @bar.st1.arg2 - second argument of struct st1 on union bar
+ * @bar.st2.arg1 - first argument of struct st2 on union bar
+ * @bar.st2.arg2 - second argument of struct st2 on union bar
+ struct nested_foobar {
+ /* Anonymous union/struct*/
+ union {
+ struct {
+ int arg1;
+ int arg2;
+ }
+ struct {
+ void *arg3;
+ int arg4;
+ }
+ }
+ union {
+ struct {
+ int arg1;
+ int arg2;
+ } st1;
+ struct {
+ void *arg1;
+ int arg2;
+ } st2;
+ } bar;
+ };
+
+.. note::
+
+ #) When documenting nested structs or unions, if the struct/union ``foo``
+ is named, the argument ``bar`` inside it should be documented as
+ ``@foo.bar:``
+ #) When the nested struct/union is anonymous, the argument ``bar`` on it
+ should be documented as ``@bar:``
Typedef documentation
---------------------