docs: net: dsa: document change_tag_protocol

[linux-2.6-microblaze.git] / Documentation / networking / dsa / dsa.rst

diff --git a/Documentation/networking/dsa/dsa.rst b/Documentation/networking/dsa/dsa.rst
index 76b0bc1..83c1a02 100644 (file)
--- a/Documentation/networking/dsa/dsa.rst
+++ b/Documentation/networking/dsa/dsa.rst
@@ -600,6 +600,12 @@ Switch configuration
   upstream switch, in case there are hardware limitations in terms of supported
   tag formats.
 
+- ``change_tag_protocol``: when the default tagging protocol has compatibility
+  problems with the master or other issues, the driver may support changing it
+  at runtime, either through a device tree property or through sysfs. In that
+  case, further calls to ``get_tag_protocol`` should report the protocol in
+  current use.
+
 - ``setup``: setup function for the switch, this function is responsible for setting
   up the ``dsa_switch_ops`` private structure with all it needs: register maps,
   interrupts, mutexes, locks, etc. This function is also expected to properly