netdev - [PATCH net 05/15] docs: net: dsa: document change_tag

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Message-Id: <20220716185344.1212091-6-vladimir.oltean@nxp.com>
Date:   Sat, 16 Jul 2022 21:53:34 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: [PATCH net 05/15] docs: net: dsa: document change_tag_protocol

Support for changing the tagging protocol was added without this
operation being documented; do so now.

Fixes: 53da0ebaad10 ("net: dsa: allow changing the tag protocol via the "tagging" device attribute")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 Documentation/networking/dsa/dsa.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/networking/dsa/dsa.rst b/Documentation/networking/dsa/dsa.rst
index 76b0bc1abbae..83c1a02376c8 100644
--- 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
-- 
2.34.1