netdev - [PATCH 09/13] net: dsa: lan9303: Added Documentation/networking/dsa/lan9303.txt

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Date:   Tue, 11 Jul 2017 13:48:25 +0200
From:   Egil Hjelmeland <egil.hjelmeland@...itel.com>
To:     <corbet@....net>, <andrew@...n.ch>,
        <vivien.didelot@...oirfairelinux.com>, <f.fainelli@...il.com>,
        <davem@...emloft.net>, <kernel@...gutronix.de>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>
CC:     <egil.hjelmeland@...itel.com>
Subject: [PATCH 09/13] net: dsa: lan9303: Added
 Documentation/networking/dsa/lan9303.txt

Signed-off-by: Egil Hjelmeland <egil.hjelmeland@...itel.com>
---
 Documentation/networking/dsa/lan9303.txt | 48 ++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Documentation/networking/dsa/lan9303.txt

diff --git a/Documentation/networking/dsa/lan9303.txt b/Documentation/networking/dsa/lan9303.txt
new file mode 100644
index 000000000000..1fd72ff4b492
--- /dev/null
+++ b/Documentation/networking/dsa/lan9303.txt
@@ -0,0 +1,48 @@
+LAN9303 Ethernet switch driver
+==============================
+
+The LAN9303 is a three port 10/100 ethernet switch with integrated phys
+for the two external ethernet ports. The third port is an RMII/MII
+interface to a host master network interface (e.g. fixed link).
+
+
+Driver details
+==============
+
+The driver is implemented as a DSA driver, see
+Documentation/networking/dsa/dsa.txt.
+
+See Documentation/devicetree/bindings/net/dsa/lan9303.txt for device
+tree binding.
+
+The LAN9303 can be managed both via MDIO and I2C, both supported by this
+driver.
+
+At startup the driver configures the device to provide two separate
+network interfaces (which is the default state of a DSA device).
+
+When both user ports are joined to the same bridge, the normal
+HW MAC learning is enabled. This means that unicast traffic is forwarded
+in HW. STP is also supported in this mode.
+
+If one of the user ports leave the bridge,
+the ports goes back to the initial separated operation.
+
+The driver implements the port_fdb_xxx/port_mdb_xxx methods.
+
+
+Sysfs nodes
+===========
+
+When a user port is enabled, the driver creates sysfs directory
+/sys/class/net/xxx/lan9303 with the following files:
+
+ - swe_bcst_throt (RW): Set/get 6.4.7 Broadcast Storm Control
+      Throttle Level for the port. Accesses the corresponding bits of
+      the SWE_BCST_THROT register (13.4.3.23).
+
+
+Driver limitations
+==================
+
+ - No support for VLAN
-- 
2.11.0


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