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-rw-r--r--Documentation/networking/phy.rst7
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diff --git a/Documentation/networking/phy.rst b/Documentation/networking/phy.rst
index f64641417c54..7f159043ad5a 100644
--- a/Documentation/networking/phy.rst
+++ b/Documentation/networking/phy.rst
@@ -333,6 +333,13 @@ Some of the interface modes are described below:
SerDes lane, each port having speeds of 2.5G / 1G / 100M / 10M achieved
through symbol replication. The PCS expects the standard USXGMII code word.
+``PHY_INTERFACE_MODE_MIILITE``
+ Non-standard, simplified MII mode, without TXER, RXER, CRS and COL signals
+ as defined for the MII. The absence of COL signal makes half-duplex link
+ modes impossible but does not interfere with BroadR-Reach link modes on
+ Broadcom (and other two-wire Ethernet) PHYs, because they are full-duplex
+ only.
+
Pause frames / flow control
===========================