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-rw-r--r--Documentation/networking/phy.rst4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/networking/phy.rst b/Documentation/networking/phy.rst
index b7ac4c64cf67..1283240d7620 100644
--- a/Documentation/networking/phy.rst
+++ b/Documentation/networking/phy.rst
@@ -323,6 +323,10 @@ Some of the interface modes are described below:
contrast with the 1000BASE-X phy mode used for Clause 38 and 39 PMDs, this
interface mode has different autonegotiation and only supports full duplex.
+``PHY_INTERFACE_MODE_PSGMII``
+ This is the Penta SGMII mode, it is similar to QSGMII but it combines 5
+ SGMII lines into a single link compared to 4 on QSGMII.
+
Pause frames / flow control
===========================