net: phy: add minimal support for QSGMII PHY
This commit adds the necessary definitions for the PHY layer to
recognize "qsgmii" as a valid PHY interface. A QSMII interface, as
defined at
http://en.wikipedia.org/wiki/Media_Independent_Interface#Quad_Serial_Gigabit_Media_Independent_Interface,
is "is a method of combining four SGMII lines into a 5Gbit/s
interface. QSGMII, like SGMII, uses LVDS signalling for the TX and RX
data and a single LVDS clock signal. QSGMII uses significantly fewer
signal lines than four SGMII busses."
This type of MAC <-> PHY connection might require special handling on
the MAC driver side, so it should be possible to express this type of
MAC <-> PHY connection, for example in the Device Tree.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: devicetree@vger.kernel.org
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 24126c4..4d0221f 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -75,6 +75,7 @@
PHY_INTERFACE_MODE_SMII,
PHY_INTERFACE_MODE_XGMII,
PHY_INTERFACE_MODE_MOCA,
+ PHY_INTERFACE_MODE_QSGMII,
PHY_INTERFACE_MODE_MAX,
} phy_interface_t;
@@ -116,6 +117,8 @@
return "xgmii";
case PHY_INTERFACE_MODE_MOCA:
return "moca";
+ case PHY_INTERFACE_MODE_QSGMII:
+ return "qsgmii";
default:
return "unknown";
}