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Date:	Tue, 15 Apr 2014 15:50:19 +0200
From:	Thomas Petazzoni <>
To:	"David S. Miller" <>
	Jason Cooper <>,
	Andrew Lunn <>,
	Sebastian Hesselbarth <>,
	Gregory Clement <>,
	Tawfik Bayouk <>,
	Nadav Haklai <>,
	Lior Amsalem <>,
	Dmitri Epshtein <>,
	Ezequiel Garcia <>,
	George Joseph <>,,
	Willy Tarreau <>,
	Alexander Reuter <>,
Subject: [PATCH 1/3] 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,
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 <>
 Documentation/devicetree/bindings/net/ethernet.txt | 2 +-
 include/linux/phy.h                                | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/ethernet.txt b/Documentation/devicetree/bindings/net/ethernet.txt
index 9ecd43d..3fc3605 100644
--- a/Documentation/devicetree/bindings/net/ethernet.txt
+++ b/Documentation/devicetree/bindings/net/ethernet.txt
@@ -10,7 +10,7 @@ The following properties are common to the Ethernet controllers:
 - max-frame-size: number, maximum transfer unit (IEEE defined MTU), rather than
   the maximum frame size (there's contradiction in ePAPR).
 - phy-mode: string, operation mode of the PHY interface; supported values are
-  "mii", "gmii", "sgmii", "tbi", "rev-mii", "rmii", "rgmii", "rgmii-id",
+  "mii", "gmii", "sgmii", "qsgmii", "tbi", "rev-mii", "rmii", "rgmii", "rgmii-id",
   "rgmii-rxid", "rgmii-txid", "rtbi", "smii", "xgmii"; this is now a de-facto
   standard property;
 - phy-connection-type: the same as "phy-mode" property but described in ePAPR;
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 @@ typedef enum {
 } phy_interface_t;
@@ -116,6 +117,8 @@ static inline const char *phy_modes(phy_interface_t interface)
 		return "xgmii";
 		return "moca";
+		return "qsgmii";
 		return "unknown";

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