net: phy: add interface mode PHY_INTERFACE_MODE_USXGMII

Add support for interface mode PHY_INTERFACE_MODE_USXGMII.

Signed-off-by: Heiner Kallweit <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/linux/phy.h

···
 	PHY_INTERFACE_MODE_XAUI,
 	/* 10GBASE-KR, XFI, SFI - single lane 10G Serdes */
 	PHY_INTERFACE_MODE_10GKR,
+	PHY_INTERFACE_MODE_USXGMII,
 	PHY_INTERFACE_MODE_MAX,
 } phy_interface_t;
 
···
 		return "xaui";
 	case PHY_INTERFACE_MODE_10GKR:
 		return "10gbase-kr";
+	case PHY_INTERFACE_MODE_USXGMII:
+		return "usxgmii";
 	default:
 		return "unknown";
 	}