The "reverse SGMII" protocol name is a personal invention, derived from
"reverse MII" and "reverse RMII", this means: "behave like an SGMII
PHY".

Signed-off-by: David Yang <mmyangfl@gmail.com>
---
 include/linux/phy.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 7da9e19471c9..42d5c1f4d8ad 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -107,6 +107,7 @@ extern const int phy_basic_ports_array[3];
  * @PHY_INTERFACE_MODE_LAUI: 50 Gigabit Attachment Unit Interface
  * @PHY_INTERFACE_MODE_100GBASEP: 100GBase-P - with Clause 134 FEC
  * @PHY_INTERFACE_MODE_MIILITE: MII-Lite - MII without RXER TXER CRS COL
+ * @PHY_INTERFACE_MODE_REVSGMII: Serial gigabit media-independent interface in PHY role
  * @PHY_INTERFACE_MODE_MAX: Book keeping
  *
  * Describes the interface between the MAC and PHY.
@@ -152,6 +153,7 @@ typedef enum {
 	PHY_INTERFACE_MODE_LAUI,
 	PHY_INTERFACE_MODE_100GBASEP,
 	PHY_INTERFACE_MODE_MIILITE,
+	PHY_INTERFACE_MODE_REVSGMII,
 	PHY_INTERFACE_MODE_MAX,
 } phy_interface_t;
 
@@ -281,6 +283,8 @@ static inline const char *phy_modes(phy_interface_t interface)
 		return "100gbase-p";
 	case PHY_INTERFACE_MODE_MIILITE:
 		return "mii-lite";
+	case PHY_INTERFACE_MODE_REVSGMII:
+		return "rev-sgmii";
 	default:
 		return "unknown";
 	}
-- 
2.51.0