phy: micrel: add Microchip KSZ 9477 Switch PHY support

Adding Microchip 9477 Phy included in KSZ9477 Switch.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Woojung Huh <Woojung.Huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h
index f541da6..472fa4d 100644
--- a/include/linux/micrel_phy.h
+++ b/include/linux/micrel_phy.h
@@ -37,6 +37,8 @@
 
 #define PHY_ID_KSZ8795		0x00221550
 
+#define	PHY_ID_KSZ9477		0x00221631
+
 /* struct phy_device dev_flags definitions */
 #define MICREL_PHY_50MHZ_CLK	0x00000001
 #define MICREL_PHY_FXEN		0x00000002