sfp: add support for 100 base-x SFPs

Add support for 100Base-FX, 100Base-LX, 100Base-PX and 100Base-BX10 modules
This is needed for Sparx-5 switch.
Signed-off-by: Bjarni Jonasson <bjarni.jonasson@microchip.com>
Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/phy/sfp-bus.c

@@ -265,6 +265,12 @@ void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 	    br_min <= 1300 && br_max >= 1200)
 		phylink_set(modes, 1000baseX_Full);
 
+	/* 100Base-FX, 100Base-LX, 100Base-PX, 100Base-BX10 */
+	if (id->base.e100_base_fx || id->base.e100_base_lx)
+		phylink_set(modes, 100baseFX_Full);
+	if ((id->base.e_base_px || id->base.e_base_bx10) && br_nom == 100)
+		phylink_set(modes, 100baseFX_Full);
+
 	/* For active or passive cables, select the link modes
 	 * based on the bit rates and the cable compliance bytes.
 	 */
@@ -389,6 +395,9 @@ phy_interface_t sfp_select_interface(struct sfp_bus *bus,
 	if (phylink_test(link_modes, 1000baseX_Full))
 		return PHY_INTERFACE_MODE_1000BASEX;
 
+	if (phylink_test(link_modes, 100baseFX_Full))
+		return PHY_INTERFACE_MODE_100BASEX;
+
 	dev_warn(bus->sfp_dev, "Unable to ascertain link mode\n");
 
 	return PHY_INTERFACE_MODE_NA;