[PATCH net-next] net: sfp: add quirk for OEM DFP-34X-2C2 GPON ONU SFP

[Sergio Palumbo]

     DFP-34X-2C2 is a GPON spf module working at both 1000baseX
     and 2500baseX.
     Setting the module to LAN_SDS_MODE=6 the module is working
     at 2500baseX with auto negotiation see at
     https://hack-gpon.org/ont-odi-realtek-dfp-34x-2c2/
     Unfortunatly the module's PHY is accessible at 1000baseX only.
     ethtool returning:
     Supported ports: [ Fibre ]
     Supported link modes: 1000baseX/Full

     After applying the quirk:
     Supported ports: [ Fibre ]
     Supported link modes: 1000baseX/Full
                           2500baseX/Full
     Tested on BANANA PI R3 in OpenWRT v 23.05.2 Kernel 5.15.137
     Tested on sfp to ethernet Media Converter.
     Autonegotiating 1000baseX or 2500baseX according to the
     connected host speed.

     This module is existing in 2 versions:
     Vendor = "ODI"
     Vendor = "OEM"
     This is the patch for vendor "OEM"

     Patch has been inserted keeping the list in alphabetical order
     first by vendor first and then by part string.

Signed-off-by: Sergio Palumbo <palumbo.ser@xxxxxxxxxx>
---
 drivers/net/phy/sfp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index f75c9eb3958e..3c0028a4af92 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -502,6 +502,9 @@ static const struct sfp_quirk sfp_quirks[] = {
 	SFP_QUIRK_F("Walsun", "HXSX-ATRC-1", sfp_fixup_fs_10gt),
 	SFP_QUIRK_F("Walsun", "HXSX-ATRI-1", sfp_fixup_fs_10gt),
 
+	// OEM DFP-34X-2C2 GPON ONU support 2500base-X
+	SFP_QUIRK_M("OEM", "DFP-34X-2C2", sfp_quirk_2500basex),
+
 	SFP_QUIRK_F("OEM", "SFP-10G-T", sfp_fixup_rollball_cc),
 	SFP_QUIRK_M("OEM", "SFP-2.5G-T", sfp_quirk_oem_2_5g),
 	SFP_QUIRK_F("OEM", "RTSFP-10", sfp_fixup_rollball_cc),
-- 
2.34.1