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net: sfp: add quirk for ZOERAX SFP-2.5G-T

This is a 2.5G copper module which appears to be based on a Motorcomm
YT8821 PHY. There doesn't seem to be a usable way to to access the PHY
(I2C address 0x56 provides only read-only C22 access, and Rollball is
also not working).

The module does not report the correct extended compliance code for
2.5GBase-T, and instead claims to support SONET OC-48 and Fibre Channel:

Identifier : 0x03 (SFP)
Extended identifier : 0x04 (GBIC/SFP defined by 2-wire interface ID)
Connector : 0x07 (LC)
Transceiver codes : 0x00 0x01 0x00 0x00 0x40 0x40 0x04 0x00 0x00
Transceiver type : FC: Multimode, 50um (M5)
Encoding : 0x05 (SONET Scrambled)
BR Nominal : 2500MBd

Despite this, the kernel still enables the correct 2500Base-X interface
mode. However, for the module to actually work, it is also necessary to
disable inband auto-negotiation.

Enable the existing "sfp_quirk_oem_2_5g" for this module, which handles
that and also sets the bit for 2500Base-T link mode.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/20260329191304.720160-1-jan@3e8.eu
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Jan Hoffmann and committed by
Jakub Kicinski 911e2c05 cf0d9080

+2
+2
drivers/net/phy/sfp.c
··· 567 567 SFP_QUIRK_F("Turris", "RTSFP-2.5G", sfp_fixup_rollball), 568 568 SFP_QUIRK_F("Turris", "RTSFP-10", sfp_fixup_rollball), 569 569 SFP_QUIRK_F("Turris", "RTSFP-10G", sfp_fixup_rollball), 570 + 571 + SFP_QUIRK_S("ZOERAX", "SFP-2.5G-T", sfp_quirk_oem_2_5g), 570 572 }; 571 573 572 574 static size_t sfp_strlen(const char *str, size_t maxlen)