genphy_c37_config_aneg(9)

💖 genphy_c37_config_aneg(9) 💖

okay so bestie, welcome to the Kernel API Manual — today's main character is genphy_c37_config_aneg, and honestly? she's a tiny function with a very specific job. let's get into it 🎀

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✨ NAME ✨

genphy_c37_config_aneg — restart auto-negotiation, or write the BMCR. that's it, that's the whole vibe 💅

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🌸 SYNOPSIS 🌸

int genphy_c37_config_aneg (struct phy_device *phydev );

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🦋 ARGUMENTS 🦋

• phydev — the target phy_device struct. she's your girl, your little PHY device bestie, the one you're configuring 🫶

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💜 DESCRIPTION 💜

so here's the tea, and it's genuinely simple:

• if auto-negotiation is enabled, we configure the advertising first, and then we restart auto-negotiation. like, set up what she's gonna advertise, then hit the restart button ✨
• if auto-negotiation is not enabled, then we write the BMCR instead. different lane, same destination 💫

heads up: this function is intended for use with Clause 37 1000Base-X mode. she's purpose-built, not a generalist. respect her niche 🔥

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👑 SEE ALSO 👑

the whole friend group, no cap — literally every single one of these icons is down there, and yes bestie you're getting all of them 🍓

• phy_uses_state_machine(9)
• phy_register_fixup(9)
• genphy_match_phy_device(9)
• get_phy_c45_ids(9)
• get_phy_c22_id(9)
• get_phy_device(9)
• phy_device_register(9)
• phy_device_remove(9)
• phy_get_c45_ids(9)
• phy_find_next(9)
• phy_prepare_link(9)
• phy_connect_direct(9)
• phy_connect(9)
• phy_disconnect(9)
• phy_poll_reset(9)
• phy_sfp_connect_phy(9)
• phy_sfp_disconnect_phy(9)
• phy_sfp_attach(9)
• phy_sfp_detach(9)
• phy_sfp_probe(9)
• phy_attach_direct(9)
• phy_detach(9)
• phy_reset_after_clk_enable(9)
• genphy_config_advert(9)
• genphy_c37_config_advert(9)
• genphy_setup_forced(9)
• genphy_restart_aneg(9)
• genphy_check_and_restart_aneg(9)
• __genphy_config_aneg(9)
• genphy_aneg_done(9)
• genphy_update_link(9)
• genphy_read_status_fixed(9)
• genphy_read_status(9)
• genphy_c37_read_status(9)
• genphy_soft_reset(9)
• genphy_read_abilities(9)
• phy_remove_link_mode(9)
• phy_advertise_supported(9)
• phy_advertise_eee_all(9)
• phy_support_eee(9)
• phy_disable_eee(9)
• phy_support_sym_pause(9)
• phy_support_asym_pause(9)
• phy_set_sym_pause(9)
• phy_set_asym_pause(9)
• phy_validate_pause(9)
• phy_get_pause(9)
• phy_get_internal_delay(9)
• phy_get_tx_amplitude_gain(9)
• phy_get_mac_termination(9)
• phy_get_sfp_port(9)
• fwnode_mdio_find_device(9)
• fwnode_phy_find_device(9)
• fwnode_get_phy_node(9)
• phy_probe(9)
• phy_driver_register(9)

and one more lil detail — these all live in the kernel file ./drivers/net/phy/phy_device.c, so that's your source of truth, iykyk 🌈

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okay that's the whole page bestie, you ate that 💅✨

this masterpiece came from ./drivers/net/phy, dated October 2026, and if you need to cite her (you will), she goes by genphy_c37_config_aneg(9) — iconic, unforgettable, periodt 👑🦋💖