[PATCH net-next v7 1/4] net: phy: c45: add genphy_c45_soft_reset()
From: javen <hidden>
Date: 2026-06-29 06:49:06
Also in:
lkml
Subsystem:
ethernet phy library, networking drivers, the rest · Maintainers:
Andrew Lunn, Heiner Kallweit, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Javen Xu <redacted> Add a generic Clause 45 software reset helper. The helper sets the reset bit in the PMA/PMD control register and waits until the bit is cleared by hardware. Reviewed-by: Nicolai Buchwitz <redacted> Signed-off-by: Javen Xu <redacted> --- Changes in v2: - no changes, new file Changes in v3: - re-order function according to the order in phy-c45.c Changes in v4: - no changes Changes in v5: - no changes Changes in v6: - increase timeout to 600ms Changes in v7: - no changes --- drivers/net/phy/phy-c45.c | 22 ++++++++++++++++++++++ include/linux/phy.h | 1 + 2 files changed, 23 insertions(+)
diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
index 126951741428..60d044156a83 100644
--- a/drivers/net/phy/phy-c45.c
+++ b/drivers/net/phy/phy-c45.c@@ -384,6 +384,28 @@ int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart) } EXPORT_SYMBOL_GPL(genphy_c45_check_and_restart_aneg); +/** + * genphy_c45_soft_reset - software reset the PHY via Clause 45 PMA/PMD control register + * @phydev: target phy_device struct + * + * Return: 0 on success, negative errno on failure. + */ +int genphy_c45_soft_reset(struct phy_device *phydev) +{ + int ret, val; + + ret = phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, + MDIO_CTRL1_RESET); + if (ret < 0) + return ret; + + return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PMAPMD, + MDIO_CTRL1, val, + !(val & MDIO_CTRL1_RESET), + 5000, 600000, true); +} +EXPORT_SYMBOL_GPL(genphy_c45_soft_reset); + /** * genphy_c45_aneg_done - return auto-negotiation complete status * @phydev: target phy_device struct
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 199a7aaa341b..25a66320df56 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h@@ -2309,6 +2309,7 @@ int genphy_c37_read_status(struct phy_device *phydev, bool *changed); /* Clause 45 PHY */ int genphy_c45_restart_aneg(struct phy_device *phydev); int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart); +int genphy_c45_soft_reset(struct phy_device *phydev); int genphy_c45_aneg_done(struct phy_device *phydev); int genphy_c45_read_link(struct phy_device *phydev); int genphy_c45_read_lpa(struct phy_device *phydev);
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2.43.0