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net: phy: c45: add genphy_c45_pma_soft_reset()

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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: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Signed-off-by: Javen Xu <javen_xu@realsil.com.cn>
Link: https://patch.msgid.link/20260728073106.1515-2-javen_xu@realsil.com.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Javen Xu
2026-07-28 15:31:02 +08:00
committed by Jakub Kicinski
parent 1327e30657
commit 3b63c19e64
2 changed files with 23 additions and 0 deletions
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22
drivers/net/phy/phy-c45.c
View File

@@ -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_pma_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_pma_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_pma_soft_reset);
/**
* genphy_c45_aneg_done - return auto-negotiation complete status
* @phydev: target phy_device struct

1
include/linux/phy.h
View File

@@ -2317,6 +2317,7 @@ 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_pma_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);