// SPDX-License-Identifier: GPL-2.0+ /* Driver for Asix PHYs * * Author: Michael Schmitz <schmitzmic@gmail.com> */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/module.h> #include <linux/mii.h> #include <linux/phy.h> #define PHY_ID_ASIX_AX88796B 0x003b1841 MODULE_DESCRIPTION("Asix PHY driver"); MODULE_AUTHOR("Michael Schmitz <schmitzmic@gmail.com>"); MODULE_LICENSE("GPL"); /** * asix_soft_reset - software reset the PHY via BMCR_RESET bit * @phydev: target phy_device struct * * Description: Perform a software PHY reset using the standard * BMCR_RESET bit and poll for the reset bit to be cleared. * Toggle BMCR_RESET bit off to accommodate broken AX8796B PHY implementation * such as used on the Individual Computers' X-Surf 100 Zorro card. * * Returns: 0 on success, < 0 on failure */ static int asix_soft_reset(struct phy_device *phydev) { int ret; /* Asix PHY won't reset unless reset bit toggles */ ret = phy_write(phydev, MII_BMCR, 0); if (ret < 0) return ret; return genphy_soft_reset(phydev); } static struct phy_driver asix_driver[] = { { .phy_id = PHY_ID_ASIX_AX88796B, .name = "Asix Electronics AX88796B", .phy_id_mask = 0xfffffff0, /* PHY_BASIC_FEATURES */ .soft_reset = asix_soft_reset, } }; module_phy_driver(asix_driver); static struct mdio_device_id __maybe_unused asix_tbl[] = { { PHY_ID_ASIX_AX88796B, 0xfffffff0 }, { } }; MODULE_DEVICE_TABLE(mdio, asix_tbl);