// 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);