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// 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);
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