1 files changed, 63 insertions, 0 deletions

diff --git a/drivers/net/phy/asix.c b/drivers/net/phy/asix.c
new file mode 100644
index 000000000000..8ebe7f5484ae
--- /dev/null
+++ b/drivers/net/phy/asix.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Driver for Asix PHYs
+ *
+ * Author: Michael Schmitz <schmitzmic@gmail.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+#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,
+        .features       = 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);