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-rw-r--r--drivers/net/phy/ax88796b.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/net/phy/ax88796b.c b/drivers/net/phy/ax88796b.c
new file mode 100644
index 000000000000..79bf7ef1fcfd
--- /dev/null
+++ b/drivers/net/phy/ax88796b.c
@@ -0,0 +1,57 @@
+// 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);