v4.19.13 snapshot.
diff --git a/drivers/net/phy/mdio-octeon.c b/drivers/net/phy/mdio-octeon.c
new file mode 100644
index 0000000..ab6914f
--- /dev/null
+++ b/drivers/net/phy/mdio-octeon.c
@@ -0,0 +1,125 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2009-2015 Cavium, Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_mdio.h>
+#include <linux/module.h>
+#include <linux/gfp.h>
+#include <linux/phy.h>
+#include <linux/io.h>
+
+#include "mdio-cavium.h"
+
+static int octeon_mdiobus_probe(struct platform_device *pdev)
+{
+ struct cavium_mdiobus *bus;
+ struct mii_bus *mii_bus;
+ struct resource *res_mem;
+ resource_size_t mdio_phys;
+ resource_size_t regsize;
+ union cvmx_smix_en smi_en;
+ int err = -ENOENT;
+
+ mii_bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*bus));
+ if (!mii_bus)
+ return -ENOMEM;
+
+ res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res_mem == NULL) {
+ dev_err(&pdev->dev, "found no memory resource\n");
+ return -ENXIO;
+ }
+
+ bus = mii_bus->priv;
+ bus->mii_bus = mii_bus;
+ mdio_phys = res_mem->start;
+ regsize = resource_size(res_mem);
+
+ if (!devm_request_mem_region(&pdev->dev, mdio_phys, regsize,
+ res_mem->name)) {
+ dev_err(&pdev->dev, "request_mem_region failed\n");
+ return -ENXIO;
+ }
+
+ bus->register_base =
+ (u64)devm_ioremap(&pdev->dev, mdio_phys, regsize);
+ if (!bus->register_base) {
+ dev_err(&pdev->dev, "dev_ioremap failed\n");
+ return -ENOMEM;
+ }
+
+ smi_en.u64 = 0;
+ smi_en.s.en = 1;
+ oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+
+ bus->mii_bus->name = KBUILD_MODNAME;
+ snprintf(bus->mii_bus->id, MII_BUS_ID_SIZE, "%llx", bus->register_base);
+ bus->mii_bus->parent = &pdev->dev;
+
+ bus->mii_bus->read = cavium_mdiobus_read;
+ bus->mii_bus->write = cavium_mdiobus_write;
+
+ platform_set_drvdata(pdev, bus);
+
+ err = of_mdiobus_register(bus->mii_bus, pdev->dev.of_node);
+ if (err)
+ goto fail_register;
+
+ dev_info(&pdev->dev, "Probed\n");
+
+ return 0;
+fail_register:
+ mdiobus_free(bus->mii_bus);
+ smi_en.u64 = 0;
+ oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+ return err;
+}
+
+static int octeon_mdiobus_remove(struct platform_device *pdev)
+{
+ struct cavium_mdiobus *bus;
+ union cvmx_smix_en smi_en;
+
+ bus = platform_get_drvdata(pdev);
+
+ mdiobus_unregister(bus->mii_bus);
+ mdiobus_free(bus->mii_bus);
+ smi_en.u64 = 0;
+ oct_mdio_writeq(smi_en.u64, bus->register_base + SMI_EN);
+ return 0;
+}
+
+static const struct of_device_id octeon_mdiobus_match[] = {
+ {
+ .compatible = "cavium,octeon-3860-mdio",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, octeon_mdiobus_match);
+
+static struct platform_driver octeon_mdiobus_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = octeon_mdiobus_match,
+ },
+ .probe = octeon_mdiobus_probe,
+ .remove = octeon_mdiobus_remove,
+};
+
+void octeon_mdiobus_force_mod_depencency(void)
+{
+ /* Let ethernet drivers force us to be loaded. */
+}
+EXPORT_SYMBOL(octeon_mdiobus_force_mod_depencency);
+
+module_platform_driver(octeon_mdiobus_driver);
+
+MODULE_DESCRIPTION("Cavium OCTEON MDIO bus driver");
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");