v4.19.13 snapshot.
diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c
new file mode 100644
index 0000000..bc90764
--- /dev/null
+++ b/drivers/net/phy/mdio-mux-gpio.c
@@ -0,0 +1,109 @@
+/*
+ * 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) 2011, 2012 Cavium, Inc.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/of_mdio.h>
+#include <linux/module.h>
+#include <linux/phy.h>
+#include <linux/mdio-mux.h>
+#include <linux/gpio/consumer.h>
+
+#define DRV_VERSION "1.1"
+#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
+
+struct mdio_mux_gpio_state {
+ struct gpio_descs *gpios;
+ void *mux_handle;
+ int values[];
+};
+
+static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
+ void *data)
+{
+ struct mdio_mux_gpio_state *s = data;
+ unsigned int n;
+
+ if (current_child == desired_child)
+ return 0;
+
+ for (n = 0; n < s->gpios->ndescs; n++)
+ s->values[n] = (desired_child >> n) & 1;
+
+ gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
+ s->values);
+
+ return 0;
+}
+
+static int mdio_mux_gpio_probe(struct platform_device *pdev)
+{
+ struct mdio_mux_gpio_state *s;
+ struct gpio_descs *gpios;
+ int r;
+
+ gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
+ if (IS_ERR(gpios))
+ return PTR_ERR(gpios);
+
+ s = devm_kzalloc(&pdev->dev, struct_size(s, values, gpios->ndescs),
+ GFP_KERNEL);
+ if (!s) {
+ gpiod_put_array(gpios);
+ return -ENOMEM;
+ }
+
+ s->gpios = gpios;
+
+ r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
+ mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
+
+ if (r != 0) {
+ gpiod_put_array(s->gpios);
+ return r;
+ }
+
+ pdev->dev.platform_data = s;
+ return 0;
+}
+
+static int mdio_mux_gpio_remove(struct platform_device *pdev)
+{
+ struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
+ mdio_mux_uninit(s->mux_handle);
+ gpiod_put_array(s->gpios);
+ return 0;
+}
+
+static const struct of_device_id mdio_mux_gpio_match[] = {
+ {
+ .compatible = "mdio-mux-gpio",
+ },
+ {
+ /* Legacy compatible property. */
+ .compatible = "cavium,mdio-mux-sn74cbtlv3253",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
+
+static struct platform_driver mdio_mux_gpio_driver = {
+ .driver = {
+ .name = "mdio-mux-gpio",
+ .of_match_table = mdio_mux_gpio_match,
+ },
+ .probe = mdio_mux_gpio_probe,
+ .remove = mdio_mux_gpio_remove,
+};
+
+module_platform_driver(mdio_mux_gpio_driver);
+
+MODULE_DESCRIPTION(DRV_DESCRIPTION);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("David Daney");
+MODULE_LICENSE("GPL");