1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
19  * arc_mdio_complete_wait - Waits until MDIO transaction is completed.
22  * returns:	0 on success, -ETIMEDOUT on a timeout.
34 			/* Reset "MDIO complete" flag */  in arc_mdio_complete_wait()
42 	return -ETIMEDOUT;  in arc_mdio_complete_wait()
46  * arc_mdio_read - MDIO interface read function.
48  * @phy_addr:	Address of the PHY device.
49  * @reg_num:	PHY register to read.
51  * returns:	The register contents on success, -ETIMEDOUT on a timeout.
53  * Reads the contents of the requested register from the requested PHY
58 	struct arc_emac_priv *priv = bus->priv;  in arc_mdio_read()
71 	dev_dbg(priv->dev, "arc_mdio_read(phy_addr=%i, reg_num=%x) = %x\n",  in arc_mdio_read()
78  * arc_mdio_write - MDIO interface write function.
80  * @phy_addr:	Address of the PHY device.
81  * @reg_num:	PHY register to write to.
84  * returns:	0 on success, -ETIMEDOUT on a timeout.
91 	struct arc_emac_priv *priv = bus->priv;  in arc_mdio_write()
93 	dev_dbg(priv->dev,  in arc_mdio_write()
106  * Description: reset the MII bus
110 	struct arc_emac_priv *priv = bus->priv;  in arc_mdio_reset()
111 	struct arc_emac_mdio_bus_data *data = &priv->bus_data;  in arc_mdio_reset()
113 	if (data->reset_gpio) {  in arc_mdio_reset()
114 		gpiod_set_value_cansleep(data->reset_gpio, 1);  in arc_mdio_reset()
115 		msleep(data->msec);  in arc_mdio_reset()
116 		gpiod_set_value_cansleep(data->reset_gpio, 0);  in arc_mdio_reset()
123  * arc_mdio_probe - MDIO probe function.
126  * returns:	0 on success, -ENOMEM when mdiobus_alloc
133 	struct arc_emac_mdio_bus_data *data = &priv->bus_data;  in arc_mdio_probe()
134 	struct device_node *np = priv->dev->of_node;  in arc_mdio_probe()
142 		return -ENOMEM;  in arc_mdio_probe()
144 	priv->bus = bus;  in arc_mdio_probe()
145 	bus->priv = priv;  in arc_mdio_probe()
146 	bus->parent = priv->dev;  in arc_mdio_probe()
147 	bus->name = name;  in arc_mdio_probe()
148 	bus->read = &arc_mdio_read;  in arc_mdio_probe()
149 	bus->write = &arc_mdio_write;  in arc_mdio_probe()
150 	bus->reset = &arc_mdio_reset;  in arc_mdio_probe()
152 	/* optional reset-related properties */  in arc_mdio_probe()
153 	data->reset_gpio = devm_gpiod_get_optional(priv->dev, "phy-reset",  in arc_mdio_probe()
155 	if (IS_ERR(data->reset_gpio)) {  in arc_mdio_probe()
157 		return dev_err_probe(priv->dev, PTR_ERR(data->reset_gpio),  in arc_mdio_probe()
161 	of_property_read_u32(np, "phy-reset-duration", &data->msec);  in arc_mdio_probe()
162 	/* A sane reset duration should not be longer than 1s */  in arc_mdio_probe()
163 	if (data->msec > 1000)  in arc_mdio_probe()
164 		data->msec = 1;  in arc_mdio_probe()
166 	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", bus->name);  in arc_mdio_probe()
177 		return dev_err_probe(priv->dev, error,  in arc_mdio_probe()
185  * arc_mdio_remove - MDIO remove function.
192 	mdiobus_unregister(priv->bus);  in arc_mdio_remove()
193 	mdiobus_free(priv->bus);  in arc_mdio_remove()
194 	priv->bus = NULL;  in arc_mdio_remove()