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Commit 1bddd96c authored by Caesar Wang's avatar Caesar Wang Committed by David S. Miller
Browse files

net: arc_emac: support the phy reset for emac driver 



This patch adds to support the emac phy reset.

Different boards may require different phy reset duration. Add property
phy-reset-duration for emac driver, so that the boards that need
a longer reset duration can specify it in their device tree.

Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Signed-off-by: default avatarCaesar Wang <wxt@rock-chips.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: Alexander Kochetkov <al.kochet@gmail.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8700eee6

drivers/net/ethernet/arc/emac.h

+6 −0
Original line number Diff line number Diff line
@@ -102,6 +102,11 @@ struct buffer_state { 
	DEFINE_DMA_UNMAP_LEN(len);

};



struct arc_emac_mdio_bus_data {

	struct gpio_desc *reset_gpio;

	int msec;

};



/**

 * struct arc_emac_priv - Storage of EMAC's private information.

 * @dev:	Pointer to the current device.
@@ -131,6 +136,7 @@ struct arc_emac_priv { 
	struct device *dev;

	struct phy_device *phy_dev;

	struct mii_bus *bus;

	struct arc_emac_mdio_bus_data bus_data;



	void __iomem *regs;

	struct clk *clk;

drivers/net/ethernet/arc/emac_mdio.c

+37 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ 
#include <linux/delay.h>

#include <linux/of_mdio.h>

#include <linux/platform_device.h>

#include <linux/gpio/consumer.h>



#include "emac.h"
@@ -98,6 +99,25 @@ static int arc_mdio_write(struct mii_bus *bus, int phy_addr, 
	return arc_mdio_complete_wait(priv);

}



/**

 * arc_mdio_reset

 * @bus: points to the mii_bus structure

 * Description: reset the MII bus

 */

int arc_mdio_reset(struct mii_bus *bus)

{

	struct arc_emac_priv *priv = bus->priv;

	struct arc_emac_mdio_bus_data *data = &priv->bus_data;



	if (data->reset_gpio) {

		gpiod_set_value_cansleep(data->reset_gpio, 1);

		msleep(data->msec);

		gpiod_set_value_cansleep(data->reset_gpio, 0);

	}



	return 0;

}



/**

 * arc_mdio_probe - MDIO probe function.

 * @priv:	Pointer to ARC EMAC private data structure.
@@ -109,6 +129,8 @@ static int arc_mdio_write(struct mii_bus *bus, int phy_addr, 
 */

int arc_mdio_probe(struct arc_emac_priv *priv)

{

	struct arc_emac_mdio_bus_data *data = &priv->bus_data;

	struct device_node *np = priv->dev->of_node;

	struct mii_bus *bus;

	int error;
@@ -122,6 +144,21 @@ int arc_mdio_probe(struct arc_emac_priv *priv) 
	bus->name = "Synopsys MII Bus",

	bus->read = &arc_mdio_read;

	bus->write = &arc_mdio_write;

	bus->reset = &arc_mdio_reset;



	/* optional reset-related properties */

	data->reset_gpio = devm_gpiod_get_optional(priv->dev, "phy-reset",

						   GPIOD_OUT_LOW);

	if (IS_ERR(data->reset_gpio)) {

		error = PTR_ERR(data->reset_gpio);

		dev_err(priv->dev, "Failed to request gpio: %d\n", error);

		return error;

	}



	of_property_read_u32(np, "phy-reset-duration", &data->msec);

	/* A sane reset duration should not be longer than 1s */

	if (data->msec > 1000)

		data->msec = 1;



	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", bus->name);