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net: arc_emac: support the phy reset for emac driver

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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: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Caesar 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: David S. Miller <davem@davemloft.net>
This commit is contained in:
Caesar Wang 2016-03-14 16:01:54 +08:00 committed by David S. Miller
parent 8700eee627
commit 1bddd96cba
2 changed files with 43 additions and 0 deletions
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6
drivers/net/ethernet/arc/emac.h
View File

@ -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;

37
drivers/net/ethernet/arc/emac_mdio.c
View File

@ -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);