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net: phy: add support for reset-controller

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This commit adds support for PHY reset pins handled by a reset controller.

Signed-off-by: David Bauer <mail@david-bauer.net>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Bauer 2019-04-17 23:59:21 +02:00 committed by David S. Miller
parent b54dd90cab
commit 71dd6c0dff
3 changed files with 37 additions and 4 deletions
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27
drivers/net/phy/mdio_bus.c
View File

@ -24,6 +24,7 @@
#include <linux/of_gpio.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/reset.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
@ -57,8 +58,23 @@ static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
mdiodev->reset = gpiod;
/* Assert the reset signal again */
mdio_device_reset(mdiodev, 1);
return 0;
}
static int mdiobus_register_reset(struct mdio_device *mdiodev)
{
struct reset_control *reset = NULL;
if (mdiodev->dev.of_node)
reset = devm_reset_control_get_exclusive(&mdiodev->dev,
"phy");
if (PTR_ERR(reset) == -ENOENT ||
PTR_ERR(reset) == -ENOTSUPP)
reset = NULL;
else if (IS_ERR(reset))
return PTR_ERR(reset);
mdiodev->reset_ctrl = reset;
return 0;
}
@ -74,6 +90,13 @@ int mdiobus_register_device(struct mdio_device *mdiodev)
err = mdiobus_register_gpiod(mdiodev);
if (err)
return err;
err = mdiobus_register_reset(mdiodev);
if (err)
return err;
/* Assert the reset signal */
mdio_device_reset(mdiodev, 1);
}
mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;

13
drivers/net/phy/mdio_device.c
View File

@ -16,6 +16,7 @@
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/unistd.h>
@ -116,10 +117,18 @@ void mdio_device_reset(struct mdio_device *mdiodev, int value)
{
unsigned int d;
if (!mdiodev->reset)
if (!mdiodev->reset && !mdiodev->reset_ctrl)
return;
gpiod_set_value(mdiodev->reset, value);
if (mdiodev->reset)
gpiod_set_value(mdiodev->reset, value);
if (mdiodev->reset_ctrl) {
if (value)
reset_control_assert(mdiodev->reset_ctrl);
else
reset_control_deassert(mdiodev->reset_ctrl);
}
d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay;
if (d)

1
include/linux/mdio.h
View File

@ -40,6 +40,7 @@ struct mdio_device {
int addr;
int flags;
struct gpio_desc *reset;
struct reset_control *reset_ctrl;
unsigned int reset_assert_delay;
unsigned int reset_deassert_delay;
};