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net: phy: micrel: add coma mode GPIO

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The LAN8814 has a coma mode pin which puts the PHY into isolate and
power-dowm mode. Unfortunately, the mode cannot be disabled by a
register. Usually, the input pin has a pull-up and connected to a GPIO
which can then be used to disable the mode. Try to get the GPIO and
deassert it.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michael Walle 2022-04-27 23:44:06 +02:00 committed by Jakub Kicinski
parent 31d00ca4ce
commit 738871b092
1 changed files with 20 additions and 0 deletions
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20
drivers/net/phy/micrel.c
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@ -32,6 +32,7 @@
#include <linux/ptp_clock.h>
#include <linux/ptp_classify.h>
#include <linux/net_tstamp.h>
#include <linux/gpio/consumer.h>
/* Operation Mode Strap Override */
#define MII_KSZPHY_OMSO 0x16
@ -2837,6 +2838,21 @@ static int lan8814_config_init(struct phy_device *phydev)
return 0;
}
static int lan8814_release_coma_mode(struct phy_device *phydev)
{
struct gpio_desc *gpiod;
gpiod = devm_gpiod_get_optional(&phydev->mdio.dev, "coma-mode",
GPIOD_OUT_HIGH_OPEN_DRAIN);
if (IS_ERR(gpiod))
return PTR_ERR(gpiod);
gpiod_set_consumer_name(gpiod, "LAN8814 coma mode");
gpiod_set_value_cansleep(gpiod, 0);
return 0;
}
static int lan8814_probe(struct phy_device *phydev)
{
struct kszphy_priv *priv;
@ -2859,6 +2875,10 @@ static int lan8814_probe(struct phy_device *phydev)
addr, sizeof(struct lan8814_shared_priv));
if (phy_package_init_once(phydev)) {
err = lan8814_release_coma_mode(phydev);
if (err)
return err;
err = lan8814_ptp_probe_once(phydev);
if (err)
return err;