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phy: fixed_phy: Add gpio to determine link up/down.

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An SFP module may have a link up/down status pin which can be
connection to a GPIO line of the host. Add support for reading such an
GPIO in the fixed_phy driver.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn
2015-08-31 15:56:53 +02:00
committed by David S. Miller
parent 8b59d19e74
commit a5597008db
9 changed files with 59 additions and 15 deletions
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26
drivers/net/phy/fixed_phy.c
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@@ -22,6 +22,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/gpio.h>
#define MII_REGS_NUM 29
@@ -38,6 +39,7 @@ struct fixed_phy {
struct fixed_phy_status status;
int (*link_update)(struct net_device *, struct fixed_phy_status *);
struct list_head node;
int link_gpio;
};
static struct platform_device *pdev;
@@ -52,6 +54,9 @@ static int fixed_phy_update_regs(struct fixed_phy *fp)
u16 lpagb = 0;
u16 lpa = 0;
if (gpio_is_valid(fp->link_gpio))
fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
if (!fp->status.link)
goto done;
bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;
@@ -215,7 +220,8 @@ int fixed_phy_update_state(struct phy_device *phydev,
EXPORT_SYMBOL(fixed_phy_update_state);
int fixed_phy_add(unsigned int irq, int phy_addr,
struct fixed_phy_status *status)
struct fixed_phy_status *status,
int link_gpio)
{
int ret;
struct fixed_mdio_bus *fmb = &platform_fmb;
@@ -231,15 +237,26 @@ int fixed_phy_add(unsigned int irq, int phy_addr,
fp->addr = phy_addr;
fp->status = *status;
fp->link_gpio = link_gpio;
if (gpio_is_valid(fp->link_gpio)) {
ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
"fixed-link-gpio-link");
if (ret)
goto err_regs;
}
ret = fixed_phy_update_regs(fp);
if (ret)
goto err_regs;
goto err_gpio;
list_add_tail(&fp->node, &fmb->phys);
return 0;
err_gpio:
if (gpio_is_valid(fp->link_gpio))
gpio_free(fp->link_gpio);
err_regs:
kfree(fp);
return ret;
@@ -254,6 +271,8 @@ void fixed_phy_del(int phy_addr)
list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
if (fp->addr == phy_addr) {
list_del(&fp->node);
if (gpio_is_valid(fp->link_gpio))
gpio_free(fp->link_gpio);
kfree(fp);
return;
}
@@ -266,6 +285,7 @@ static DEFINE_SPINLOCK(phy_fixed_addr_lock);
struct phy_device *fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
int link_gpio,
struct device_node *np)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
@@ -282,7 +302,7 @@ struct phy_device *fixed_phy_register(unsigned int irq,
phy_addr = phy_fixed_addr++;
spin_unlock(&phy_fixed_addr_lock);
ret = fixed_phy_add(PHY_POLL, phy_addr, status);
ret = fixed_phy_add(PHY_POLL, phy_addr, status, link_gpio);
if (ret < 0)
return ERR_PTR(ret);