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net: phy: extend fixed driver with fixed_phy_register()

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The existing fixed_phy_add() function has several drawbacks that
prevents it from being used as is for OF-based declaration of fixed
PHYs:

 * The address of the PHY on the fake bus needs to be passed, while a
   dynamic allocation is desired.

 * Since the phy_device instantiation is post-poned until the next
   mdiobus scan, there is no way to associate the fixed PHY with its
   OF node, which later prevents of_phy_connect() from finding this
   fixed PHY from a given OF node.

To solve this, this commit introduces fixed_phy_register(), which will
allocate an available PHY address, add the PHY using fixed_phy_add()
and instantiate the phy_device structure associated with the provided
OF node.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Petazzoni 2014-05-16 16:14:04 +02:00 committed by David S. Miller
parent 9b74494229
commit a759512174
2 changed files with 72 additions and 0 deletions
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61
drivers/net/phy/fixed.c
View File

@ -21,6 +21,7 @@
#include <linux/phy_fixed.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
#define MII_REGS_NUM 29
@ -203,6 +204,66 @@ err_regs:
}
EXPORT_SYMBOL_GPL(fixed_phy_add);
void fixed_phy_del(int phy_addr)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
struct fixed_phy *fp, *tmp;
list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
if (fp->addr == phy_addr) {
list_del(&fp->node);
kfree(fp);
return;
}
}
}
EXPORT_SYMBOL_GPL(fixed_phy_del);
static int phy_fixed_addr;
static DEFINE_SPINLOCK(phy_fixed_addr_lock);
int fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
struct device_node *np)
{
struct fixed_mdio_bus *fmb = &platform_fmb;
struct phy_device *phy;
int phy_addr;
int ret;
/* Get the next available PHY address, up to PHY_MAX_ADDR */
spin_lock(&phy_fixed_addr_lock);
if (phy_fixed_addr == PHY_MAX_ADDR) {
spin_unlock(&phy_fixed_addr_lock);
return -ENOSPC;
}
phy_addr = phy_fixed_addr++;
spin_unlock(&phy_fixed_addr_lock);
ret = fixed_phy_add(PHY_POLL, phy_addr, status);
if (ret < 0)
return ret;
phy = get_phy_device(fmb->mii_bus, phy_addr, false);
if (!phy || IS_ERR(phy)) {
fixed_phy_del(phy_addr);
return -EINVAL;
}
of_node_get(np);
phy->dev.of_node = np;
ret = phy_device_register(phy);
if (ret) {
phy_device_free(phy);
of_node_put(np);
fixed_phy_del(phy_addr);
return ret;
}
return 0;
}
static int __init fixed_mdio_bus_init(void)
{
struct fixed_mdio_bus *fmb = &platform_fmb;

11
include/linux/phy_fixed.h
View File

@ -9,15 +9,26 @@ struct fixed_phy_status {
int asym_pause;
};
struct device_node;
#ifdef CONFIG_FIXED_PHY
extern int fixed_phy_add(unsigned int irq, int phy_id,
struct fixed_phy_status *status);
extern int fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
struct device_node *np);
#else
static inline int fixed_phy_add(unsigned int irq, int phy_id,
struct fixed_phy_status *status)
{
return -ENODEV;
}
static inline int fixed_phy_register(unsigned int irq,
struct fixed_phy_status *status,
struct device_node *np)
{
return -ENODEV;
}
#endif /* CONFIG_FIXED_PHY */
/*