[2/9] phylib: rework to prepare for OF registration of PHYs

From: Grant Likely <grant.likely@secretlab.ca>

This patch makes changes in preparation for supporting open firmware
device tree descriptions of MDIO busses.  Changes include:
- Cleanup handling of phy_map[] entries; they are already NULLed when
  registering and so don't need to be re-cleared, and it is good practice
  to clear them out when unregistering.
- Split phy_device registration out into a new function so that the
  OF helpers can do two stage registration (separate allocation and
  registration steps).

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
CC: linuxppc-dev@ozlabs.org
CC: netdev@vger.kernel.org
CC: Andy Fleming <afleming@freescale.com>
---

 drivers/net/phy/mdio_bus.c   |   29 +++-------------------------
 drivers/net/phy/phy_device.c |   43 ++++++++++++++++++++++++++++++++++++++----
 include/linux/phy.h          |    1 +
 3 files changed, 43 insertions(+), 30 deletions(-)



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RFC, please don't apply yet.

On Wed, Mar 18, 2009 at 11:00 PM, Grant Likely
<grant.likely@secretlab.ca> wrote:
> From: Grant Likely <grant.likely@secretlab.ca>
>
> This patch makes changes in preparation for supporting open firmware
> device tree descriptions of MDIO busses.  Changes include:
> - Cleanup handling of phy_map[] entries; they are already NULLed when
>  registering and so don't need to be re-cleared, and it is good practice
>  to clear them out when unregistering.
> - Split phy_device registration out into a new function so that the
>  OF helpers can do two stage registration (separate allocation and
>  registration steps).
>
> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
> CC: linuxppc-dev@ozlabs.org
> CC: netdev@vger.kernel.org
> CC: Andy Fleming <afleming@freescale.com>
> ---
>
>  drivers/net/phy/mdio_bus.c   |   29 +++-------------------------
>  drivers/net/phy/phy_device.c |   43 ++++++++++++++++++++++++++++++++++++++----
>  include/linux/phy.h          |    1 +
>  3 files changed, 43 insertions(+), 30 deletions(-)
>
>
> diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> index 811a637..3c39c7b 100644
> --- a/drivers/net/phy/mdio_bus.c
> +++ b/drivers/net/phy/mdio_bus.c
> @@ -112,7 +112,6 @@ int mdiobus_register(struct mii_bus *bus)
>                bus->reset(bus);
>
>        for (i = 0; i < PHY_MAX_ADDR; i++) {
> -               bus->phy_map[i] = NULL;
>                if ((bus->phy_mask & (1 << i)) == 0) {
>                        struct phy_device *phydev;
>
> @@ -149,6 +148,7 @@ void mdiobus_unregister(struct mii_bus *bus)
>        for (i = 0; i < PHY_MAX_ADDR; i++) {
>                if (bus->phy_map[i])
>                        device_unregister(&bus->phy_map[i]->dev);
> +               bus->phy_map[i] = NULL;
>        }
>  }
>  EXPORT_SYMBOL(mdiobus_unregister);
> @@ -187,35 +187,12 @@ struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
>        if (IS_ERR(phydev) || phydev == NULL)
>                return phydev;
>
> -       /* There's a PHY at this address
> -        * We need to set:
> -        * 1) IRQ
> -        * 2) bus_id
> -        * 3) parent
> -        * 4) bus
> -        * 5) mii_bus
> -        * And, we need to register it */
> -
> -       phydev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
> -
> -       phydev->dev.parent = bus->parent;
> -       phydev->dev.bus = &mdio_bus_type;
> -       dev_set_name(&phydev->dev, PHY_ID_FMT, bus->id, addr);
> -
> -       phydev->bus = bus;
> -
> -       /* Run all of the fixups for this PHY */
> -       phy_scan_fixups(phydev);
> -
> -       err = device_register(&phydev->dev);
> +       err = phy_device_register(phydev);
>        if (err) {
> -               printk(KERN_ERR "phy %d failed to register\n", addr);
>                phy_device_free(phydev);
> -               phydev = NULL;
> +               return NULL;
>        }
>
> -       bus->phy_map[addr] = phydev;
> -
>        return phydev;
>  }
>  EXPORT_SYMBOL(mdiobus_scan);
> diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> index 0a06e4f..793332f 100644
> --- a/drivers/net/phy/phy_device.c
> +++ b/drivers/net/phy/phy_device.c
> @@ -39,10 +39,6 @@ MODULE_DESCRIPTION("PHY library");
>  MODULE_AUTHOR("Andy Fleming");
>  MODULE_LICENSE("GPL");
>
> -static struct phy_driver genphy_driver;
> -extern int mdio_bus_init(void);
> -extern void mdio_bus_exit(void);
> -
>  void phy_device_free(struct phy_device *phydev)
>  {
>        kfree(phydev);
> @@ -53,6 +49,10 @@ static void phy_device_release(struct device *dev)
>        phy_device_free(to_phy_device(dev));
>  }
>
> +static struct phy_driver genphy_driver;
> +extern int mdio_bus_init(void);
> +extern void mdio_bus_exit(void);
> +
>  static LIST_HEAD(phy_fixup_list);
>  static DEFINE_MUTEX(phy_fixup_lock);
>
> @@ -166,6 +166,10 @@ struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
>        dev->addr = addr;
>        dev->phy_id = phy_id;
>        dev->bus = bus;
> +       dev->dev.parent = bus->parent;
> +       dev->dev.bus = &mdio_bus_type;
> +       dev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
> +       dev_set_name(&dev->dev, PHY_ID_FMT, bus->id, addr);
>
>        dev->state = PHY_DOWN;
>
> @@ -237,6 +241,37 @@ struct phy_device * get_phy_device(struct mii_bus *bus, int addr)
>  }
>
>  /**
> + * phy_device_register - Register the phy device on the MDIO bus
> + * @phy_device: phy_device structure to be added to the MDIO bus
> + */
> +int phy_device_register(struct phy_device *phydev)
> +{
> +       int err;
> +
> +       /* Don't register a phy if one is already registered at this
> +        * address */
> +       if (phydev->bus->phy_map[phydev->addr])
> +               return -EINVAL;
> +       phydev->bus->phy_map[phydev->addr] = phydev;
> +
> +       /* Run all of the fixups for this PHY */
> +       phy_scan_fixups(phydev);
> +
> +       err = device_register(&phydev->dev);
> +       if (err) {
> +               pr_err("phy %d failed to register\n", phydev->addr);
> +               goto out;
> +       }
> +
> +       return 0;
> +
> + out:
> +       phydev->bus->phy_map[phydev->addr] = NULL;
> +       return err;
> +}
> +EXPORT_SYMBOL(phy_device_register);
> +
> +/**
>  * phy_prepare_link - prepares the PHY layer to monitor link status
>  * @phydev: target phy_device struct
>  * @handler: callback function for link status change notifications
> diff --git a/include/linux/phy.h b/include/linux/phy.h
> index d7e54d9..a47d64f 100644
> --- a/include/linux/phy.h
> +++ b/include/linux/phy.h
> @@ -439,6 +439,7 @@ static inline int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
>
>  int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);
>  struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
> +int phy_device_register(struct phy_device *phy);
>  int phy_clear_interrupt(struct phy_device *phydev);
>  int phy_config_interrupt(struct phy_device *phydev, u32 interrupts);
>  struct phy_device * phy_attach(struct net_device *dev,
>
>