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    Subject[PATCH v4 1/3] netdev/of/phy: New function: of_mdio_find_bus().
    Date
    From: David Daney <david.daney@cavium.com>

    Add of_mdio_find_bus() which allows an mii_bus to be located given its
    associated the device tree node.

    This is needed by the follow-on patch to add a driver for MDIO bus
    multiplexers.

    The of_mdiobus_register() function is modified so that the device tree
    node is recorded in the mii_bus. Then we can find it again by
    iterating over all mdio_bus_class devices.

    Because the OF device tree has now become an integral part of the
    kernel, this can live in mdio_bus.c (which contains the needed
    mdio_bus_class structure) instead of of_mdio.c.

    Signed-off-by: David Daney <david.daney@cavium.com>
    Cc: Grant Likely <grant.likely@secretlab.ca>
    Cc: "David S. Miller" <davem@davemloft.net>
    ---
    drivers/net/phy/mdio_bus.c | 32 ++++++++++++++++++++++++++++++++
    drivers/of/of_mdio.c | 2 ++
    include/linux/of_mdio.h | 2 ++
    3 files changed, 36 insertions(+), 0 deletions(-)

    diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
    index 8985cc6..83d5c9f 100644
    --- a/drivers/net/phy/mdio_bus.c
    +++ b/drivers/net/phy/mdio_bus.c
    @@ -88,6 +88,38 @@ static struct class mdio_bus_class = {
    .dev_release = mdiobus_release,
    };

    +#ifdef CONFIG_OF_MDIO
    +/* Helper function for of_mdio_find_bus */
    +static int of_mdio_bus_match(struct device *dev, void *mdio_bus_np)
    +{
    + return dev->of_node == mdio_bus_np;
    +}
    +/**
    + * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
    + * @mdio_np: Pointer to the mii_bus.
    + *
    + * Returns a pointer to the mii_bus, or NULL if none found.
    + *
    + * Because the association of a device_node and mii_bus is made via
    + * of_mdiobus_register(), the mii_bus cannot be found before it is
    + * registered with of_mdiobus_register().
    + *
    + */
    +struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
    +{
    + struct device *d;
    +
    + if (!mdio_bus_np)
    + return NULL;
    +
    + d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np,
    + of_mdio_bus_match);
    +
    + return d ? to_mii_bus(d) : NULL;
    +}
    +EXPORT_SYMBOL(of_mdio_find_bus);
    +#endif
    +
    /**
    * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
    * @bus: target mii_bus
    diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
    index 483c0ad..2574abd 100644
    --- a/drivers/of/of_mdio.c
    +++ b/drivers/of/of_mdio.c
    @@ -45,6 +45,8 @@ int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
    for (i=0; i<PHY_MAX_ADDR; i++)
    mdio->irq[i] = PHY_POLL;

    + mdio->dev.of_node = np;
    +
    /* Register the MDIO bus */
    rc = mdiobus_register(mdio);
    if (rc)
    diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
    index 53b94e0..912c27a 100644
    --- a/include/linux/of_mdio.h
    +++ b/include/linux/of_mdio.h
    @@ -22,4 +22,6 @@ extern struct phy_device *of_phy_connect_fixed_link(struct net_device *dev,
    void (*hndlr)(struct net_device *),
    phy_interface_t iface);

    +extern struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
    +
    #endif /* __LINUX_OF_MDIO_H */
    --
    1.7.2.3


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