Re: [PATCH v2] net: macb: do not scan PHYs manually

Andrew Lunn
2016-04-29T12:49:13Z

> diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
> index eec3200..d843bc9 100644
> --- a/drivers/net/ethernet/cadence/macb.c
> +++ b/drivers/net/ethernet/cadence/macb.c
> @@ -419,11 +419,62 @@ static int macb_mii_probe(struct net_device *dev)
> return 0;
> }
>
> +static int macb_mii_of_init(struct macb *bp, struct device_node *np)
> +{
> + struct device_node *mdio;
> + int err, i;
> +
> + mdio = of_get_child_by_name(np, "mdio");
> + if (mdio)
> + return of_mdiobus_register(bp->mii_bus, mdio);

We want to encourage driver writers to use an mdio subnode inside
there MAC node. So i wounder if this looking for the child and using
it should go into the core code?

Florian: What do you think?

> +
> + dev_warn(&bp->pdev->dev,
> + "using deprecated PHY probing mechanism. Please update device tree.");
> +
> + /* try dt phy registration */
> + err = of_mdiobus_register(bp->mii_bus, np);
> + if (err)
> + return err;
> +
> + /* fallback to standard phy registration if no phy were
> + * found during dt phy registration
> + */
> + if (!phy_find_first(bp->mii_bus)) {

I would also suggest putting a warning here, saying that PHYs should
be listed in the device tree.

> + for (i = 0; i < PHY_MAX_ADDR; i++) {
> + struct phy_device *phydev;
> +
> + phydev = mdiobus_scan(bp->mii_bus, i);
> + if (IS_ERR(phydev)) {
> + err = PTR_ERR(phydev);

FYI: There is a change making its way through which will mean
mdiobus_scan() will return -ENODEV where there is nothing on the bus
at that address, rather than the current NULL. You will need to adopt
this here.

Andrew