> +static int bcm6368_mdiomux_probe(struct platform_device *pdev)
> +{
> + struct bcm6368_mdiomux_desc *md;
> + struct mii_bus *bus;
> + struct resource *res;
> + int rc;
> +
> + md = devm_kzalloc(&pdev->dev, sizeof(*md), GFP_KERNEL);
> + if (!md)
> + return -ENOMEM;
> + md->dev = &pdev->dev;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -EINVAL;
> +
> + /* Just ioremap, as this MDIO block is usually integrated into an
> + * Ethernet MAC controller register range
> + */
> + md->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> + if (!md->base) {
> + dev_err(&pdev->dev, "failed to ioremap register\n");
> + return -ENOMEM;
> + }
> +
> + md->mii_bus = devm_mdiobus_alloc(&pdev->dev);
> + if (!md->mii_bus) {
> + dev_err(&pdev->dev, "mdiomux bus alloc failed\n");
> + return ENOMEM;
> + }
> +
> + bus = md->mii_bus;
> + bus->priv = md;
> + bus->name = "BCM6368 MDIO mux bus";
> + snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d", pdev->name, pdev->id);
> + bus->parent = &pdev->dev;
> + bus->read = bcm6368_mdiomux_read;
> + bus->write = bcm6368_mdiomux_write;
> + bus->phy_mask = 0x3f;
> + bus->dev.of_node = pdev->dev.of_node;
> +
> + rc = mdiobus_register(bus);
> + if (rc) {
> + dev_err(&pdev->dev, "mdiomux registration failed\n");
> + return rc;
> + }
So this is different to all the other mux drivers. Normally there is
an MDIO driver. And there is a mux driver. Two separate drivers. The
mux driver uses a phandle to reference the MDIO driver. Here we have
both in one driver.
Does this MDIO bus device exist as a standalone device? Without the
mux? If silicon does exist like that, having two separate drivers
would be better.
Andrew
