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net: macb: Fix regression breaking non-MDIO fixed-link PHYs

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[ Upstream commit ab5f11055fdf8dfc3ddbd89e8e3cc550de41d1d3 ]

commit 739de9a1563a ("net: macb: Reorganize macb_mii bringup") broke
initializing macb on the EVB-KSZ9477 eval board.
There, of_mdiobus_register was called even for the fixed-link representing
the RGMII-link to the switch with the result that the driver attempts to
enumerate PHYs on a non-existent MDIO bus:

	libphy: MACB_mii_bus: probed
	mdio_bus f0028000.ethernet-ffffffff: fixed-link has invalid PHY address
	mdio_bus f0028000.ethernet-ffffffff: scan phy fixed-link at address 0
        [snip]
	mdio_bus f0028000.ethernet-ffffffff: scan phy fixed-link at address 31

The "MDIO" bus registration succeeds regardless, having claimed the reset GPIO,
and calling of_phy_register_fixed_link later on fails because it tries
to claim the same GPIO:

	macb f0028000.ethernet: broken fixed-link specification

Fix this by registering the fixed-link before calling mdiobus_register.

Fixes: 739de9a1563a ("net: macb: Reorganize macb_mii bringup")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ahmad Fatoum 2018-08-21 17:35:48 +02:00 committed by Greg Kroah-Hartman
parent 630403ba91
commit 23f64bad17
1 changed files with 17 additions and 10 deletions
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27
drivers/net/ethernet/cadence/macb_main.c
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@ -481,11 +481,6 @@ static int macb_mii_probe(struct net_device *dev)
if (np) {
if (of_phy_is_fixed_link(np)) {
if (of_phy_register_fixed_link(np) < 0) {
dev_err(&bp->pdev->dev,
"broken fixed-link specification\n");
return -ENODEV;
}
bp->phy_node = of_node_get(np);
} else {
bp->phy_node = of_parse_phandle(np, "phy-handle", 0);
@ -568,7 +563,7 @@ static int macb_mii_init(struct macb *bp)
{
struct macb_platform_data *pdata;
struct device_node *np;
int err;
int err = -ENXIO;
/* Enable management port */
macb_writel(bp, NCR, MACB_BIT(MPE));
@ -591,12 +586,23 @@ static int macb_mii_init(struct macb *bp)
dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
np = bp->pdev->dev.of_node;
if (pdata)
bp->mii_bus->phy_mask = pdata->phy_mask;
if (np && of_phy_is_fixed_link(np)) {
if (of_phy_register_fixed_link(np) < 0) {
dev_err(&bp->pdev->dev,
"broken fixed-link specification %pOF\n", np);
goto err_out_free_mdiobus;
}
err = mdiobus_register(bp->mii_bus);
} else {
if (pdata)
bp->mii_bus->phy_mask = pdata->phy_mask;
err = of_mdiobus_register(bp->mii_bus, np);
}
err = of_mdiobus_register(bp->mii_bus, np);
if (err)
goto err_out_free_mdiobus;
goto err_out_free_fixed_link;
err = macb_mii_probe(bp->dev);
if (err)
@ -606,6 +612,7 @@ static int macb_mii_init(struct macb *bp)
err_out_unregister_bus:
mdiobus_unregister(bp->mii_bus);
err_out_free_fixed_link:
if (np && of_phy_is_fixed_link(np))
of_phy_deregister_fixed_link(np);
err_out_free_mdiobus: