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PCI: keystone: Defer probing if devm_phy_get() returns -EPROBE_DEFER

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A SerDes PHY is optional, so if devm_phy_get() doesn't find one at all,
that's fine.  But if devm_phy_get() finds a PHY that doesn't have a driver
yet, it returns -EPROBE_DEFER.  In that case, defer probing the Keystone
driver.  We may be able to load it later after a PHY driver is loaded.

[bhelgaas: changelog, check for -EPROBE_DEFER first]
Signed-off-by: Shawn Lin <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
This commit is contained in:
Shawn Lin 2016-03-07 12:32:21 +08:00 • committed by Bjorn Helgaas
commit 25de15c958
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/host/pci-keystone.c
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@ -359,6 +359,9 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
/* initialize SerDes Phy if present */
phy = devm_phy_get(dev, "pcie-phy");
if (PTR_ERR_OR_ZERO(phy) == -EPROBE_DEFER)
return PTR_ERR(phy);
if (!IS_ERR_OR_NULL(phy)) {
ret = phy_init(phy);
if (ret < 0)