[PATCH 5/5] PCI: iproc: Properly handle optional PHYs

[Thierry Reding <thierry.reding@gmail.com>]

From: Thierry Reding <treding@nvidia.com>

devm_phy_get() can fail for a number of resides besides probe deferral.
It can for example return -ENOMEM if it runs out of memory as it tries
to allocate devres structures. Propagating only -EPROBE_DEFER is
problematic because it results in these legitimately fatal errors being
treated as "PHY not specified in DT".

What we really want is to ignore the optional PHYs only if they have not
been specified in DT. devm_phy_optional_get() is a function that exactly
does what's required here, so use that instead.

Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 drivers/pci/controller/pcie-iproc-platform.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/controller/pcie-iproc-platform.c b/drivers/pci/controller/pcie-iproc-platform.c
index 5a3550b6bb29..9ee6200a66f4 100644
--- a/drivers/pci/controller/pcie-iproc-platform.c
+++ b/drivers/pci/controller/pcie-iproc-platform.c
@@ -93,12 +93,9 @@ static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
 	pcie->need_ib_cfg = of_property_read_bool(np, "dma-ranges");
 
 	/* PHY use is optional */
-	pcie->phy = devm_phy_get(dev, "pcie-phy");
-	if (IS_ERR(pcie->phy)) {
-		if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-		pcie->phy = NULL;
-	}
+	pcie->phy = devm_phy_optional_get(dev, "pcie-phy");
+	if (IS_ERR(pcie->phy))
+		return PTR_ERR(pcie->phy);
 
 	ret = devm_of_pci_get_host_bridge_resources(dev, 0, 0xff, &resources,
 						    &iobase);
-- 
2.22.0