[PATCH v2] usb: dwc3: Handle case where setup_phy is not needed

[Michal Simek]

From: Siva Durga Prasad Paladugu <siva.durga.paladugu at xilinx.com>

If CONFIG_PHY is not enabled then the dwc3_setup_phy()
returns ENOTSUPP which can be still valid and intentional
so modify error check to handle this -ENOTSUPP.

The same error handling exists in drivers/usb/host/xhci-dwc3.c already
added by commit d648a50c0a27 ("dwc3: move phy operation to core.c").

Signed-off-by: Siva Durga Prasad Paladugu <siva.durga.paladugu at xilinx.com>
Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

Changes in v2:
- Extend commit message.

Link: https://lists.denx.de/pipermail/u-boot/2019-April/363535.html
      https://lists.denx.de/pipermail/u-boot/2019-June/371889.html

---
 drivers/usb/dwc3/dwc3-generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 36fa16ad4e2e..a936f71d2e5d 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -74,7 +74,7 @@ static int dwc3_generic_probe(struct udevice *dev,
 	}
 
 	rc = dwc3_setup_phy(dev, &priv->phys);
-	if (rc)
+	if (rc && rc != -ENOTSUPP)
 		return rc;
 
 	if (device_is_compatible(dev->parent, "rockchip,rk3399-dwc3"))
-- 
2.28.0