usb: dwc3: core: support optional PHYs
Since PHYs for dwc3 is optional (not all SoCs having PHYs for DWC3
should be programmed), do not return from probe if the USB PHY library
returns -ENODEV as that indicates the platform does not have a
programmable PHY.
While this can be considered as a temporary fix, a long term solution
would be to add 'nop' PHY for platforms that does not have programmable
PHY.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 8c627c9..c89570c 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -534,32 +534,26 @@
if (IS_ERR(dwc->usb2_phy)) {
ret = PTR_ERR(dwc->usb2_phy);
-
- /*
- * if -ENXIO is returned, it means PHY layer wasn't
- * enabled, so it makes no sense to return -EPROBE_DEFER
- * in that case, since no PHY driver will ever probe.
- */
- if (ret == -ENXIO)
+ if (ret == -ENXIO || ret == -ENODEV) {
+ dwc->usb2_phy = NULL;
+ } else if (ret == -EPROBE_DEFER) {
return ret;
-
- dev_err(dev, "no usb2 phy configured\n");
- return -EPROBE_DEFER;
+ } else {
+ dev_err(dev, "no usb2 phy configured\n");
+ return ret;
+ }
}
if (IS_ERR(dwc->usb3_phy)) {
ret = PTR_ERR(dwc->usb3_phy);
-
- /*
- * if -ENXIO is returned, it means PHY layer wasn't
- * enabled, so it makes no sense to return -EPROBE_DEFER
- * in that case, since no PHY driver will ever probe.
- */
- if (ret == -ENXIO)
+ if (ret == -ENXIO || ret == -ENODEV) {
+ dwc->usb3_phy = NULL;
+ } else if (ret == -EPROBE_DEFER) {
return ret;
-
- dev_err(dev, "no usb3 phy configured\n");
- return -EPROBE_DEFER;
+ } else {
+ dev_err(dev, "no usb3 phy configured\n");
+ return ret;
+ }
}
dwc->xhci_resources[0].start = res->start;