usb: hcd: Initialize USB phy if needed

This adds external USB phy support to USB HCD driver that
allows to find and initialize external USB phy, bound to
the HCD, when the HCD is added.
The usb_add_hcd function returns -EPROBE_DEFER if the USB
phy, bound to the HCD, is not ready.
If no USB phy is bound, the HCD is initialized as usual.

Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 7527c8e4ec64e22c34b303f3877f09d3fb281d40..d3a9bcde53c39e4604f9b9eab3e05d17e51c0d25 100644 (file)
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2589,6 +2589,24 @@ int usb_add_hcd(struct usb_hcd *hcd,
        int retval;
        struct usb_device *rhdev;
 
+       if (IS_ENABLED(CONFIG_USB_PHY) && !hcd->phy) {
+               struct usb_phy *phy = usb_get_phy_dev(hcd->self.controller, 0);
+
+               if (IS_ERR(phy)) {
+                       retval = PTR_ERR(phy);
+                       if (retval == -EPROBE_DEFER)
+                               return retval;
+               } else {
+                       retval = usb_phy_init(phy);
+                       if (retval) {
+                               usb_put_phy(phy);
+                               return retval;
+                       }
+                       hcd->phy = phy;
+                       hcd->remove_phy = 1;
+               }
+       }
+
        dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
 
        /* Keep old behaviour if authorized_default is not in [0, 1]. */