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usb: hcd: Initialize USB phy if needed

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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>
This commit is contained in:
Valentine Barshak 2013-12-04 01:42:22 +04:00 committed by Greg Kroah-Hartman
parent 103e127d1f
commit 1ae5799ef6
1 changed files with 18 additions and 0 deletions
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18
drivers/usb/core/hcd.c
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@ -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]. */