iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

usb: hcd: Initialize USB phy if needed

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/usb/core/hcd.c
View File

@ -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]. */