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@xxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hcd.c | 20 ++++++++++++++++++++
drivers/usb/host/Kconfig | 11 +++++++++++
2 files changed, 31 insertions(+)
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index d939521..da9c4ba 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2597,6 +2597,26 @@ int usb_add_hcd(struct usb_hcd *hcd,
int retval;
struct usb_device *rhdev;
+#ifdef CONFIG_USB_HCD_EXTERNAL_PHY
+ if (!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;
+ }
+ }
+#endif
+
dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
/* Keep old behaviour if authorized_default is not in [0, 1]. */
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index b3f20d7..2e1f2b0 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -706,3 +706,14 @@ config USB_HCD_TEST_MODE
This option is of interest only to developers who need to validate
their USB hardware designs. It is not needed for normal use. If
unsure, say N.
+
+config USB_HCD_EXTERNAL_PHY
+ bool "Set up external USB phy bound to the USB HCD"
+ select USB_PHY
+ ---help---
+ Some USB host controllers require an external USB phy.
+ This adds generic USB phy support to the USB HCD driver.
+ When the HCD is being initialized, the HC driver searches
+ for a USB phy, bound to the HCD. If no USB phy is bound
+ to the HCD, the HCD is initialized as usual.
+ If unsure, say N.
--
1.8.3.1
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