This adds remove_phy flag to the HCD structure. If the flag is set and if hcd->phy is valid, the phy is shutdown and released whenever usb_add_hcd fails or usb_hcd_remove is called. This also adds CONFIG_USB_HCD_EXTERNAL_PHY option that allows the HCD driver to search for a USB phy, bound to the HCD, when the HC is being added. If the USB PHY is found, it is initialized and the remove_phy flag is set. In case PHY is not ready, the usb_add_hcd function returns the -EPROBE_DEFER error code which defers HCD probing till the PHY becomes ready. If no PHY is bound to the HCD, or it has been initialized by the low-level driver before calling usb_add_hcd(), the HCD is added as usual. This approach can be used to initialize the external PHY for the R-Car PCI USB hosts, that share USB ports with USBHS/USBSS devices. All we need to do is to make R-Car Gen2 platform code bind the Gen2 USB phy device to the PCI HC devices, and make the phy-rcar-gen2-usb driver register USB phy with usb_add_phy_dev() AOT usb_add_phy() callback. Valentine Barshak (2): usb: hcd: Remove USB phy if needed usb: hcd: Introduce CONFIG_USB_HCD_EXTERNAL_PHY option drivers/usb/core/hcd.c | 34 +++++++++++++++++++++++++++++++++- drivers/usb/host/Kconfig | 11 +++++++++++ include/linux/usb/hcd.h | 1 + 3 files changed, 45 insertions(+), 1 deletion(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
