The controller driver may be NULL if the controller device is the middle device between platform device and roothub. This middle device may not need a device driver due to all hardware control can be at platform device driver, this platform device is usually a dual-role USB controller device. The benefit of using this middle device is we can keep both controller device's private data (known as struct usb_hcd) for USB core use, and platform device's private data for platform driver use. Signed-off-by: Peter Chen <peter.chen@nxp.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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.. | ||
buffer.c | ||
config.c | ||
devices.c | ||
devio.c | ||
driver.c | ||
endpoint.c | ||
file.c | ||
generic.c | ||
hcd-pci.c | ||
hcd.c | ||
hub.c | ||
hub.h | ||
Kconfig | ||
ledtrig-usbport.c | ||
Makefile | ||
message.c | ||
notify.c | ||
of.c | ||
otg_whitelist.h | ||
port.c | ||
quirks.c | ||
sysfs.c | ||
urb.c | ||
usb-acpi.c | ||
usb.c | ||
usb.h |