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SubjectRe: [PATCH v2 2/4] usb: common: Move u_serial from gadget/function to usb/common


Lu Baolu <> writes:
> The component u_serial provides a glue layer between TTY layer
> and a USB gadget device needed to provide a basic serial port
> functionality. Currently, u_serial sits under gadget/function
> and depends on CONFIG_USB_GADGET to be compiled and used.
> Most of the serial gadget devices are based on a UDC (USB device
> controller) and implemented by making use of the Linux gadget
> frameworks. But we are facing other implementions as well. One
> example can be found with xHCI debug capability. The xHCI debug
> capability implements a serial gadget with hardware and firmware,
> and provides an interface similar with xHCI host for submitting
> and reaping the transfer requests.
> In order to make better use of u_serial when implementing xHCI
> debug capability in xHCI driver, this patch moves u_serial.c
> from gadget/function to usb/common, and moves u_serial.h from
> gadget/function to include/linux/usb.
> Signed-off-by: Lu Baolu <>

NAK, u_serial uses the gadget API. It's definitely not COMMON.

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