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

On 08/07/2017 04:13 PM, Felipe Balbi wrote:
> Hi,
> 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.

Okay. It seems that I can't use u_serial anyway. I will implement
a new tty glue for my case.

Best regards,
Lu Baolu

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