linux-kernel - Re: [PATCH v2 2/4] usb: common: Move u_serial from gadget/function to usb/common

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Date:   Tue, 08 Aug 2017 09:14:23 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] usb: common: Move u_serial from gadget/function to usb/common


Hi,

Lu Baolu <baolu.lu@...ux.intel.com> writes:
>> Lu Baolu <baolu.lu@...ux.intel.com> 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 <baolu.lu@...ux.intel.com>
>> 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.

have you looked at drivers/usb/serial/?

-- 
balbi