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From: Felipe Balbi <balbi@kernel.org>
To: Petr Vorel <petr.vorel@gmail.com>
Cc: Greg KH <gregkh@linuxfoundation.org>, linux-usb@vger.kernel.org,
 linux-sunxi@lists.linux.dev, linux-sunxi@googlegroups.com
Subject: Re: Mainlining Linux Sunxi SoC AW USB
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Date: Sat, 24 Jul 2021 17:49:54 +0300
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Hi,

Petr Vorel <petr.vorel@gmail.com> writes:
>> > [1] https://github.com/linux-sunxi/sunxi-livesuite/blob/master/awusb/awusb.c
>
>> Why is this even a driver at all, it looks like you can write a small
>> userspace program using libusb to do everything it does, right?  What
>> exactly is this driver needed for?
>
> I'm sorry for not providing more info at the beginning. This is a driver for
> host computer (i.e. developers laptop) used by LiveSuit tool [2] to flash Images
> to the NAND of Allwinner devices. LiveSuit itself [3] is unfortunately provided
> only in binary form. The only open source code with GPL v2 license is awusb
> driver. Thus I thought I could ease my life with upstreaming at least the
> kernel driver. But maybe it's not a good idea. I'm using LiveSuit for flashing
> Allwinner A31, but it requires quite old distro due libqtgui4. Maybe sunxi folks
> use something newer nowadays, but I haven't found anything in their wiki.

looks like you could implement that entirely in userspace with libusb ;-)

-- 
balbi