linux-kernel - Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core

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Date:	Fri, 10 Jun 2016 14:02:36 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Roger Quadros <rogerq@...com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	peter.chen@...escale.com
Cc:	tony@...mide.com, gregkh@...uxfoundation.org,
	dan.j.williams@...el.com, mathias.nyman@...ux.intel.com,
	Joao.Pinto@...opsys.com, jun.li@...escale.com,
	grygorii.strashko@...com, yoshihiro.shimoda.uh@...esas.com,
	robh@...nel.org, nsekhar@...com, b-liu@...com,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v10 08/14] usb: otg: add OTG/dual-role core


Hi,

Roger Quadros <rogerq@...com> writes:
>>> What is wrong with calling it gadget controller?
>> 
>>    It's not a controller, it's a piece of software AFAIU. Or is my English just too weak? :-)
>
> Everything at this point is a piece of software :).
>
> struct usb_gadget, represents the gadget controller device not the
> driver (or software).
>
> struct usb_gadget_driver represents the gadget function driver.
> struct usb_gadget_ops represents the UDC driver ops.

right, and usb_udc was added just to have a way of linking usb_gadget
with usb_gadget_driver so we could have more than one peripheral port in
a system.

-- 
balbi

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