linux-kernel - Re: [PATCHv5 7/7] usb: dwc2: Update Kconfig to support dual-role

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Date:	Thu, 23 Oct 2014 10:05:43 -0500
From:	Dinh Nguyen <dinguyen@...nsource.altera.com>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	<paulz@...opsys.com>, <balbi@...com>, <dinh.linux@...il.com>,
	<linux-kernel@...r.kernel.org>, <swarren@...dotorg.org>,
	<b.zolnierkie@...sung.com>, <matthijs@...in.nl>,
	<r.baldyga@...sung.com>, <jg1.han@...sung.com>,
	<sachin.kamat@...aro.org>, <ben-linux@...ff.org>,
	<dianders@...omium.org>, <kever.yang@...k-chips.com>,
	<linux-usb@...r.kernel.org>
Subject: Re: [PATCHv5 7/7] usb: dwc2: Update Kconfig to support dual-role

On 10/22/2014 03:27 PM, Paul Bolle wrote:
> On Tue, 2014-10-21 at 15:47 -0500, Dinh Nguyen wrote:
>> On 10/20/2014 02:42 PM, Paul Bolle wrote:
>>> (Side note: drivers/usb/dwc2/Kconfig is sourced (in drivers/usb/Kconfig)
>>> even if USB is _not_ set. But USB_DCW2 still depends on USB. Why is
>>> that?)
>>
>> Because USB is for Host-Side support. DWC2 driver should only get built
>> for when USB is enabled. I think you're getting USB and USB_SUPPORT
>> mixed up.
> 
> No, I don't think I did. Because in drivers/usb/Kconfig we see  
>     if USB
> 
>     [...]
> 
>     endif
> 
>     [...]
> 
>     source "drivers/usb/dwc2/Kconfig"
> 
>     [...]

Well, CONFIG_USB enables the host stack that is needed by the DWC2
driver, without CONFIG_USB, the DWC2 driver will not be able to build.

> 
>> In addition, thanks to your comment, I realized that DWC2 should also be
>> available to build when USB_GADGET is enabled. A patch has been sent:
>>
>> http://marc.info/?l=linux-usb&m=141392377124818&w=2
> 
> I haven't checked, but doesn't this mean USB_DWC2 could just depend on
> USB_SUPPORT?
> 
I don't think so because USB_SUPPORT will not select USB or USB_GAGDGET,
and the DWC2 driver will need either 1 or both for it to build correctly.

Dinh

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