linux-kernel - Re: [PATCH v2 3/3] drivers: cleanup Kconfig stuff

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Date:	Wed, 20 Oct 2010 12:23:13 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Roger Quadros <roger.quadros@...ia.com>
Cc:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>,
	linux-main <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>, Felipe Balbi <balbi@...com>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v2 3/3] drivers: cleanup Kconfig stuff

On Wed, Oct 20, 2010 at 12:14 PM, Roger Quadros <roger.quadros@...ia.com> wrote:
> On 10/20/2010 11:53 AM, ext felipe.contreras@...il.com wrote:
>>
>> On Wed, Oct 20, 2010 at 10:46 AM, Roger Quadros<roger.quadros@...ia.com>
>>  wrote:
>>>
>>> On 10/19/2010 05:33 PM, ext Felipe Contreras wrote:
>>>>
>>>> On Tue, Oct 19, 2010 at 4:40 PM, Roger Quadros<roger.quadros@...ia.com>
>>>>  wrote:
>>>>>>
>>>>>> @@ -843,6 +841,7 @@ config USB_CDC_COMPOSITE
>>>>>>  config USB_G_NOKIA
>>>>>>        tristate "Nokia composite gadget"
>>>>>>        depends on PHONET
>>>>>> +       depends on USB_GADGET_MUSB_HDRC
>>>>>
>>>>> This is wrong. Is there a build problem or run-time problem without
>>>>> this?
>>>>
>>>> Try:
>>>> CONFIG_USB_G_NOKIA=y
>>>> CONFIG_USB_GADGET_MUSB_HDRC=n
>>>>
>>>> At least g_nokia doesn't seem to work correctly on my N900.
>>>>
>>> It won't work on N900 because N900 has MUSB USB gadget controller and it
>>> needs to be selected somehow while building for N900.
>>>
>>> You should set CONFIG_USB_GADGET_MUSB_HDRC to y somewhere else while
>>> building for N900 and not here because g_nokia is not MUSB specific.
>>
>> How do you expect people to know that? The Kconfig should define what
>> USB_G_NOKIA needs to work, so that people can enable those things
>> without go Googling hunting for a workable defconfig. Right now people
>> can build g_nokia modules that don't work, and that shouldn't be
>> allowed by the Kconfig.
>>
>
> USB_G_NOKIA just needs a USB gadget controller to work. The gadget
> controller used for the board should come from the board's Kconfig which
> will ideally be supplied by the board's vendor.

Ok, but USB_OMAP is not supposed to work on the N900? (I tried and it didn't)

> For example, can't USB_GADGET_MUSB_HDRC be selected in MACH_NOKIA_RX51 in
> arch/arm/mach-omap2/Kconfig? or is there a better place to put it?

I don't think so, because people might not want USB at all. The ideal
case would be for USB_GADGET_MUSB_HDRC to be selected automatically
when the user selects USB and USB_GADGET, but that's not happening
because USB_GADGET_OMAP is selected first (all the dependencies are
met).

-- 
Felipe Contreras
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