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

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Date:	Wed, 20 Oct 2010 17:38:37 +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 3:33 PM, Roger Quadros <roger.quadros@...ia.com> wrote:
> On 10/20/2010 12:23 PM, ext Felipe Contreras wrote:
>> On Wed, Oct 20, 2010 at 12:14 PM, Roger Quadros<roger.quadros@...ia.com>
>>  wrote:
>>> 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)
>
> No it won't work. USB_OMAP was for older OMAP's. MUSB is on OMAP3 and later.
> But MUSB is not limited to OMAP SoC.

config USB_GADGET_OMAP
  depends ARCH_OMAP

So how about s/ARCH_OMAP/ARCH_OMAP1/

Then USB_GADGET_MUSB_HDRC would be selected by default on OMAP2+.

>>> 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).
>>
> Yes you are right. In think with the current setup (i.e. controller
> selection at kconfig and limitation to one controller per config) we will
> never be able to satisfy all users.
>
> We might need to move to some kind of gadget controller framework and
> runtime controller selection to solve this problem.

Definitely, for multi-omap. But for OMAP1/OMAP2+ setting ARCH_OMAP1 as
I just suggested would do the trick.

-- 
Felipe Contreras
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