[v2] USB: chipidea: Do not hang when CONFIG_USB_CHIPIDEA_ULPI is not selected

[Shawn Guo <shawnguo@kernel.org>]

On Tue, Jul 03, 2018 at 07:52:07AM -0300, Fabio Estevam wrote:
> Hi Shawn,
> 
> On Tue, Jul 3, 2018 at 12:40 AM, Shawn Guo <shawnguo@kernel.org> wrote:
> 
> > We can have the options in defconfig, but they can still be turned off
> > for whatever reason and we get the hang.  Really, missing a user
> > selectable option in defconfig shouldn't result in a system hang.
> 
> Yes, 100% agree and this is exactly what this USB patch is all about :-)
> 
> The whole point of this USB patch is not to let the the system to hang
> when the defconfig options are turned off.
> 
> It will warn the user that CONFIG_USB_CHIPIDEA_ULPI needs to be
> selected, will propagate an error, but at least the system will not
> hang.
> 
> The user will certainly notice the big warning which says "Select
> CONFIG_USB_CHIPIDEA_ULPI in order to use ULPI mode"
> 
> Please check the original patch of this thread:
> https://patchwork.kernel.org/patch/10486371/

I'm still not convinced this is the best way to go.  But that's USB
maintainer's call.  I will just apply defconfig patches which shouldn't
hurt anyway.

Shawn
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