Re: [PATCH] usb: renesas: fix extcon dependency
From: Arnd Bergmann
Date: Wed Feb 18 2015 - 16:03:23 EST
On Thursday 29 January 2015 11:41:58 Russell King - ARM Linux wrote:
> On Wed, Jan 28, 2015 at 10:47:18PM +0100, Arnd Bergmann wrote:
> > The renesas usbhs driver calls extcon_get_edev_by_phandle(), which
> > is defined in drivers/extcon/extcon-class.c, and that can be a
> > loadable module. If the extcon-class support is disabled, usbhs
> > will work correctly for all devices that do not need extcon.
> > However, if extcon-class is a loadable module, and usbhs is
> > built-in, the kernel fails to link. In order to solve that,
> > we need a Kconfig dependency that allows extcon to be disabled
> > but does not allow usbhs built-in if extcon is a module.
> > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> > diff --git a/drivers/usb/renesas_usbhs/Kconfig b/drivers/usb/renesas_usbhs/Kconfig
> > index de83b9d0cd5c..0ea9040b9f10 100644
> > --- a/drivers/usb/renesas_usbhs/Kconfig
> > +++ b/drivers/usb/renesas_usbhs/Kconfig
> > @@ -6,6 +6,7 @@ config USB_RENESAS_USBHS
> > tristate 'Renesas USBHS controller'
> > depends on USB_GADGET
> > depends on ARCH_SHMOBILE || SUPERH || COMPILE_TEST
> > + depends on EXTCON || !EXTCON # for module build if extcon is
> The comment doesn't make much sense on its own (and when I read it before
> reading the above description, it was down right confusing.) Maybe a
> longer comment would be a good idea?
Sorry for the late reply.
We have a lot of these dependencies, and I never know what a particular
maintainer expects. Let me try to come up with something better.
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