linux-kernel - Re: [PATCH] usb: typec: nb7vpq904m: add CONFIG

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Message-ID: <CAA8EJpphJwfL-ZBOirzezBkBQ4E0RhhugtJh_jM0aHsHgp0D8g@mail.gmail.com>
Date:   Thu, 7 Dec 2023 13:58:31 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: nb7vpq904m: add CONFIG_OF dependency

On Thu, 7 Dec 2023 at 13:57, Heikki Krogerus
<heikki.krogerus@...ux.intel.com> wrote:
>
> On Thu, Dec 07, 2023 at 01:55:06PM +0200, Dmitry Baryshkov wrote:
> > On Thu, 7 Dec 2023 at 13:53, Heikki Krogerus
> > <heikki.krogerus@...ux.intel.com> wrote:
> > >
> > > On Wed, Dec 06, 2023 at 01:38:14PM +0100, Arnd Bergmann wrote:
> > > > From: Arnd Bergmann <arnd@...db.de>
> > > >
> > > > DRM_AUX_BRIDGE depends on CONFIG_OF, so the same dependency is needed
> > > > here to avoid a build failure:
> > > >
> > > > WARNING: unmet direct dependencies detected for DRM_AUX_BRIDGE
> > > >   Depends on [n]: HAS_IOMEM [=y] && DRM_BRIDGE [=y] && OF [=n]
> > > >   Selected by [y]:
> > > >   - TYPEC_MUX_NB7VPQ904M [=y] && USB_SUPPORT [=y] && TYPEC [=y] && I2C [=y] && (DRM [=y] || DRM [=y]=n) && DRM_BRIDGE [=y]
> > > > x86_64-linux-ld: drivers/gpu/drm/bridge/aux-bridge.o: in function `drm_aux_bridge_register':
> > > > aux-bridge.c:(.text+0x13b): undefined reference to `auxiliary_device_init'
> > > > x86_64-linux-ld: aux-bridge.c:(.text+0x14d): undefined reference to `__auxiliary_device_add'
> > > > x86_64-linux-ld: drivers/gpu/drm/bridge/aux-bridge.o: in function `drm_aux_bridge_drv_init':
> > > > aux-bridge.c:(.init.text+0x15): undefined reference to `__auxiliary_driver_register'
> > > > x86_64-linux-ld: drivers/gpu/drm/bridge/aux-bridge.o: in function `drm_aux_bridge_drv_exit':
> > > > aux-bridge.c:(.exit.text+0x9): undefined reference to `auxiliary_driver_unregister'
> > > >
> > > > Fixes: c5d296bad640 ("usb: typec: nb7vpq904m: switch to DRM_AUX_BRIDGE")
> > > > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> > > > ---
> > > >  drivers/usb/typec/mux/Kconfig | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig
> > > > index 5120942f309d..818624f59120 100644
> > > > --- a/drivers/usb/typec/mux/Kconfig
> > > > +++ b/drivers/usb/typec/mux/Kconfig
> > > > @@ -40,6 +40,7 @@ config TYPEC_MUX_NB7VPQ904M
> > > >       tristate "On Semiconductor NB7VPQ904M Type-C redriver driver"
> > > >       depends on I2C
> > > >       depends on DRM || DRM=n
> > > > +     depends on OF
> > > >       select DRM_AUX_BRIDGE if DRM_BRIDGE
> > > >       select REGMAP_I2C
> > > >       help
> > >
> > > Shouldn't DRM_BRIDGE depend on OF instead?
> >
> > No. DRM_AUX_BRIDGE depends on OF, DRM_BRIDGE framework doesn't.
>
> Okay, so this probable should also be
>
>         select DRM_AUX_BRIDGE if DRM_BRIDGE and OF

Yes, this is what a patch from Nathan does:
https://patchwork.freedesktop.org/patch/570638/?series=127385&rev=1

-- 
With best wishes
Dmitry