[V2,7/8] usb: gadget: Add UDC driver for tegra XUSB device mode controller

[Thierry Reding <thierry.reding@gmail.com>]

On Thu, Apr 25, 2019 at 04:00:05PM +0300, Felipe Balbi wrote:
> Nagarjuna Kristam <nkristam@nvidia.com> writes:
> 
> > This patch adds UDC driver for tegra XUSB 3.0 device mode controller.
> > XUSB device mode controller support SS, HS and FS modes
> >
> > Based on work by:
> >   Mark Kuo <mkuo@nvidia.com>
> >   Andrew Bresticker <abrestic@chromium.org>
> >
> > Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
> > ---
> >  drivers/usb/gadget/udc/Kconfig      |   10 +
> >  drivers/usb/gadget/udc/Makefile     |    1 +
> >  drivers/usb/gadget/udc/tegra_xudc.c | 3702 +++++++++++++++++++++++++++++++++++
> >  3 files changed, 3713 insertions(+)
> >  create mode 100644 drivers/usb/gadget/udc/tegra_xudc.c
> >
> > diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
> > index 0a16cbd..f6f469c 100644
> > --- a/drivers/usb/gadget/udc/Kconfig
> > +++ b/drivers/usb/gadget/udc/Kconfig
> > @@ -439,6 +439,16 @@ config USB_GADGET_XILINX
> >  	  dynamically linked module called "udc-xilinx" and force all
> >  	  gadget drivers to also be dynamically linked.
> >  
> > +config USB_TEGRA_XUDC
> > +	tristate "NVIDIA Superspeed USB 3.0 Device Controller"
> > +	depends on ARCH_TEGRA
> 
> no compile_test?

That's not possible right now. The driver depends on functions that
don't have dummy implementations to support COMPILE_TEST. I suppose
that's something that we could change, but does it need to be part
of this initial submission?

On that note:

Nagarjuna, I think we have PHY_TEGRA_XUSB as at least one other
dependency. Without that the driver could be enabled but fail to link
because of the missing implementations that that driver would've
provided.

Thierry