[RFC] staging: greybus: arche still depends on missing USB3613 provider

[Pengpeng Hou]

Hi,

while auditing conditional provider/header contracts, I noticed that Greybus
Arche still appears to describe a USB3613 provider world that is absent from
current mainline.

drivers/staging/greybus/Kconfig still has:

depends on USB_HSIC_USB3613 || COMPILE_TEST

and drivers/staging/greybus/arche-platform.c still conditionally includes
the USB3613 header and calls usb3613_hub_mode_ctrl() when
CONFIG_USB_HSIC_USB3613 is enabled.  However, the current tree does not appear
to provide include/linux/usb/usb3613.h or a Kconfig provider for
USB_HSIC_USB3613.

I am not sending a patch yet because this is staging/hardware policy sensitive.
The possible directions seem to be:

1. restore or move the USB3613 provider/header if the hardware path is still
   intended;
2. remove the stale USB3613 integration path and rely on the local stub;
3. change the Kconfig dependency to describe only current supported worlds; or
4. keep the contract if an out-of-tree provider is intentionally expected.

Could you advise which direction is expected for Arche?

This is static source/Kconfig/header analysis only.  I have not tested Arche
hardware.

Thanks,
Pengpeng