usb: fotg210: Fix Kconfig for USB host modules

The kernel robot reports a link failure when activating the
FOTG210 host subdriver with =y on a system where the USB host
core is a module (CONFIG_USB=m).

This is a bit of special case, so mimic the Kconfig incantations
from DWC3: let the subdrivers for host or peripheral depend
on the host or gadget support being =y or the same as the
FOTG210 core itself.

This should ensure that either:

- The host (CONFIG_USB) or gadget (CONFIG_GADGET) is compiled
  in and then the FOTG210 can be either module or compiled
  in.

- The host or gadget is modular, and then the FOTG210 module
  must be a module too, or we cannot resolve the symbols
  at link time.

Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/linux-usb/202211112132.0BUPGKCd-lkp@intel.com/
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20221111144821.113665-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/fotg210/Kconfig b/drivers/usb/fotg210/Kconfig
index 534206e..2db6ac9 100644 (file)
--- a/drivers/usb/fotg210/Kconfig
+++ b/drivers/usb/fotg210/Kconfig
@@ -14,7 +14,7 @@ if USB_FOTG210
 
 config USB_FOTG210_HCD
        bool "Faraday FOTG210 USB Host Controller support"
-       depends on USB
+       depends on USB=y || USB=USB_FOTG210
        help
          Faraday FOTG210 is an OTG controller which can be configured as
          an USB2.0 host. It is designed to meet USB2.0 EHCI specification
@@ -24,7 +24,7 @@ config USB_FOTG210_HCD
          module will be called fotg210-hcd.
 
 config USB_FOTG210_UDC
-       depends on USB_GADGET
+       depends on USB_GADGET=y || USB_GADGET=USB_FOTG210
        bool "Faraday FOTG210 USB Peripheral Controller support"
        help
           Faraday USB2.0 OTG controller which can be configured as