When building without modules, it makes sense to configure the kernel to
only use configfs for USB Gadget drivers.

Mark the choice for legacy gadget drivers as optional.

Signed-off-by: Romain Izard <romain.izard....@gmail.com>
cc: <sta...@vger.kernel.org> # 4.9
---
 drivers/usb/gadget/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 8ad203296079..f3ee80ece682 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -460,6 +460,7 @@ config USB_CONFIGFS_F_TCM
 choice
        tristate "USB Gadget Drivers"
        default USB_ETH
+       optional
        help
          A Linux "Gadget Driver" talks to the USB Peripheral Controller
          driver through the abstract "gadget" API.  Some other operating
-- 
2.9.3

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