4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Arnd Bergmann <arnd@xxxxxxxx>
commit 3d54d10c6afed34fd45b852bf76f55e8da31d8ef upstream.
When EXTCON is a loadable module, mtu3 fails to link as built-in:
drivers/usb/mtu3/mtu3_plat.o: In function `mtu3_probe':
mtu3_plat.c:(.text+0x690): undefined reference to `extcon_get_edev_by_phandle'
Add a Kconfig dependency to force mtu3 also to be a loadable module
if extconn is, but still allow it to be built without extcon.
Fixes: d0ed062a8b75 ("usb: mtu3: dual-role mode support")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/mtu3/Kconfig | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/usb/mtu3/Kconfig
+++ b/drivers/usb/mtu3/Kconfig
@@ -4,6 +4,7 @@ config USB_MTU3
tristate "MediaTek USB3 Dual Role controller"
depends on EXTCON && (USB || USB_GADGET) && HAS_DMA
depends on ARCH_MEDIATEK || COMPILE_TEST
+ depends on EXTCON || !EXTCON
select USB_XHCI_MTK if USB_SUPPORT && USB_XHCI_HCD
help
Say Y or M here if your system runs on MediaTek SoCs with
