usb: gadget: udc: fix snps_udc_plat.c build errors

Fix build errors that happen when CONFIG_EXTCON=m and
CONFIG_USB_SNP_UDC_PLAT=y by preventing that combination in Kconfig.
CONFIG_EXTCON can still be disabled or enabled for this driver since
<linux/extcon.h> has stubs for the disabled case, but if CONFIG_EXTCON=m,
USB_SNP_UDC_PLAT is restricted to m or n (cannot be builtin).

drivers/built-in.o: In function `udc_plat_remove':
snps_udc_plat.c:(.text+0x2c4060): undefined reference to `extcon_unregister_notifier'
drivers/built-in.o: In function `udc_plat_probe':
snps_udc_plat.c:(.text+0x2c438c): undefined reference to `extcon_get_edev_by_phandle'
snps_udc_plat.c:(.text+0x2c43f2): undefined reference to `extcon_register_notifier'
snps_udc_plat.c:(.text+0x2c4416): undefined reference to `extcon_get_state'
snps_udc_plat.c:(.text+0x2c44f7): undefined reference to `extcon_unregister_notifier'

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
index 7cd5c969fcbe9724ec0892403f1a5bd1c7d01320..1e9567091d86073f6e77f85021531de142c055a2 100644 (file)
--- a/drivers/usb/gadget/udc/Kconfig
+++ b/drivers/usb/gadget/udc/Kconfig
@@ -273,6 +273,7 @@ config USB_SNP_CORE
 config USB_SNP_UDC_PLAT
        tristate "Synopsys USB 2.0 Device controller"
        depends on USB_GADGET && OF && HAS_DMA
+       depends on EXTCON || EXTCON=n
        select USB_GADGET_DUALSPEED
        select USB_SNP_CORE
        default ARCH_BCM_IPROC