add USB config for GSM Modem

diff --git a/arch/arm/configs/rockchip_defconfig b/arch/arm/configs/rockchip_defconfig
index 544e83eaa99a122cacc18ef24a216517455e808f..19b5832913f7bf64dafc486afbfd59db31a5dece 100755 (executable)
--- a/arch/arm/configs/rockchip_defconfig
+++ b/arch/arm/configs/rockchip_defconfig
@@ -464,6 +464,9 @@ CONFIG_USB_STORAGE_ONETOUCH=y
 CONFIG_USB_STORAGE_KARMA=y
 CONFIG_USB_STORAGE_CYPRESS_ATACB=y
 CONFIG_USB_STORAGE_ENE_UB6250=y
+CONFIG_USB_SERIAL=y
+CONFIG_USB_SERIAL_GENERIC=y
+CONFIG_USB_SERIAL_OPTION=y
 CONFIG_USB_TRANCEVIBRATOR=y
 CONFIG_USB_OTG_WAKELOCK=y
 CONFIG_USB_GADGET=y