defconfig: Support USB to Serial Chip CH934X.

Change-Id: Ifc5a7b0f7172ece8623b1c47dbd8599cc3ea4583

Author: tzuwen_chang

arch/arm/configs/rockchip_linux_defconfig

@@ -658,6 +658,7 @@ CONFIG_USB_SERIAL_OTI6858=y
 CONFIG_USB_SERIAL_QUALCOMM=y
 CONFIG_USB_SERIAL_SIERRAWIRELESS=y
 CONFIG_USB_SERIAL_OPTION=y
+CONFIG_USB_SERIAL_CH934X=y
 CONFIG_USB_GADGET=y
 CONFIG_USB_GADGET_DEBUG_FILES=y
 CONFIG_USB_GADGET_VBUS_DRAW=500

drivers/usb/serial/Kconfig

@@ -670,6 +670,16 @@ config USB_SERIAL_XSENS_MT
 	  To compile this driver as a module, choose M here: the
 	  module will be called xsens_mt.
 
+config USB_SERIAL_CH934X
+	tristate "USB Driver for USB to Serial Chip CH934X"
+	help
+	  Say Y here if you want to use CH934X driver.
+
+	  This driver supports USB to serial chip CH934X.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ch934x.
+
 config USB_SERIAL_WISHBONE
 	tristate "USB-Wishbone adapter interface driver"
 	help

drivers/usb/serial/Makefile

@@ -60,3 +60,4 @@ obj-$(CONFIG_USB_SERIAL_WISHBONE)		+= wishbone-serial.o
 obj-$(CONFIG_USB_SERIAL_WHITEHEAT)		+= whiteheat.o
 obj-$(CONFIG_USB_SERIAL_XIRCOM)			+= keyspan_pda.o
 obj-$(CONFIG_USB_SERIAL_XSENS_MT)		+= xsens_mt.o
+obj-$(CONFIG_USB_SERIAL_CH934X)			+= ch934x.o