iio: adc: Add TI ADS8688

This patch adds support for the Texas Intruments ADS8688 ADC.

Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Reviewed-by: Martin Hundebøll <martin.hundeboll@prevas.dk>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index daad72e..9162dfe 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -341,6 +341,16 @@
 	  This driver can also be built as a module. If so, the module will be
 	  called ti-adc128s052.
 
+config TI_ADS8688
+	tristate "Texas Instruments ADS8688"
+	depends on SPI && OF
+	help
+	  If you say yes here you get support for Texas Instruments ADS8684 and
+	  and ADS8688 ADC chips
+
+	  This driver can also be built as a module. If so, the module will be
+	  called ti-ads8688.
+
 config TI_AM335X_ADC
 	tristate "TI's AM335X ADC driver"
 	depends on MFD_TI_AM335X_TSCADC