iio: adc: Add support for AD4000

Add support for AD4000 series of low noise, low power, high speed,
successive approximation register (SAR) ADCs.

Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>

Author: machschmitt

drivers/iio/adc/Kconfig

@@ -21,6 +21,18 @@ config AD_SIGMA_DELTA
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 
+config AD4000
+	tristate "Analog Devices AD4000 ADC Driver"
+	depends on SPI
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	help
+	  Say yes here to build support for Analog Devices AD4000 high speed
+	  SPI analog to digital converters (ADC).
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ad4000.
+
 config AD4134
 	tristate "Analog Device AD4134 ADC Driver"
 	depends on SPI

drivers/iio/adc/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o
 obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
 obj-$(CONFIG_AD_PULSAR) += ad_pulsar.o
 obj-$(CONFIG_AD400X) += ad400x.o
+obj-$(CONFIG_AD4000) += ad4000.o
 obj-$(CONFIG_AD4130) += ad4130.o
 obj-$(CONFIG_AD4134) += ad4134.o
 obj-$(CONFIG_AD4630) += ad4630.o