staging:iio:dac: Add AD5064 driver

This patch adds support for the Analog Devices AD6064, AD6064-1, AD6044, AD6024
quad channel digital-to-analog converter devices.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/dac/Kconfig

@@ -3,6 +3,16 @@
 #
 menu "Digital to analog convertors"
 
+config AD5064
+	tristate "Analog Devices AD5064/64-1/44/24 DAC driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices AD5064, AD5064-1,
+	  AD5044, AD5024 Digital to Analog Converter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad5064.
+
 config AD5624R_SPI
 	tristate "Analog Devices AD5624/44/64R DAC spi driver"
 	depends on SPI

drivers/staging/iio/dac/Makefile

@@ -3,6 +3,7 @@
 #
 
 obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
+obj-$(CONFIG_AD5064) += ad5064.o
 obj-$(CONFIG_AD5504) += ad5504.o
 obj-$(CONFIG_AD5446) += ad5446.o
 obj-$(CONFIG_AD5791) += ad5791.o