iio: dac: New driver for AD5686R, AD5685R, AD5684R Digital to analog converters

New driver for AD5686R, AD5685R, AD5684R Quad channel digital to analog converters

Changes since V1:

drop header file
use strtobool()
Fix dev attribute macros
Reorder probe() function
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/dac/Kconfig

@@ -42,6 +42,17 @@ config AD5791
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad5791.
 
+config AD5686
+	tristate "Analog Devices AD5686R/AD5685R/AD5684R DAC SPI driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices AD5686R, AD5685R,
+	  AD5684R, AD5791 Voltage Output Digital to
+	  Analog Converter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad5686.
+
 config MAX517
 	tristate "Maxim MAX517/518/519 DAC driver"
 	depends on I2C && EXPERIMENTAL

drivers/staging/iio/dac/Makefile

@@ -6,4 +6,5 @@ obj-$(CONFIG_AD5624R_SPI) += ad5624r_spi.o
 obj-$(CONFIG_AD5504) += ad5504.o
 obj-$(CONFIG_AD5446) += ad5446.o
 obj-$(CONFIG_AD5791) += ad5791.o
+obj-$(CONFIG_AD5686) += ad5686.o
 obj-$(CONFIG_MAX517) += max517.o