Staging: IIO: DDS: AD9832 / AD9835 driver

This is a complete rewrite of the AD9832/35 driver.
Purpose was to move this driver to the recently
created API for such devices.

Changes since V1:
IIO: DDS: AD9832 / AD9835 driver: Apply review feedback

Save a few bytes, use union for data allocated for spi buffers.
Remove use of device IDs.
Fix comments.
Make master clock mclk always type unsigned long.

Signed-off-by: Michael Hennerich <[email protected]>
Acked-by: Jonathan Cameron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: mhennerich

drivers/staging/iio/dds/Kconfig

@@ -15,7 +15,10 @@ config AD9832
 	depends on SPI
 	help
 	  Say yes here to build support for Analog Devices DDS chip
-	  ad9832 and ad9835, provides direct access via sysfs.
+	  AD9832 and AD9835, provides direct access via sysfs.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad9832.
 
 config AD9834
 	tristate "Analog Devices ad9833/4/ driver"