iio:ad5446: Add support for the ad5300/ad5310/ad5320

The ad5300/ad5310/ad5320 is a family of single channel DACs with a SPI interface
similar to the ad5601/ad5611/ad5621 but use a different shift factor for the
data word.

While we are at it also reorder the device part numbers in the ad5446 driver
Kconfig to be ordered alphabetically.

Signed-off-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/dac/Kconfig

···
 	tristate "Analog Devices AD5446 and similar single channel DACs driver"
 	depends on (SPI_MASTER || I2C)
 	help
-	  Say yes here to build support for Analog Devices AD5602, AD5612, AD5622,
+	  Say yes here to build support for Analog Devices AD5300, AD5310, AD5320,
 	  AD5444, AD5446, AD5450, AD5451, AD5452, AD5453, AD5512A, AD5541A, AD5542A,
-	  AD5543, AD5553, AD5601, AD5611, AD5620, AD5621, AD5640, AD5660, AD5662
-	  DACs.
+	  AD5543, AD5553, AD5601, AD5602, AD5611, AD5612, AD5620, AD5621, AD5622,
+	  AD5640, AD5660, AD5662 DACs.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad5446.

drivers/iio/dac/ad5446.c

···
  * parts are supported here.
  */
 enum ad5446_supported_spi_device_ids {
+	ID_AD5300,
+	ID_AD5310,
+	ID_AD5320,
 	ID_AD5444,
 	ID_AD5446,
 	ID_AD5450,
···
 };
 
 static const struct ad5446_chip_info ad5446_spi_chip_info[] = {
+	[ID_AD5300] = {
+		.channel = AD5446_CHANNEL_POWERDOWN(8, 16, 4),
+		.write = ad5446_write,
+	},
+	[ID_AD5310] = {
+		.channel = AD5446_CHANNEL_POWERDOWN(10, 16, 2),
+		.write = ad5446_write,
+	},
+	[ID_AD5320] = {
+		.channel = AD5446_CHANNEL_POWERDOWN(12, 16, 0),
+		.write = ad5446_write,
+	},
 	[ID_AD5444] = {
 		.channel = AD5446_CHANNEL(12, 16, 2),
 		.write = ad5446_write,
···
 };
 
 static const struct spi_device_id ad5446_spi_ids[] = {
+	{"ad5300", ID_AD5300},
+	{"ad5310", ID_AD5310},
+	{"ad5320", ID_AD5320},
 	{"ad5444", ID_AD5444},
 	{"ad5446", ID_AD5446},
 	{"ad5450", ID_AD5450},