iio: dac: ad5686: Add support for AD5337

AD5337 belongs to the same family as the AD5338.

The difference is that the AD5337 has 8-bit precision instead of 10-bit.

Add support for the AD5337 chip in the driver.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20221130182632.3856675-2-festevam@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dac/Kconfig

@@ -162,10 +162,10 @@ config AD5696_I2C
 	depends on I2C
 	select AD5686
 	help
-	  Say yes here to build support for Analog Devices AD5311R, AD5338R,
-	  AD5671R, AD5673R, AD5675R, AD5677R, AD5691R, AD5692R, AD5693, AD5693R,
-	  AD5694, AD5694R, AD5695R, AD5696, and AD5696R Digital to Analog
-	  converters.
+	  Say yes here to build support for Analog Devices AD5311R, AD5337,
+	  AD5338R, AD5671R, AD5673R, AD5675R, AD5677R, AD5691R, AD5692R, AD5693,
+	  AD5693R, AD5694, AD5694R, AD5695R, AD5696, and AD5696R Digital to
+	  Analog converters.
 
 	  To compile this driver as a module, choose M here: the module will be
 	  called ad5696.

drivers/iio/dac/ad5686.c

@@ -258,6 +258,7 @@ static const struct iio_chan_spec name[] = {			\
 
 DECLARE_AD5693_CHANNELS(ad5310r_channels, 10, 2);
 DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
+DECLARE_AD5338_CHANNELS(ad5337r_channels, 8, 8);
 DECLARE_AD5338_CHANNELS(ad5338r_channels, 10, 6);
 DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
 DECLARE_AD5679_CHANNELS(ad5674r_channels, 12, 4);
@@ -283,6 +284,12 @@ static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
 		.num_channels = 1,
 		.regmap_type = AD5693_REGMAP,
 	},
+	[ID_AD5337R] = {
+		.channels = ad5337r_channels,
+		.int_vref_mv = 2500,
+		.num_channels = 2,
+		.regmap_type = AD5686_REGMAP,
+	},
 	[ID_AD5338R] = {
 		.channels = ad5338r_channels,
 		.int_vref_mv = 2500,

drivers/iio/dac/ad5686.h

@@ -54,6 +54,7 @@
 enum ad5686_supported_device_ids {
 	ID_AD5310R,
 	ID_AD5311R,
+	ID_AD5337R,
 	ID_AD5338R,
 	ID_AD5671R,
 	ID_AD5672R,

drivers/iio/dac/ad5696-i2c.c

@@ -72,6 +72,7 @@ static void ad5686_i2c_remove(struct i2c_client *i2c)
 
 static const struct i2c_device_id ad5686_i2c_id[] = {
 	{"ad5311r", ID_AD5311R},
+	{"ad5337r", ID_AD5337R},
 	{"ad5338r", ID_AD5338R},
 	{"ad5671r", ID_AD5671R},
 	{"ad5673r", ID_AD5673R},
@@ -92,6 +93,7 @@ MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);
 
 static const struct of_device_id ad5686_of_match[] = {
 	{ .compatible = "adi,ad5311r" },
+	{ .compatible = "adi,ad5337r" },
 	{ .compatible = "adi,ad5338r" },
 	{ .compatible = "adi,ad5671r" },
 	{ .compatible = "adi,ad5675r" },