drivers: iio: adc: AD7768 Driver support

Add support for AD7768 4/8 channel,simultaneous sampling Sigma-Delta ADC

Signed-off-by: Janani Sunil <janani.sunil@analog.com>

Author: jansunil

Documentation/devicetree/bindings/iio/adc/adi,ad7768.yaml

@@ -7,7 +7,7 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
 title: Analog Devices AD7768 and AD7768-4 ADC device driver
 
 maintainers:
-  - Michael Hennerich <michael.hennerich@analog.com>
+  - Janani Sunil <janani.sunil@analog.com>
 
 description: |
   The AD7768 is a 8-channel, 24-bit simultaneous sampling ADC with configurable
@@ -114,8 +114,8 @@ patternProperties:
         maximum: 1
         description: |
           Channel mode selection:
-            0 - Channel uses global mode settings
-            1 - Channel uses individual mode settings
+            0 - Channel uses Mode A settings
+            1 - Channel uses Mode B settings
 
       adi,prebuf-pos-en:
         type: boolean
@@ -223,7 +223,6 @@ examples:
     #include <dt-bindings/iio/adc/adi,ad7768.h>
     #include <dt-bindings/gpio/gpio.h>
 
-    // AD7768-4 example
     spi {
         #address-cells = <1>;
         #size-cells = <0>;
@@ -241,7 +240,7 @@ examples:
             clock-names = "mclk";
 
             adi,data-lines-number = <4>;
-            adi,common-mode-output-v = <AD7768_2P05_V>;
+            adi,common-mode-output-v = <AD7768_2P14_V>;
             adi,power-mode = <AD7768_POWER_MODE_FAST>;
 
             io-backends = <&iio_backend>;
@@ -264,4 +263,4 @@ examples:
             };
         };
     };
-...
+...

drivers/iio/adc/Kconfig

@@ -382,6 +382,20 @@ config AD7766
 	  To compile this driver as a module, choose M here: the module will be
 	  called ad7766.
 
+config AD7768
+	tristate "Analog Devices AD7768 ADC driver"
+	depends on SPI_MASTER
+	depends on ADI_AXI_ADC
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+	select REGMAP_SPI
+	help
+	  Say yes here to build support for Analog Devices AD7768 and AD7768-4
+	  SPI analog to digital converters.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ad7768.
+
 config AD7768_1
 	tristate "Analog Devices AD7768-1 ADC driver"
 	depends on SPI
@@ -547,6 +561,7 @@ config ADI_AXI_ADC
 	select IIO_BUFFER_HW_CONSUMER
 	select IIO_BUFFER_DMAENGINE
 	select REGMAP_MMIO
+	select REGMAP_SPI
 	select IIO_BACKEND
 	help
 	  Say yes here to build support for Analog Devices Generic

drivers/iio/adc/Makefile

@@ -36,6 +36,7 @@ obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
 obj-$(CONFIG_AD7606) += ad7606.o
 obj-$(CONFIG_AD7625) += ad7625.o
 obj-$(CONFIG_AD7766) += ad7766.o
+obj-$(CONFIG_AD7768) += ad7768.o
 obj-$(CONFIG_AD7768_1) += ad7768-1.o
 obj-$(CONFIG_AD7779) += ad7779.o
 obj-$(CONFIG_AD7780) += ad7780.o