iio: dac: adding support for Microchip MCP47FEB02

This is the iio driver for Microchip MCP47F(E/V)B(0/1/2)1,
MCP47F(E/V)B(0/1/2)2, MCP47F(E/V)B(0/1/2)4 and MCP47F(E/V)B(0/1/2)8 series
of buffered voltage output Digital-to-Analog Converters with nonvolatile or
volatile memory and an I2C Interface.

The families support up to 8 output channels.

The devices can be 8-bit, 10-bit and 12-bit.

Signed-off-by: Ariana Lazar <ariana.lazar@microchip.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

MAINTAINERS

@@ -15660,6 +15660,7 @@ M:	Ariana Lazar <ariana.lazar@microchip.com>
 L:	linux-iio@vger.kernel.org
 S:	Supported
 F:	Documentation/devicetree/bindings/iio/dac/microchip,mcp47feb02.yaml
+F:	drivers/iio/dac/mcp47feb02.c
 
 MCP4821 DAC DRIVER
 M:	Anshul Dalal <anshulusr@gmail.com>

drivers/iio/dac/Kconfig

@@ -524,6 +524,26 @@ config MCP4728
 	  To compile this driver as a module, choose M here: the module
 	  will be called mcp4728.
 
+config MCP47FEB02
+	tristate "MCP47F(E/V)B01/02/04/08/11/12/14/18/21/22/24/28 DAC driver"
+	depends on I2C
+	help
+	  Say yes here if you want to build the driver for the Microchip:
+	  - 8-bit DAC:
+	    MCP47FEB01, MCP47FEB02, MCP47FEB04, MCP47FEB08,
+	    MCP47FVB01, MCP47FVB02, MCP47FVB04, MCP47FVB08
+	  - 10-bit DAC:
+	    MCP47FEB11, MCP47FEB12, MCP47FEB14, MCP47FEB18,
+	    MCP47FVB11, MCP47FVB12, MCP47FVB14, MCP47FVB18
+	  - 12-bit DAC:
+	    MCP47FEB21, MCP47FEB22, MCP47FEB24, MCP47FEB28,
+	    MCP47FVB21, MCP47FVB22, MCP47FVB24, MCP47FVB28
+	  having 1 to 8 channels, 8/10/12-bit digital-to-analog converter
+	  (DAC) with I2C interface.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called mcp47feb02.
+
 config MCP4821
 	tristate "MCP4801/02/11/12/21/22 DAC driver"
 	depends on SPI

drivers/iio/dac/Makefile

@@ -52,6 +52,7 @@ obj-$(CONFIG_MAX5522) += max5522.o
 obj-$(CONFIG_MAX5821) += max5821.o
 obj-$(CONFIG_MCP4725) += mcp4725.o
 obj-$(CONFIG_MCP4728) += mcp4728.o
+obj-$(CONFIG_MCP47FEB02) += mcp47feb02.o
 obj-$(CONFIG_MCP4821) += mcp4821.o
 obj-$(CONFIG_MCP4922) += mcp4922.o
 obj-$(CONFIG_STM32_DAC_CORE) += stm32-dac-core.o