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iio: adc: Add ad7124 support

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The ad7124-4 and ad7124-8 are a family of 4 and 8 channel sigma-delta ADCs
with 24-bit precision and reference.

Three power modes are available which in turn affect the output data rate:
 * Full power: 9.38 SPS to 19,200 SPS
 * Mid power: 2.34 SPS to 4800 SPS
 * Low power: 1.17 SPS to 2400 SPS

The ad7124-4 can be configured to have four differential inputs, while
ad7124-8 can have 8. Moreover, ad7124 also supports per channel
configuration. Each configuration consists of gain, reference source,
output data rate and bipolar/unipolar configuration.

Datasheets:
Link: http://www.analog.com/media/en/technical-documentation/data-sheets/AD7124-4.pdf
Link: http://www.analog.com/media/en/technical-documentation/data-sheets/ad7124-8.pdf

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Stefan Popa
2018-11-13 13:21:32 +02:00
committed by Jonathan Cameron
parent 90c430d32c
commit b3af341bbd
4 changed files with 703 additions and 0 deletions
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7
MAINTAINERS
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@@ -839,6 +839,13 @@ S: Supported
F: drivers/iio/dac/ad5758.c
F: Documentation/devicetree/bindings/iio/dac/ad5758.txt
ANALOG DEVICES INC AD7124 DRIVER
M: Stefan Popa <stefan.popa@analog.com>
L: linux-iio@vger.kernel.org
W: http://ez.analog.com/community/linux-device-drivers
S: Supported
F: drivers/iio/adc/ad7124.c
ANALOG DEVICES INC AD9389B DRIVER
M: Hans Verkuil <hans.verkuil@cisco.com>
L: linux-media@vger.kernel.org

11
drivers/iio/adc/Kconfig
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@@ -10,6 +10,17 @@ config AD_SIGMA_DELTA
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
config AD7124
tristate "Analog Devices AD7124 and similar sigma-delta ADCs driver"
depends on SPI_MASTER
select AD_SIGMA_DELTA
help
Say yes here to build support for Analog Devices AD7124-4 and AD7124-8
SPI analog to digital converters (ADC).
To compile this driver as a module, choose M here: the module will be
called ad7124.
config AD7266
tristate "Analog Devices AD7265/AD7266 ADC driver"
depends on SPI_MASTER

1
drivers/iio/adc/Makefile
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@@ -5,6 +5,7 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
obj-$(CONFIG_AD7124) += ad7124.o
obj-$(CONFIG_AD7266) += ad7266.o
obj-$(CONFIG_AD7291) += ad7291.o
obj-$(CONFIG_AD7298) += ad7298.o

684
drivers/iio/adc/ad7124.c Normal file
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