iio: adc: Add ad7124 support

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>

1 files changed, 7 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 6689f6feb52d..457f29b863e5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -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