iio: adc: Add the TI ads124s08 ADC code

Introduce the TI ADS124S08 and the ADS124S06 ADC
devices from TI.  The ADS124S08 is the 12 channel ADC
and the ADS124S06 is the 6 channel ADC device

These devices share a common datasheet:
http://www.ti.com/lit/gpn/ads124s08

Signed-off-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Dan Murphy 2019-01-11 13:57:06 -06:00 • committed by Jonathan Cameron
commit e717f8c6df
3 changed files with 387 additions and 0 deletions