iio: dpot-dac: DAC driver based on a digital potentiometer

It is assumed that the dpot is used as a voltage divider between the
current dpot wiper setting and the maximum resistance of the dpot. The
divided voltage is provided by a vref regulator.

                  .------.
   .-----------.  |      |
   | vref      |--'    .---.
   | regulator |--.    |   |
   '-----------'  |    | d |
                  |    | p |
                  |    | o |  wiper
                  |    | t |<---------+
                  |    |   |
                  |    '---'       dac output voltage
                  |      |
                  '------+------------+

Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 0de06732159d..e63719d53658 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6123,7 +6123,9 @@ IIO DIGITAL POTENTIOMETER DAC
 M:      Peter Rosin <peda@axentia.se>
 L:      linux-iio@vger.kernel.org
 S:      Maintained
+F:      Documentation/ABI/testing/sysfs-bus-iio-dac-dpot-dac
 F:      Documentation/devicetree/bindings/iio/dac/dpot-dac.txt
+F:      drivers/iio/dac/dpot-dac.c
 
 IIO SUBSYSTEM AND DRIVERS
 M:      Jonathan Cameron <jic23@kernel.org>