iio: Documentation: Add max9611 sysfs documentation

Add documentation for max9611 driver.
Document attributes describing value of shunt resistor installed between
RS+ and RS- voltage sense inputs.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-max9611 b/Documentation/ABI/testing/sysfs-bus-iio-adc-max9611
new file mode 100644 (file)
index 0000000..6d2d2b0
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-max9611
@@ -0,0 +1,17 @@
+What:          /sys/bus/iio/devices/iio:deviceX/in_power_shunt_resistor
+Date:          March 2017
+KernelVersion: 4.12
+Contact:       linux-iio@vger.kernel.org
+Description:   The value of the shunt resistor used to compute power drain on
+                common input voltage pin (RS+). In Ohms.
+
+What:          /sys/bus/iio/devices/iio:deviceX/in_current_shunt_resistor
+Date:          March 2017
+KernelVersion: 4.12
+Contact:       linux-iio@vger.kernel.org
+Description:   The value of the shunt resistor used to compute current flowing
+                between RS+ and RS- voltage sense inputs. In Ohms.
+
+These attributes describe a single physical component, exposed as two distinct
+attributes as it is used to calculate two different values: power load and
+current flowing between RS+ and RS- inputs.