iio: ina2xx: add ABI documentation entry sysfs-bus-iio-ina2xx-adc

Documentation for attributes:

 * in_allow_async_readout
 * in_shunt_resistor

Signed-off-by: Marc Titinger <mtitinger@baylibre.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-ina2xx-adc b/Documentation/ABI/testing/sysfs-bus-iio-ina2xx-adc
new file mode 100644
index 000000000000..8916f7ec6507
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-ina2xx-adc
@@ -0,0 +1,24 @@
+What:           /sys/bus/iio/devices/iio:deviceX/in_allow_async_readout
+Date:           December 2015
+KernelVersion:  4.4
+Contact:        linux-iio@vger.kernel.org
+Description:
+                By default (value '0'), the capture thread checks for the Conversion
+                Ready Flag to being set prior to committing a new value to the sample
+                buffer. This synchronizes the in-chip conversion rate with the
+                in-driver readout rate at the cost of an additional register read.
+
+                Writing '1' will remove the polling for the Conversion Ready Flags to
+                save the additional i2c transaction, which will improve the bandwidth
+                available for reading data. However, samples can be occasionally skipped
+                or repeated, depending on the beat between the capture and conversion
+                rates.
+
+What:           /sys/bus/iio/devices/iio:deviceX/in_shunt_resistor
+Date:           December 2015
+KernelVersion:  4.4
+Contact:        linux-iio@vger.kernel.org
+Description:
+                The value of the shunt resistor may be known only at runtime fom an
+                eeprom content read by a client application. This attribute allows to
+                set its value in ohms.