[PATCH v3 2/3] Documentation/ABI/testing: Add documentation for AD5766 new ABI

[Cristian Pop]

New interface is proposed for dither functionality. This future allows
composing  an external signals to the selected output channel.
The dither signal can be turned on/off, scaled, inverted, or it can be
selected from different sources.

Signed-off-by: Cristian Pop <cristian.pop@xxxxxxxxxx>
---
 .../ABI/testing/sysfs-bus-iio-dac-ad5766      | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766 b/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766
new file mode 100644
index 000000000000..361bbd0862df
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766
@@ -0,0 +1,45 @@
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_pwr
+KernelVersion:
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Dither power on/off. Write 0 to power on dither or 1 to power it off.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_invert
+KernelVersion:
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Inverts the dither applied to the selected DAC channel. Dither signal is
+		not inverted (default) Dither signal is inverted.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale_available
+KernelVersion:
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Returns possible scalings available for the current channel:
+		"NO_SCALING 75%_SCALING 50%_SCALING 25%_SCALING"
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale
+KernelVersion:
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Scales the dither before it is applied to the selected channel.
+		NO_SCALING - No scaling
+		75%_SCALING - 75% scaling
+		50%_SCALING - 50% scaling
+		25%_SCALING - 25% scaling
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_source_available
+KernelVersion:
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Returns possible dither sources available for the selected channel:
+		"NO_DITHER N0 N1"
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_source
+KernelVersion:
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Selects dither source applied to the selected channel.
+		NO_DITHER - No dither applied
+		N0 - N0 dither signal applied
+		N1 - N1 dither signal applied
-- 
2.17.1