[PATCH v2 11/13] staging: iio: Documentation: Add missing sysfs docs for angle channel

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The iio resolver drivers in staging use angle channels. This patch
add missing documentation for this type of channel.

As was discussed in [1], radians is chosen as the unit, to match the
unit of angular velocity.

[1] https://marc.info/?l=linux-driver-devel&m=152190078308330&w=2

Signed-off-by: David Veenstra <davidjulianveenstra@xxxxxxxxx>
---
Change in v2:
  - Introduces in this version.

 Documentation/ABI/testing/sysfs-bus-iio | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 6a5f34b4d5b9..8ad0e55f99ee 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -190,6 +190,15 @@ Description:
 		but should match other such assignments on device).
 		Units after application of scale and offset are m/s^2.
 
+What:		/sys/bus/iio/devices/iio:deviceX/in_angl_x_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_angl_y_raw
+What:		/sys/bus/iio/devices/iio:deviceX/in_angl_z_raw
+KernelVersion:	4.17
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Angle about axis x, y or z (may be arbitrarily assigned). Units
+		after application of scale and offset are radians.
+
 What:		/sys/bus/iio/devices/iio:deviceX/in_anglvel_x_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_anglvel_y_raw
 What:		/sys/bus/iio/devices/iio:deviceX/in_anglvel_z_raw
@@ -297,6 +306,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_pressure_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_magn_offset
 What:		/sys/bus/iio/devices/iio:deviceX/in_rot_offset
+What:		/sys/bus/iio/devices/iio:deviceX/in_angl_offset
 KernelVersion:	2.6.35
 Contact:	linux-iio@xxxxxxxxxxxxxxx
 Description:
@@ -350,6 +360,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_humidityrelative_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_illuminance_scale
 What:		/sys/bus/iio/devices/iio:deviceX/in_countY_scale
+What:		/sys/bus/iio/devices/iio:deviceX/in_angl_scale
 KernelVersion:	2.6.35
 Contact:	linux-iio@xxxxxxxxxxxxxxx
 Description:
-- 
2.16.2

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