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 <davidjulianveens...@gmail.com>
---
Changes in v3:
 - Remove axis modifier on in_angle.

 Documentation/ABI/testing/sysfs-bus-iio | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio 
b/Documentation/ABI/testing/sysfs-bus-iio
index 6a5f34b4d5b9..240287e2343a 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -190,6 +190,13 @@ 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_raw
+KernelVersion: 4.17
+Contact:       linux-...@vger.kernel.org
+Description:
+               Angle of rotation. 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 +304,7 @@ 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-...@vger.kernel.org
 Description:
@@ -350,6 +358,7 @@ 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-...@vger.kernel.org
 Description:
-- 
2.16.2

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