[PATCH 3/4] iio: ABI: stm32-timer-trigger: Fuse unusual ABI into main doc.

[Jonathan Cameron <jic23@kernel.org>]

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

We can't duplicate the description of sampling_frequency. This device
has some unusual requirements which we solved by giving a
sampling_frequency of 0 special meaning. As such add a note
about this unusual usage to the main documentation.

Whilst I don't particularly like this resolution, it is the best
I could come up with given earlier discussion on this topic.

Link: https://lore.kernel.org/linux-iio/20210315101217.00002c50@Huawei.com/
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
---
 Documentation/ABI/testing/sysfs-bus-iio             | 3 +++
 Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 | 8 --------
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 3e00d7f7ee22..e81ba6f5e1c8 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -107,6 +107,9 @@ Description:
 		relevant directories.  If it affects all of the above
 		then it is to be found in the base device directory.
 
+		The stm32-timer-trigger has the additional characteristic that
+		a sampling_frequency of 0 is defined to stop sampling.
+
 What:		/sys/bus/iio/devices/iio:deviceX/sampling_frequency_available
 What:		/sys/bus/iio/devices/iio:deviceX/in_intensity_sampling_frequency_available
 What:		/sys/bus/iio/devices/iio:deviceX/in_proximity_sampling_frequency_available
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
index c4a4497c249a..05074c4a65e2 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
+++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
@@ -90,14 +90,6 @@ Description:
 		Reading returns the current master modes.
 		Writing set the master mode
 
-What:		/sys/bus/iio/devices/triggerX/sampling_frequency
-KernelVersion:	4.11
-Contact:	benjamin.gaignard@st.com
-Description:
-		Reading returns the current sampling frequency.
-		Writing an value different of 0 set and start sampling.
-		Writing 0 stop sampling.
-
 What:		/sys/bus/iio/devices/iio:deviceX/in_count0_preset
 KernelVersion:	4.12
 Contact:	benjamin.gaignard@st.com
-- 
2.36.1