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| author | Gwendal Grignou <gwendal@chromium.org> | 2021-02-25 17:47:33 -0800 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-03-25 19:13:49 +0000 |
| commit | dafcf4ed8392476099c9e95642d2daa6e61ee1b6 (patch) | |
| tree | 34465b2692ec2b491ef1bf92a4fed1827dbf97ea /Documentation/iio | |
| parent | 7b3589f49b824e718c319dbd31535c608a410a55 (diff) | |
| download | linux-dafcf4ed8392476099c9e95642d2daa6e61ee1b6.tar.gz linux-dafcf4ed8392476099c9e95642d2daa6e61ee1b6.tar.bz2 linux-dafcf4ed8392476099c9e95642d2daa6e61ee1b6.zip | |
iio: hrtimer: Allow sub Hz granularity
Allow setting frequency below 1Hz or sub 1Hz precision.
Useful for slow sensors like ALS.
Test frequency is set properly:
modprobe iio-trig-hrtimer && \
mkdir /sys/kernel/config/iio/triggers/hrtimer/t1 && \
cd /sys/bus/iio/devices/triggerX ;
for i in 1 .1 .01 .001 ; do
echo $i > sampling_frequency
cat sampling_frequency
done
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210226014733.2108544-1-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'Documentation/iio')
| -rw-r--r-- | Documentation/iio/iio_configfs.rst | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/iio/iio_configfs.rst b/Documentation/iio/iio_configfs.rst index dbc61f35ea05..b276397af797 100644 --- a/Documentation/iio/iio_configfs.rst +++ b/Documentation/iio/iio_configfs.rst @@ -99,3 +99,4 @@ Each trigger can have one or more attributes specific to the trigger type. "hrtimer" trigger type doesn't have any configurable attribute from /config dir. It does introduce the sampling_frequency attribute to trigger directory. +That attribute sets the polling frequency in Hz, with mHz precision. |