On 1/7/25 2:48 AM, Julien Stephan wrote: > Add a section for alert support, explaining how user can use iio events > attributes to enable alert and set thresholds. > > Signed-off-by: Julien Stephan <jstephan@xxxxxxxxxxxx> > --- > Documentation/iio/ad7380.rst | 32 +++++++++++++++++++++++++++++++- > 1 file changed, 31 insertions(+), 1 deletion(-) > > diff --git a/Documentation/iio/ad7380.rst b/Documentation/iio/ad7380.rst > index c46127700e14ca9ec3cac0bd5776b6702f2659e2..9b4407eeaf1d4309c06c64071ed08b4ac80944d2 100644 > --- a/Documentation/iio/ad7380.rst > +++ b/Documentation/iio/ad7380.rst > @@ -92,6 +92,37 @@ must restart iiod using the following command: > > root:~# systemctl restart iiod > > +Alert > +----- > + > +When configured in 1 SDO line mode (see `SPI wiring modes`_), the SDOB or the > +SDOD line (respectively for the 2 or 4 channels variants) can act as an alert > +pin. I think 4-channel variant could also be used in 2-wire mode while also using ALERT. Of course, that isn't supported in the driver yet though. > + > +At the end of a conversion the low-active alert pin gets asserted if the nit: active-low > +conversion result exceeds the alert high limit or falls below the alert low > +limit. It is cleared, on a falling edge of CS. The alert pin is common to all > +channels. > + > +User can enable alert using the regular iio events attribute: > + > +.. code-block:: bash > + > + events/thresh_either_en > + > +The high and low thresholds are common to all channels and can also be set using > +regular iio events attributes: > + > +.. code-block:: bash > + > + events/in_thresh_falling_value > + events/in_thresh_rising_value > + > +If debugfs is enabled anc configured, user can read the ALERT register to s/anc/and/ or s/enabled and configured/available/ > +determine the faulty channel and direction. > + > +In most use cases, user will hardwire the alert pin to trigger a shutdown. > + > Channel selection and sequencer (single-end chips only) > ------------------------------------------------------- > > @@ -144,7 +175,6 @@ Unimplemented features > - Rolling average oversampling > - Power down mode > - CRC indication > -- Alert > > > Device buffers > With the typo fixed: Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>
