On Wed, 13 Apr 2022 12:40:10 +0300 Cosmin Tanislav <demonsingur@xxxxxxxxx> wrote: > AD4130-8 is an ultra-low power, high precision, > measurement solution for low bandwidth battery > operated applications. > > The fully integrated AFE (Analog Front-End) > includes a multiplexer for up to 16 single-ended > or 8 differential inputs, PGA (Programmable Gain > Amplifier), 24-bit Sigma-Delta ADC, on-chip > reference and oscillator, selectable filter > options, smart sequencer, sensor biasing and > excitation options, diagnostics, and a FIFO > buffer. > > Signed-off-by: Cosmin Tanislav <cosmin.tanislav@xxxxxxxxxx> > --- > .../ABI/testing/sysfs-bus-iio-adc-ad4130 | 36 +++++++++++++++++++ > 1 file changed, 36 insertions(+) > create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130 > > diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130 b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130 > new file mode 100644 > index 000000000000..942150991e75 > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad4130 > @@ -0,0 +1,36 @@ > +What: /sys/bus/iio/devices/iio:deviceX/in_voltage-voltage_filter_mode_available > +KernelVersion: Make a guess at the kernel version (hopefully this cycle!) We never remember to fill these in later so better to have it slightly wrong than not present at all. > +Contact: linux-iio@xxxxxxxxxxxxxxx > +Description: > + Reading returns a list with the possible filter modes. > + "sinc4" - Sinc 4. Excellent noise performance. Long 1st > + conversion time. No natural 50/60Hz rejection. > + "sinc4+sinc1" - Sinc4 + averaging by 8. Low 1st conversion time. > + "sinc3" - Sinc3. Moderate 1st conversion time. Good noise > + performance. > + "sinc3+rej60" - Sinc3 + 60Hz rejection. At a sampling frequency > + of 50Hz, achieves simultaneous 50Hz and 60Hz > + rejection. > + "sinc3+sinc1" - Sinc3 + averaging by 8. Low 1st conversion time. > + Best used with a sampling frequency of at least > + 216.19Hz. > + "sinc3+pf1" - Sinc3 + Post Filter 1. > + 53dB rejection @ 50Hz, 58dB rejection @ 60Hz. > + "sinc3+pf2" - Sinc3 + Post Filter 2. > + 70dB rejection @ 50Hz, 70dB rejection @ 60Hz. > + "sinc3+pf3" - Sinc3 + Post Filter 3. > + 99dB rejection @ 50Hz, 103dB rejection @ 60Hz. > + "sinc3+pf4" - Sinc3 + Post Filter 4. > + 103dB rejection @ 50Hz, 109dB rejection @ 60Hz. > + > +What: /sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_filter_mode > +KernelVersion: > +Contact: linux-iio@xxxxxxxxxxxxxxx > +Description: > + Set the filter mode of the differential channel. When the filter > + mode changes, the in_voltageY-voltageZ_sampling_frequency and > + in_voltageY-voltageZ_sampling_frequency_available attributes > + might also change to accomodate the new filter mode. > + If the current sampling frequency is out of range for the new > + filter mode, the sampling frequency will be changed to the > + closest valid one.
