On 1/11/25 4:50 PM, Jonathan Santos wrote:

On 01/07, David Lechner wrote:

quoted

On 1/7/25 9:24 AM, Jonathan Santos wrote:

quoted

The Wideband Low Ripple FIR filter is used for AD7768-1 Driver.
Document wideband filter option into filter_type_avaialable

s/avaialable/available/

quoted

attribute.

Signed-off-by: Jonathan Santos <redacted>
---
 Documentation/ABI/testing/sysfs-bus-iio | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index f83bd6829285..c4c21a7bfba1 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio

@@ -2291,6 +2291,8 @@ Description:
 		* "sinc3+pf2" - Sinc3 + device specific Post Filter 2.
 		* "sinc3+pf3" - Sinc3 + device specific Post Filter 3.
 		* "sinc3+pf4" - Sinc3 + device specific Post Filter 4.
+		* "wideband" - FIR filter with wideband low ripple passband

I think "fir" would be a more specific filter type name than "wideband". (i.e.
there are wikipedia pages for sinc and FIR filters, but not one for "wideband"
filters)

Isn't "fir" a bit too generic for this case? Since Wideband here is a class of a FIR filter.
Maybe something like "wideband-fir" or "fir-wideband" would work better?

For this particular chip, no, there is only one FIR filter option on the chip,
so having additional qualifiers doesn't really make a difference.

If we can find a chip that has more than one FIR filter option, then we could
use that to figure out what additional classifiers are might make sense.
"fir-wideband" would only be useful if the same chip also had a "fir-narrowband"
option. But we might find that instead the chip is actually "fir-type1"
"fir-type2" or something like that.

(FWIW, my signal processing textbook describes Type I, II, III, IV FIR filters
but doesn't say anything about "wideband" FIR filters.)

quoted

quoted

+		  and sharp transition band.
 
 What:		/sys/.../events/in_proximity_thresh_either_runningperiod
 KernelVersion:	6.6