Re: [PATCH 09/10] iio: ABI: add integration_time for output channels

[Jonathan Cameron <jic23@kernel.org>]

On Thu, 15 Oct 2026 13:49:49 -0300
Rodrigo Alencar via B4 Relay <devnull+rodrigo.alencar.analog.com@kernel.org> wrote:

> From: Rodrigo Alencar <rodrigo.alencar@analog.com>
> 
> Document the integration_time attribute for output channels, which is
> the time interval during which the output is generated by integrating
> a quantity, such as its rate of change. It is the output counterpart of
> the integration_time already defined for input channels.
> Add entries for the altcurrent, frequency and phase channel types, which
> are going to be used by the AD9910 DDS driver.
> 
> Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-iio | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index 2b6f57041763..a41a96935cfb 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1744,6 +1744,23 @@ Description:
>  		seconds. If shared across all channels of a given type,
>  		<type>_integration_time is used.
>  
> +What:		/sys/bus/iio/devices/iio:deviceX/out_altcurrentY_integration_time
> +What:		/sys/bus/iio/devices/iio:deviceX/out_frequencyY_integration_time
> +What:		/sys/bus/iio/devices/iio:deviceX/out_phaseY_integration_time
> +KernelVersion:	7.4
> +Contact:	linux-iio@vger.kernel.org
> +Description:
> +		This attribute is used to get/set the integration time in
> +		seconds of an output channel, i.e., the time interval during
> +		which the output is generated by integrating (accumulating) a
> +		quantity over time, such as the rate of change (roc) of the
> +		channel. The output variation over this interval corresponds to
> +		the integral of that quantity, which may be bounded by limits
> +		configured through other channel attributes. The written value
> +		may be adjusted to the nearest interval supported by the
> +		hardware. If shared across all channels of a given type,
> +		<type>_integration_time is used.
Interesting adaption.  I wonder how often we will see this in drivers.
Works for me as I can't think what else integration time would mean
for outputs.

Jonathan

> +
>  What:		/sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_integration_time
>  KernelVersion:	4.0
>  Contact:	linux-iio@vger.kernel.org
>