linux-kernel - Re: [PATCH 8/8] docs: counter: add edge_capture_unit

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Date:   Wed, 27 Oct 2021 17:26:38 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     David Lechner <david@...hnology.com>
Cc:     linux-iio@...r.kernel.org, Robert Nelson <robertcnelson@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] docs: counter: add edge_capture_unit_* attributes

On Sat, Oct 16, 2021 at 08:33:43PM -0500, David Lechner wrote:
> This adds documentation for new counter subsystem edge_capture_unit_*
> sysfs attributes.
> 
> Signed-off-by: David Lechner <david@...hnology.com>
> ---
>  Documentation/ABI/testing/sysfs-bus-counter | 37 +++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter
> index 78bb1a501007..6c192c8c2b55 100644
> --- a/Documentation/ABI/testing/sysfs-bus-counter
> +++ b/Documentation/ABI/testing/sysfs-bus-counter
> @@ -59,6 +59,7 @@ What:		/sys/bus/counter/devices/counterX/countY/error_noise_available
>  What:		/sys/bus/counter/devices/counterX/countY/function_available
>  What:		/sys/bus/counter/devices/counterX/countY/prescaler_available
>  What:		/sys/bus/counter/devices/counterX/countY/signalZ_action_available
> +What:		/sys/bus/counter/devices/counterX/edge_capture_unit_prescaler_available
>  What:		/sys/bus/counter/devices/counterX/latch_mode_available
>  What:		/sys/bus/counter/devices/counterX/signalY/index_polarity_available
>  What:		/sys/bus/counter/devices/counterX/signalY/synchronous_mode_available
> @@ -230,6 +231,10 @@ What:		/sys/bus/counter/devices/counterX/signalY/cable_fault_enable_component_id
>  What:		/sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler_component_id
>  What:		/sys/bus/counter/devices/counterX/signalY/index_polarity_component_id
>  What:		/sys/bus/counter/devices/counterX/signalY/synchronous_mode_component_id
> +What:		/sys/bus/counter/devices/edge_capture_unit_enable_component_id
> +What:		/sys/bus/counter/devices/edge_capture_unit_latched_period_component_id
> +What:		/sys/bus/counter/devices/edge_capture_unit_max_period_component_id
> +What:		/sys/bus/counter/devices/edge_capture_unit_prescaler_component_id
>  What:		/sys/bus/counter/devices/latch_mode_component_id
>  What:		/sys/bus/counter/devices/unit_timer_enable_component_id
>  What:		/sys/bus/counter/devices/unit_timer_period_component_id
> @@ -249,6 +254,38 @@ Description:
>  		shorter or equal to configured value are ignored. Value 0 means
>  		filter is disabled.
>  
> +What:		/sys/bus/counter/devices/edge_capture_unit_enable
> +KernelVersion:	5.16
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Read/write attribute that starts or stops the Edge Capture Unit.
> +		Valid values are boolean.
> +
> +What:		/sys/bus/counter/devices/edge_capture_unit_latched_period
> +KernelVersion:	5.16
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Latched period of the Edge Capture Unit represented as a string.
> +		The value is latched in based on the trigger selected by the
> +		counterX/latch_mode attribute. Units are nanoseconds.
> +
> +What:		/sys/bus/counter/devices/edge_capture_unit_max_period
> +KernelVersion:	5.16
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Read/write attribute that selects the maximum period that can
> +		be measured by the Edge Capture Unit. Units are nanoseconds.
> +
> +What:		/sys/bus/counter/devices/edge_capture_unit_prescaler
> +KernelVersion:	5.16
> +Contact:	linux-iio@...r.kernel.org
> +Description:
> +		Read/write attribute that selects the how the
> +		counterX/countY/count value is scaled coming in to the Edge
> +		Capture Unit. This acts like a clock divider, e.g. if a value
> +		of 4 is selected, the Edge Capture Unit will measure the period
> +		between every 4 counts.
> +

I'd like to see that naming for this made more generic if possible so
that other drivers can use these extensions in the future. For example,
instead of the "edge_capture_unit_*" prefix, perhaps "latched_count_*"
would be appropriate. Would this be feasible?

William Breathitt Gray

>  What:		/sys/bus/counter/devices/counterX/events_queue_size
>  KernelVersion:	5.16
>  Contact:	linux-iio@...r.kernel.org
> -- 
> 2.25.1
> 

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