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counter: Introduce the compare component

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Compare registers are used in devices to compare a counter channel
against a particular count value (e.g. to check if a threshold has been
reached). A macro COUNTER_COMP_COMPARE() is introduced to facilitate the
creation of compare components as Count extensions.

Link: https://lore.kernel.org/r/20250306-introduce-compare-component-v1-1-93993b3dca9c@kernel.org
Signed-off-by: William Breathitt Gray <wbg@kernel.org>
This commit is contained in:
William Breathitt Gray 2025-03-06 16:05:43 +09:00
parent 1adc6240a8
commit b519820193
2 changed files with 12 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-bus-counter
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@ -34,6 +34,14 @@ Contact: linux-iio@vger.kernel.org
Description:
Count data of Count Y represented as a string.
What: /sys/bus/counter/devices/counterX/countY/compare
KernelVersion: 6.15
Contact: linux-iio@vger.kernel.org
Description:
If the counter device supports compare registers -- registers
used to compare counter channels against a particular count --
the compare count for channel Y is provided by this attribute.
What: /sys/bus/counter/devices/counterX/countY/capture
KernelVersion: 6.1
Contact: linux-iio@vger.kernel.org
@ -301,6 +309,7 @@ Description:
What: /sys/bus/counter/devices/counterX/cascade_counts_enable_component_id
What: /sys/bus/counter/devices/counterX/external_input_phase_clock_select_component_id
What: /sys/bus/counter/devices/counterX/countY/compare_component_id
What: /sys/bus/counter/devices/counterX/countY/capture_component_id
What: /sys/bus/counter/devices/counterX/countY/ceiling_component_id
What: /sys/bus/counter/devices/counterX/countY/floor_component_id

3
include/linux/counter.h
View file

@ -580,6 +580,9 @@ struct counter_array {
#define COUNTER_COMP_CEILING(_read, _write) \
COUNTER_COMP_COUNT_U64("ceiling", _read, _write)
#define COUNTER_COMP_COMPARE(_read, _write) \
COUNTER_COMP_COUNT_U64("compare", _read, _write)
#define COUNTER_COMP_COUNT_MODE(_read, _write, _available) \
{ \
.type = COUNTER_COMP_COUNT_MODE, \