linux-kernel - [PATCH 1/2] counter: Introduce the compare component

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Message-Id: <20250306-introduce-compare-component-v1-1-93993b3dca9c@kernel.org>
Date: Thu, 06 Mar 2025 16:05:43 +0900
From: William Breathitt Gray <wbg@...nel.org>
To: csokas.bence@...lan.hu, Kamel Bouhara <kamel.bouhara@...tlin.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 William Breathitt Gray <wbg@...nel.org>
Subject: [PATCH 1/2] counter: Introduce the compare component

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.

Signed-off-by: William Breathitt Gray <wbg@...nel.org>
---
 Documentation/ABI/testing/sysfs-bus-counter | 9 +++++++++
 include/linux/counter.h                     | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter
index 73ac84c0bca76e013f2534efc40c0f0e8d5fb023..3e8259e56d384225ec6e952b6d5d75208f185736 100644
--- a/Documentation/ABI/testing/sysfs-bus-counter
+++ b/Documentation/ABI/testing/sysfs-bus-counter
@@ -34,6 +34,14 @@ Contact:	linux-iio@...r.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@...r.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@...r.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
diff --git a/include/linux/counter.h b/include/linux/counter.h
index 426b7d58a438d59e5178bc5e76bac82e99737323..f208e867dd0f6995f58cf6a41c67538dad6428d0 100644
--- a/include/linux/counter.h
+++ b/include/linux/counter.h
@@ -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, \

-- 
2.48.1