linux-kernel - [PATCH v5 2/3] Documentation: ABI: sysfs-bus-counter: add capture items

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Date:   Wed, 17 Aug 2022 16:16:19 +0200
From:   Julien Panis <jpanis@...libre.com>
To:     william.gray@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, mranostay@...com,
        Julien Panis <jpanis@...libre.com>
Subject: [PATCH v5 2/3] Documentation: ABI: sysfs-bus-counter: add capture items

This commit adds capture items to counter ABI file
(e.g. TI ECAP used in capture operating mode).

Signed-off-by: Julien Panis <jpanis@...libre.com>
---
 Documentation/ABI/testing/sysfs-bus-counter | 49 +++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-counter b/Documentation/ABI/testing/sysfs-bus-counter
index 06c2b3e27e0b..52ddec7cc76a 100644
--- a/Documentation/ABI/testing/sysfs-bus-counter
+++ b/Documentation/ABI/testing/sysfs-bus-counter
@@ -203,6 +203,24 @@ Description:
 		both edges:
 			Any state transition.
 
+What:		/sys/bus/counter/devices/counterX/countY/count_cumul
+KernelVersion:	6.0
+Contact:	jpanis@...libre.com
+Description:
+		Read-only attribute that indicates the raw cumulated count
+		since count Y start, computed as follow:
+		count_cumul = (max_counter_val + 1) * nb_counter_overflows
+
+What:		/sys/bus/counter/devices/counterX/countY/captureZ
+KernelVersion:	6.0
+Contact:	jpanis@...libre.com
+Description:
+		Read-only attributes that indicate the last raw timestamp captured
+		for the respective capture Z register.
+		Raw timestamp can be converted to nanoseconds as follow:
+		time_ns = 10^9 * (captureZ + count_cumul) / frequency
+		count_cumul and frequency parameters are described in this document.
+
 What:		/sys/bus/counter/devices/counterX/countY/ceiling_component_id
 What:		/sys/bus/counter/devices/counterX/countY/floor_component_id
 What:		/sys/bus/counter/devices/counterX/countY/count_mode_component_id
@@ -213,6 +231,8 @@ What:		/sys/bus/counter/devices/counterX/countY/prescaler_component_id
 What:		/sys/bus/counter/devices/counterX/countY/preset_component_id
 What:		/sys/bus/counter/devices/counterX/countY/preset_enable_component_id
 What:		/sys/bus/counter/devices/counterX/countY/signalZ_action_component_id
+What:		/sys/bus/counter/devices/counterX/countY/count_cumul_component_id
+What:		/sys/bus/counter/devices/counterX/countY/captureZ_component_id
 What:		/sys/bus/counter/devices/counterX/signalY/cable_fault_component_id
 What:		/sys/bus/counter/devices/counterX/signalY/cable_fault_enable_component_id
 What:		/sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler_component_id
@@ -345,3 +365,32 @@ Description:
 			via index_polarity. The index function (as enabled via
 			preset_enable) is performed synchronously with the
 			quadrature clock on the active level of the index input.
+
+What:		/sys/bus/counter/devices/counterX/signalY/polarityZ
+KernelVersion:	6.0
+Contact:	jpanis@...libre.com
+Description:
+		Capture modules include N timestamp capture registers.
+		For all N sequenced timestamp capture events
+		(1->2->3->...->N->1->...), edge polarity can be selected.
+		The following polarities are available:
+
+		rising edge:
+			Low state transitions to high state.
+
+		falling edge:
+			High state transitions to low state.
+
+What:		/sys/bus/counter/devices/counterX/signalY/polarityZ_available
+KernelVersion:	6.0
+Contact:	jpanis@...libre.com
+Description:
+		Discrete set of available values for the respective polarity Z
+		configuration are listed in this file. Values are delimited by
+		newline characters.
+
+What:		/sys/bus/counter/devices/counterX/signalY/frequency
+KernelVersion:	6.0
+Contact:	jpanis@...libre.com
+Description:
+		Read-only attribute that indicates the signal Y frequency, in Hz.
-- 
2.25.1