linux-kernel - [PATCH v4 2/3] Documentation: ABI: add sysfs-bus-counter-ecap

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Date:   Wed, 10 Aug 2022 16:07:23 +0200
From:   Julien Panis <jpanis@...libre.com>
To:     vilhelm.gray@...il.com, 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 v4 2/3] Documentation: ABI: add sysfs-bus-counter-ecap

This commit adds an ABI file for TI ECAP used in capture operating mode.

Signed-off-by: Julien Panis <jpanis@...libre.com>
---
 .../ABI/testing/sysfs-bus-counter-ecap        | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-counter-ecap

diff --git a/Documentation/ABI/testing/sysfs-bus-counter-ecap b/Documentation/ABI/testing/sysfs-bus-counter-ecap
new file mode 100644
index 000000000000..ca530a6806de
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-counter-ecap
@@ -0,0 +1,64 @@
+What:		/sys/bus/counter/devices/counter0/signal0/polarity1
+What:		/sys/bus/counter/devices/counter0/signal0/polarity2
+What:		/sys/bus/counter/devices/counter0/signal0/polarity3
+What:		/sys/bus/counter/devices/counter0/signal0/polarity4
+KernelVersion:	5.19
+Contact:	jpanis@...libre.com
+Description:
+		ECAP module includes 4 timestamp capture registers.
+		For all 4 sequenced timestamp capture events (1->2->3->4->1->...),
+		edge polarity can be selected. Then, each capture register can be
+		tuned to capture event by either:
+
+		- "rising"
+		- "falling"
+
+		Reading returns current trigger polarity.
+
+		Writing value before enabling capture sets trigger polarity.
+
+What:		/sys/bus/counter/devices/counter0/signal0/polarity1_available
+What:		/sys/bus/counter/devices/counter0/signal0/polarity2_available
+What:		/sys/bus/counter/devices/counter0/signal0/polarity3_available
+What:		/sys/bus/counter/devices/counter0/signal0/polarity4_available
+KernelVersion:	5.19
+Contact:	jpanis@...libre.com
+Description:
+		Discrete set of available values for the respective polarity X
+		configuration are listed in this file. Values are delimited by
+		newline characters.
+
+What:		/sys/bus/counter/devices/counter0/count0/enable
+KernelVersion:	5.19
+Contact:	jpanis@...libre.com
+Description:
+		Whether ECAP is enabled. Valid attribute values are boolean.
+
+		This attribute is intended to serve as a start/stop mechanism
+		for ECAP.
+
+What:		/sys/bus/counter/devices/counter0/count0/count
+KernelVersion:	5.19
+Contact:	jpanis@...libre.com
+Description:
+		Read-only attribute that indicates the current base counter value.
+
+What:		/sys/bus/counter/devices/counter0/count0/capture1
+What:		/sys/bus/counter/devices/counter0/count0/capture2
+What:		/sys/bus/counter/devices/counter0/count0/capture3
+What:		/sys/bus/counter/devices/counter0/count0/capture4
+KernelVersion:	5.19
+Contact:	jpanis@...libre.com
+Description:
+		Read-only attributes that indicate the last timestamp captured
+		for the respective capture X register.
+
+What:		/sys/bus/counter/devices/counter0/count0/capture1_component_id
+What:		/sys/bus/counter/devices/counter0/count0/capture2_component_id
+What:		/sys/bus/counter/devices/counter0/count0/capture3_component_id
+What:		/sys/bus/counter/devices/counter0/count0/capture4_component_id
+KernelVersion:	5.19
+Contact:	jpanis@...libre.com
+Description:
+		Read-only attributes that indicate the component ID of the
+		respective extension or synapse.
-- 
2.25.1