linux-kernel - [PATCH v10 06/18] counter: 104-quad-8: Documentation: Add Generic Counter sysfs documentation

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Message-Id: <90ea2b39df0194bcf6389802c1b6e22decdf2f8f.1554184734.git.vilhelm.gray@gmail.com>
Date:   Tue,  2 Apr 2019 15:30:41 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     jic23@...nel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org, fabrice.gasnier@...com,
        benjamin.gaignard@...com, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, akpm@...ux-foundation.org, david@...hnology.com,
        robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        leoyang.li@....com, daniel.lezcano@...aro.org, tglx@...utronix.de,
        thierry.reding@...il.com, esben@...bendal.dk,
        linux-pwm@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        patrick.havelange@...ensium.com,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v10 06/18] counter: 104-quad-8: Documentation: Add Generic Counter sysfs documentation

This patch adds standard documentation for the Generic Counter interface
userspace sysfs attributes of the 104-QUAD-8 driver.

Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
 .../ABI/testing/sysfs-bus-counter-104-quad-8  | 36 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 37 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-counter-104-quad-8

diff --git a/Documentation/ABI/testing/sysfs-bus-counter-104-quad-8 b/Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
new file mode 100644
index 000000000000..46b1f33b2fce
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
@@ -0,0 +1,36 @@
+What:		/sys/bus/counter/devices/counterX/signalY/index_polarity
+KernelVersion:	5.2
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Active level of index input Signal Y; irrelevant in
+		non-synchronous load mode.
+
+What:		/sys/bus/counter/devices/counterX/signalY/index_polarity_available
+What:		/sys/bus/counter/devices/counterX/signalY/synchronous_mode_available
+KernelVersion:	5.2
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Discrete set of available values for the respective Signal Y
+		configuration are listed in this file.
+
+What:		/sys/bus/counter/devices/counterX/signalY/synchronous_mode
+KernelVersion:	5.2
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Configure the counter associated with Signal Y for
+		non-synchronous or synchronous load mode. Synchronous load mode
+		cannot be selected in non-quadrature (Pulse-Direction) clock
+		mode.
+
+		non-synchronous:
+			A logic low level is the active level at this index
+			input. The index function (as enabled via preset_enable)
+			is performed directly on the active level of the index
+			input.
+
+		synchronous:
+			Intended for interfacing with encoder Index output in
+			quadrature clock mode. The active level is configured
+			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.
diff --git a/MAINTAINERS b/MAINTAINERS
index 663e7a62752a..d3d93a5d3b10 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -272,6 +272,7 @@ ACCES 104-QUAD-8 DRIVER
 M:	William Breathitt Gray <vilhelm.gray@...il.com>
 L:	linux-iio@...r.kernel.org
 S:	Maintained
+F:	Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
 F:	Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8
 F:	drivers/counter/104-quad-8.c
 
-- 
2.21.0