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Subject[PATCH v6 5/9] counter: 104-quad-8: Documentation: Add Generic Counter sysfs documentation
Date
This patch adds standard documentation for the Generic Counter interface
userspace sysfs attributes of the 104-QUAD-8 driver.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.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..274df6768b97
--- /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: 4.18
+Contact: linux-iio@vger.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: 4.18
+Contact: linux-iio@vger.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: 4.18
+Contact: linux-iio@vger.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 f11bf7885aeb..8e27b49e8d5e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -270,6 +270,7 @@ ACCES 104-QUAD-8 DRIVER
M: William Breathitt Gray <vilhelm.gray@gmail.com>
L: linux-iio@vger.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

--
2.17.0
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