From 7e798ef90c5f7bf934b8a720eeafd0226c5394e7 Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Tue, 2 Apr 2019 15:30:41 +0900 Subject: 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 Signed-off-by: William Breathitt Gray Signed-off-by: Greg Kroah-Hartman --- .../ABI/testing/sysfs-bus-counter-104-quad-8 | 36 ++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-bus-counter-104-quad-8 (limited to 'Documentation/ABI') 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@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: 5.2 +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: 5.2 +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. -- cgit