diff options
| author | William Breathitt Gray <vilhelm.gray@gmail.com> | 2019-04-02 15:30:41 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-25 21:33:39 +0200 |
| commit | 7e798ef90c5f7bf934b8a720eeafd0226c5394e7 (patch) | |
| tree | 06c6904d24072736b1753f0c346f405343721232 /Documentation/ABI/testing | |
| parent | f1d8a071d45bf13dd9bb9f1777133ca8a1cafebe (diff) | |
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@huawei.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI/testing')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-counter-104-quad-8 | 36 |
1 files changed, 36 insertions, 0 deletions
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. |