mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 18:56:42 +07:00
ea2b23b895
This patch adds standard documentation for the userspace sysfs attributes of the Generic Counter interface. Reviewed-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>
231 lines
7.9 KiB
Plaintext
231 lines
7.9 KiB
Plaintext
What: /sys/bus/counter/devices/counterX/countY/count
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Count data of Count Y represented as a string.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/ceiling
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Count value ceiling for Count Y. This is the upper limit for the
|
|
respective counter.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/floor
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Count value floor for Count Y. This is the lower limit for the
|
|
respective counter.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/count_mode
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Count mode for channel Y. The ceiling and floor values for
|
|
Count Y are used by the count mode where required. The following
|
|
count modes are available:
|
|
|
|
normal:
|
|
Counting is continuous in either direction.
|
|
|
|
range limit:
|
|
An upper or lower limit is set, mimicking limit switches
|
|
in the mechanical counterpart. The upper limit is set to
|
|
the Count Y ceiling value, while the lower limit is set
|
|
to the Count Y floor value. The counter freezes at
|
|
count = ceiling when counting up, and at count = floor
|
|
when counting down. At either of these limits, the
|
|
counting is resumed only when the count direction is
|
|
reversed.
|
|
|
|
non-recycle:
|
|
The counter is disabled whenever a counter overflow or
|
|
underflow takes place. The counter is re-enabled when a
|
|
new count value is loaded to the counter via a preset
|
|
operation or direct write.
|
|
|
|
modulo-n:
|
|
A count value boundary is set between the Count Y floor
|
|
value and the Count Y ceiling value. The counter is
|
|
reset to the Count Y floor value at count = ceiling when
|
|
counting up, while the counter is set to the Count Y
|
|
ceiling value at count = floor when counting down; the
|
|
counter does not freeze at the boundary points, but
|
|
counts continuously throughout.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/count_mode_available
|
|
What: /sys/bus/counter/devices/counterX/countY/error_noise_available
|
|
What: /sys/bus/counter/devices/counterX/countY/function_available
|
|
What: /sys/bus/counter/devices/counterX/countY/signalZ_action_available
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Discrete set of available values for the respective Count Y
|
|
configuration are listed in this file. Values are delimited by
|
|
newline characters.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/direction
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Read-only attribute that indicates the count direction of Count
|
|
Y. Two count directions are available: forward and backward.
|
|
|
|
Some counter devices are able to determine the direction of
|
|
their counting. For example, quadrature encoding counters can
|
|
determine the direction of movement by evaluating the leading
|
|
phase of the respective A and B quadrature encoding signals.
|
|
This attribute exposes such count directions.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/enable
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Whether channel Y counter is enabled. Valid attribute values are
|
|
boolean.
|
|
|
|
This attribute is intended to serve as a pause/unpause mechanism
|
|
for Count Y. Suppose a counter device is used to count the total
|
|
movement of a conveyor belt: this attribute allows an operator
|
|
to temporarily pause the counter, service the conveyor belt,
|
|
and then finally unpause the counter to continue where it had
|
|
left off.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/error_noise
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Read-only attribute that indicates whether excessive noise is
|
|
present at the channel Y counter inputs.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/function
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Count function mode of Count Y; count function evaluation is
|
|
triggered by conditions specified by the Count Y signalZ_action
|
|
attributes. The following count functions are available:
|
|
|
|
increase:
|
|
Accumulated count is incremented.
|
|
|
|
decrease:
|
|
Accumulated count is decremented.
|
|
|
|
pulse-direction:
|
|
Rising edges on signal A updates the respective count.
|
|
The input level of signal B determines direction.
|
|
|
|
quadrature x1 a:
|
|
If direction is forward, rising edges on quadrature pair
|
|
signal A updates the respective count; if the direction
|
|
is backward, falling edges on quadrature pair signal A
|
|
updates the respective count. Quadrature encoding
|
|
determines the direction.
|
|
|
|
quadrature x1 b:
|
|
If direction is forward, rising edges on quadrature pair
|
|
signal B updates the respective count; if the direction
|
|
is backward, falling edges on quadrature pair signal B
|
|
updates the respective count. Quadrature encoding
|
|
determines the direction.
|
|
|
|
quadrature x2 a:
|
|
Any state transition on quadrature pair signal A updates
|
|
the respective count. Quadrature encoding determines the
|
|
direction.
|
|
|
|
quadrature x2 b:
|
|
Any state transition on quadrature pair signal B updates
|
|
the respective count. Quadrature encoding determines the
|
|
direction.
|
|
|
|
quadrature x4:
|
|
Any state transition on either quadrature pair signals
|
|
updates the respective count. Quadrature encoding
|
|
determines the direction.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/name
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Read-only attribute that indicates the device-specific name of
|
|
Count Y. If possible, this should match the name of the
|
|
respective channel as it appears in the device datasheet.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/preset
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
If the counter device supports preset registers -- registers
|
|
used to load counter channels to a set count upon device-defined
|
|
preset operation trigger events -- the preset count for channel
|
|
Y is provided by this attribute.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/preset_enable
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Whether channel Y counter preset operation is enabled. Valid
|
|
attribute values are boolean.
|
|
|
|
What: /sys/bus/counter/devices/counterX/countY/signalZ_action
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Action mode of Count Y for Signal Z. This attribute indicates
|
|
the condition of Signal Z that triggers the count function
|
|
evaluation for Count Y. The following action modes are
|
|
available:
|
|
|
|
none:
|
|
Signal does not trigger the count function. In
|
|
Pulse-Direction count function mode, this Signal is
|
|
evaluated as Direction.
|
|
|
|
rising edge:
|
|
Low state transitions to high state.
|
|
|
|
falling edge:
|
|
High state transitions to low state.
|
|
|
|
both edges:
|
|
Any state transition.
|
|
|
|
What: /sys/bus/counter/devices/counterX/name
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Read-only attribute that indicates the device-specific name of
|
|
the Counter. This should match the name of the device as it
|
|
appears in its respective datasheet.
|
|
|
|
What: /sys/bus/counter/devices/counterX/num_counts
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Read-only attribute that indicates the total number of Counts
|
|
belonging to the Counter.
|
|
|
|
What: /sys/bus/counter/devices/counterX/num_signals
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Read-only attribute that indicates the total number of Signals
|
|
belonging to the Counter.
|
|
|
|
What: /sys/bus/counter/devices/counterX/signalY/signal
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Signal data of Signal Y represented as a string.
|
|
|
|
What: /sys/bus/counter/devices/counterX/signalY/name
|
|
KernelVersion: 5.2
|
|
Contact: linux-iio@vger.kernel.org
|
|
Description:
|
|
Read-only attribute that indicates the device-specific name of
|
|
Signal Y. If possible, this should match the name of the
|
|
respective signal as it appears in the device datasheet.
|