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iio:core: timestamping clock selection support

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Adds a new per-device sysfs attribute "current_timestamp_clock" to allow
userspace to select a particular POSIX clock for buffered samples and
events timestamping.

Following clocks, as listed in clock_gettime(2), are supported:
CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW,
CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and
CLOCK_TAI.

Signed-off-by: Gregor Boirie <[email protected]>
Acked-by: Sanchayan Maity <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
This commit is contained in:
Gregor Boirie 2016-03-09 19:05:49 +01:00 • committed by Jonathan Cameron
commit bc2b7dab62
69 changed files with 327 additions and 114 deletions
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7
Documentation/ABI/testing/sysfs-bus-iio
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@ -32,6 +32,13 @@ Description:
Description of the physical chip / device for device X.
Typically a part number.
What: /sys/bus/iio/devices/iio:deviceX/timestamp_clock
KernelVersion: 4.5
Contact: [email protected]
Description:
String identifying current posix clock used to timestamp
buffered samples and events for device X.
What: /sys/bus/iio/devices/iio:deviceX/sampling_frequency
What: /sys/bus/iio/devices/iio:deviceX/buffer/sampling_frequency
What: /sys/bus/iio/devices/triggerX/sampling_frequency