IIO timestamping clock selection support based on the following principles :
* selected timestamping clock is a per-device attribute which the userspace
may access through a sysfs file ;
* a single reference clock is used for both buffered samples and events of a
given device at the same time ;
* userspace may choose amongst the following subset of available POSIX clocks:
CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW, CLOCK_REALTIME_COARSE,
CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and CLOCK_TAI ;
* sample and event timestamps consistency with respect to clock changes is
ensured by rejecting the ability to select a new clock as long as an events
chrdev is opened or a buffered samples channel is enabled for a given device.
* no in-kernel API support since :
* consumers work synchronously in direct mode, i.e. timestamping may be
peformed using traditional kernel time keeping ;
* any given device can only feed a single timestamping channel to all
consumers.
Changes since v1:
* isolate clock setup from sysfs
* rename timestamping clock sysfs entry to "timestamp_clock"
* make the "timestamp_clock" file content a self-describing string
* merge all 3 patches into a single one
* cosmetics
* rebase onto IIO testing branch
Changes since v2:
* rename timestamping clock sysfs entry to "current_timestamp_clock" to allow a
futur refinement exposing available clocks through a
"timestamp_clock_available" sysfs entry
* rename clock ids (remove "CLOCK_" prefix + lower case)
* checkpatch'ed
* rebase onto IIO testing branch
Regards.
Gregor Boirie (1):
iio:core: timestamping clock selection support
Documentation/ABI/testing/sysfs-bus-iio | 7 +
Documentation/DocBook/iio.tmpl | 2 +-
drivers/iio/accel/bma180.c | 2 +-
drivers/iio/accel/bmc150-accel-core.c | 4 +-
drivers/iio/accel/kxcjk-1013.c | 2 +-
drivers/iio/accel/mma7455_core.c | 3 +-
drivers/iio/accel/mma8452.c | 4 +-
drivers/iio/accel/mma9551.c | 2 +-
drivers/iio/accel/mma9553.c | 2 +-
drivers/iio/adc/ad7291.c | 2 +-
drivers/iio/adc/ad7298.c | 2 +-
drivers/iio/adc/ad7476.c | 2 +-
drivers/iio/adc/ad7887.c | 2 +-
drivers/iio/adc/ad7923.c | 2 +-
drivers/iio/adc/ad799x.c | 4 +-
drivers/iio/adc/cc10001_adc.c | 2 +-
drivers/iio/adc/hi8435.c | 2 +-
drivers/iio/adc/ina2xx-adc.c | 6 +-
drivers/iio/adc/max1363.c | 5 +-
drivers/iio/adc/ti-ads1015.c | 3 +-
drivers/iio/adc/vf610_adc.c | 3 +-
drivers/iio/adc/xilinx-xadc-events.c | 4 +-
drivers/iio/chemical/atlas-ph-sensor.c | 2 +-
drivers/iio/dac/ad5421.c | 6 +-
drivers/iio/dac/ad5504.c | 2 +-
drivers/iio/dummy/iio_simple_dummy_buffer.c | 3 +-
drivers/iio/dummy/iio_simple_dummy_events.c | 2 +-
drivers/iio/gyro/bmg160_core.c | 30 ++--
drivers/iio/humidity/dht11.c | 16 +-
drivers/iio/iio_core.h | 3 +
drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c | 2 +-
drivers/iio/industrialio-core.c | 179 +++++++++++++++++++++-
drivers/iio/industrialio-event.c | 19 ++-
drivers/iio/industrialio-trigger.c | 2 +-
drivers/iio/light/acpi-als.c | 2 +-
drivers/iio/light/adjd_s311.c | 2 +-
drivers/iio/light/apds9300.c | 2 +-
drivers/iio/light/apds9960.c | 4 +-
drivers/iio/light/cm36651.c | 2 +-
drivers/iio/light/gp2ap020a00f.c | 8 +-
drivers/iio/light/isl29125.c | 2 +-
drivers/iio/light/lm3533-als.c | 2 +-
drivers/iio/light/ltr501.c | 7 +-
drivers/iio/light/opt3001.c | 4 +-
drivers/iio/light/stk3310.c | 2 +-
drivers/iio/light/tcs3414.c | 2 +-
drivers/iio/light/tcs3472.c | 2 +-
drivers/iio/light/tsl2563.c | 2 +-
drivers/iio/light/us5182d.c | 2 +-
drivers/iio/magnetometer/hmc5843_core.c | 2 +-
drivers/iio/magnetometer/mag3110.c | 2 +-
drivers/iio/pressure/mpl3115.c | 2 +-
drivers/iio/pressure/ms5611_core.c | 3 +-
drivers/iio/proximity/pulsedlight-lidar-lite-v2.c | 2 +-
drivers/iio/proximity/sx9500.c | 4 +-
drivers/staging/iio/accel/lis3l02dq_core.c | 2 +-
drivers/staging/iio/accel/sca3000_core.c | 2 +-
drivers/staging/iio/adc/ad7280a.c | 8 +-
drivers/staging/iio/adc/ad7606_ring.c | 3 +-
drivers/staging/iio/adc/ad7816.c | 3 +-
drivers/staging/iio/addac/adt7316.c | 4 +-
drivers/staging/iio/cdc/ad7150.c | 2 +-
drivers/staging/iio/light/tsl2x7x_core.c | 2 +-
include/linux/iio/iio.h | 22 ++-
64 files changed, 326 insertions(+), 115 deletions(-)
--
2.1.4
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