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Documentation ABI: add PPS generators documentation

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This patch adds the documentation for the ABI between the Linux kernel
and userspace regarding the PPS generators.

Signed-off-by: Rodolfo Giometti <giometti@enneenne.com>
Link: https://lore.kernel.org/r/20241108073115.759039-5-giometti@enneenne.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rodolfo Giometti 2024-11-08 08:31:15 +01:00 committed by Greg Kroah-Hartman
parent b14aea0ce0
commit b3b9b3cccb
2 changed files with 44 additions and 0 deletions
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Documentation/ABI/testing/sysfs-pps-gen Normal file
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What: /sys/class/pps-gen/
Date: February 2025
KernelVersion: 6.13
Contact: Rodolfo Giometti <giometti@enneenne.com>
Description:
The /sys/class/pps-gen/ directory contains files and
directories that provide a unified interface to the PPS
generators.
What: /sys/class/pps-gen/pps-genX/
Date: February 2025
KernelVersion: 6.13
Contact: Rodolfo Giometti <giometti@enneenne.com>
Description:
The /sys/class/pps-gen/pps-genX/ directory is related to X-th
PPS generator in the system. Each directory contain files to
manage and control its PPS generator.
What: /sys/class/pps-gen/pps-genX/enable
Date: February 2025
KernelVersion: 6.13
Contact: Rodolfo Giometti <giometti@enneenne.com>
Description:
This write-only file enables or disables generation of the
PPS signal.
What: /sys/class/pps-gen/pps-genX/system
Date: February 2025
KernelVersion: 6.13
Contact: Rodolfo Giometti <giometti@enneenne.com>
Description:
This read-only file returns "1" if the generator takes the
timing from the system clock, while it returns "0" if not
(i.e. from a peripheral device clock).
What: /sys/class/pps-gen/pps-genX/time
Date: February 2025
KernelVersion: 6.13
Contact: Rodolfo Giometti <giometti@enneenne.com>
Description:
This read-only file contains the current time stored into the
generator clock as two integers representing the current time
seconds and nanoseconds.

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MAINTAINERS
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@ -18715,6 +18715,7 @@ L: linuxpps@ml.enneenne.com (subscribers-only)
S: Maintained
W: http://wiki.enneenne.com/index.php/LinuxPPS_support
F: Documentation/ABI/testing/sysfs-pps
F: Documentation/ABI/testing/sysfs-pps-gen
F: Documentation/devicetree/bindings/pps/pps-gpio.yaml
F: Documentation/driver-api/pps.rst
F: drivers/pps/