[V3 0/4] Add PPS generators

[Rodolfo Giometti]

PPS generators are special hardware which are able to produce PPS
(Pulse Per Second) signals.

This patchset adds PPS generators class in order to have a well-defined
interface for these devices.

Changelog:

V2 -> V3:
    * KernelVersion entry added to the Documentation ABI
    * spelling and/or syntax errors fixed

V1 -> V2:
    * new file Documentation/ABI/testing/sysfs-pps-gen added in MAINTAINERS
    * date for the documentation ABI set to v6.13 which will be released on 2025-02
    * removed documentation for non-existent sysfs "name" entry
    * spelling and/or syntax errors fixed

RFC -> V1:
    * char device reworked (get_device/set_device)
    * dummy driver has been moved in a separate patch
    * idr_ replaced with ida_* functions
    * fixes in include/uapi/linux/pps_gen.h
    * MAINTAINERS updated
    * new ioctl PPS_GEN_USESYSTEMCLOCK added
    * new ioctl PPS_GEN_FETCHEVENT added
    * .compat_ioctl dropped
    * WARN_ON() removed from pps_gen_cdev_release()
    * not needed pr_*() calls removed or replaced with dev_*()
    * more quite driver
    * name attribute dropped
    * white spaces removed

Rodolfo Giometti (4):
  drivers pps: add PPS generators support
  drivers pps/generators: add dummy PPS generator
  Documentation pps.rst: add PPS generators documentation
  Documentation ABI: add PPS generators documentation

 Documentation/ABI/testing/sysfs-pps-gen       |  43 +++
 Documentation/driver-api/pps.rst              |  40 ++
 .../userspace-api/ioctl/ioctl-number.rst      |   1 +
 MAINTAINERS                                   |   2 +
 drivers/pps/Makefile                          |   3 +-
 drivers/pps/generators/Kconfig                |  22 +-
 drivers/pps/generators/Makefile               |   4 +
 drivers/pps/generators/pps_gen-dummy.c        |  96 +++++
 drivers/pps/generators/pps_gen.c              | 344 ++++++++++++++++++
 drivers/pps/generators/sysfs.c                |  75 ++++
 include/linux/pps_gen_kernel.h                |  78 ++++
 include/uapi/linux/pps_gen.h                  |  37 ++
 12 files changed, 743 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-pps-gen
 create mode 100644 drivers/pps/generators/pps_gen-dummy.c
 create mode 100644 drivers/pps/generators/pps_gen.c
 create mode 100644 drivers/pps/generators/sysfs.c
 create mode 100644 include/linux/pps_gen_kernel.h
 create mode 100644 include/uapi/linux/pps_gen.h

-- 
2.34.1