Introduce the Counter subsystem

Changes in v10:
- Fix minor typographical errors in documentation
- Merge the FlexTimer Module Quadrature decoder counter driver patches

This revision is functionally identical to the last; changes in this version were made to fix minor typos in the documentation files and also to pull in the new FTM quadrature decoder counter driver.

The Generic Counter API has been and is still in a feature freeze until it is merged into the mainline. The following features will be investigated after the merge: interrupt support for counter devices, and a character device interface for low-latency applications.

Benjamin Gaignard (2):
counter: Add STM32 Timer quadrature encoder
dt-bindings: counter: Document stm32 quadrature encoder

Fabrice Gasnier (2):
counter: stm32-lptimer: add counter device
dt-bindings: counter: Adjust dt-bindings for STM32 lptimer move

Patrick Havelange (7):
include/fsl: add common FlexTimer #defines in a separate header. drivers/pwm: pwm-fsl-ftm: use common header for FlexTimer #defines drivers/clocksource: timer-fsl-ftm: use common header for FlexTimer

    #defines

dt-bindings: counter: ftm-quaddec
counter: add FlexTimer Module Quadrature decoder counter driver
counter: ftm-quaddec: Documentation: Add specific counter sysfs
documentation
LS1021A: dtsi: add ftm quad decoder entries

William Breathitt Gray (7):
counter: Introduce the Generic Counter interface
counter: Documentation: Add Generic Counter sysfs documentation
docs: Add Generic Counter interface documentation
iio: 104-quad-8: Update license boilerplate
counter: 104-quad-8: Add Generic Counter interface support
counter: 104-quad-8: Documentation: Add Generic Counter sysfs
documentation
iio: counter: Add deprecation markings for IIO Counter attributes

 Documentation/ABI/testing/sysfs-bus-counter   |  230 +++
 .../ABI/testing/sysfs-bus-counter-104-quad-8  |   36 +
 .../ABI/testing/sysfs-bus-counter-ftm-quaddec |   16 +
 Documentation/ABI/testing/sysfs-bus-iio       |    8 +
 .../testing/sysfs-bus-iio-counter-104-quad-8  |   16 +
 .../bindings/counter/ftm-quaddec.txt          |   18 +
 .../{iio => }/counter/stm32-lptimer-cnt.txt   |    0
 .../bindings/counter/stm32-timer-cnt.txt      |   31 +
 .../devicetree/bindings/mfd/stm32-lptimer.txt |    2 +-
 .../devicetree/bindings/mfd/stm32-timers.txt  |    7 +
 Documentation/driver-api/generic-counter.rst  |  342 ++++
 Documentation/driver-api/index.rst            |    1 +
 MAINTAINERS                                   |   15 +-
 arch/arm/boot/dts/ls1021a.dtsi                |   28 +
 drivers/Kconfig                               |    2 +
 drivers/Makefile                              |    1 +
 drivers/clocksource/timer-fsl-ftm.c           |   15 +-
 drivers/{iio => }/counter/104-quad-8.c        |  782 +++++++-
 drivers/counter/Kconfig                       |   60 +
 drivers/counter/Makefile                      |   10 +
 drivers/counter/counter.c                     | 1567 +++++++++++++++++
 drivers/counter/ftm-quaddec.c                 |  356 ++++
 drivers/{iio => }/counter/stm32-lptimer-cnt.c |  361 +++-
 drivers/counter/stm32-timer-cnt.c             |  390 ++++
 drivers/iio/Kconfig                           |    1 -
 drivers/iio/Makefile                          |    1 -
 drivers/iio/counter/Kconfig                   |   34 -
 drivers/iio/counter/Makefile                  |    8 -
 drivers/pwm/pwm-fsl-ftm.c                     |   44 +-
 include/linux/counter.h                       |  510 ++++++
 include/linux/counter_enum.h                  |   45 +
 include/linux/fsl/ftm.h                       |   88 +
 32 files changed, 4877 insertions(+), 148 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-counter
 create mode 100644 Documentation/ABI/testing/sysfs-bus-counter-104-quad-8
 create mode 100644 Documentation/ABI/testing/sysfs-bus-counter-ftm-quaddec
 create mode 100644 Documentation/devicetree/bindings/counter/ftm-quaddec.txt
 rename Documentation/devicetree/bindings/{iio => }/counter/stm32-lptimer-cnt.txt (100%)
 create mode 100644 Documentation/devicetree/bindings/counter/stm32-timer-cnt.txt
 create mode 100644 Documentation/driver-api/generic-counter.rst
 rename drivers/{iio => }/counter/104-quad-8.c (44%)
 create mode 100644 drivers/counter/Kconfig
 create mode 100644 drivers/counter/Makefile
 create mode 100644 drivers/counter/counter.c
 create mode 100644 drivers/counter/ftm-quaddec.c
 rename drivers/{iio => }/counter/stm32-lptimer-cnt.c (51%)
 create mode 100644 drivers/counter/stm32-timer-cnt.c
 delete mode 100644 drivers/iio/counter/Kconfig
 delete mode 100644 drivers/iio/counter/Makefile
 create mode 100644 include/linux/counter.h
 create mode 100644 include/linux/counter_enum.h
 create mode 100644 include/linux/fsl/ftm.h

2.21.0