[RESEND,v3,0/9] Add STM32 LPTimer: PWM, trigger and counter

This series adds support for Low-Power Timer that can be found on
some STM32 devices.

STM32 LPTimer (LPTIM) is a 16-bit timer that provides several
functionalities. This series adds support for following features:
- PWM output (with programmable prescaler, configurable polarity)
- Trigger source for STM32 ADC or DAC (LPTIM_OUT)
- Quadrature encoder and counter

The MFD core is used to manage common resources (clock, register map)
and to detect encoder feature. "stm32_lptimer" structure is provided
to its sub-nodes to share those information:
- PWM driver is used to implement single PWM channel
- IIO trigger
- IIO quadrature encoder and counter

---
Resend v3 with collected Acks

Changes in v3:
- I sent this v3 with various changes, but still need to discuss ABI
  for counter driver (no change on this in v3).
- Remarks for Rob on dt-bindings
- Add validate_device in Trigger driver
- Update PWM driver after Thierry's comments
- Additional patch for STM32 ADC trigger

Changes in v2:
- Various remarks from Lee, on MFD part, extended to the full series,
  such as: clock name, use "Low-Power Timer", file headers, dt-bindings
  props descriptions, fix dt example.

Fabrice Gasnier (9):
  dt-bindings: mfd: Add STM32 LPTimer binding
  mfd: Add STM32 LPTimer driver
  dt-bindings: pwm: Add STM32 LPTimer PWM binding
  pwm: Add STM32 LPTimer PWM driver
  dt-bindings: iio: Add STM32 LPTimer trigger binding
  iio: trigger: Add STM32 LPTimer trigger driver
  dt-bindings: iio: Add STM32 LPTimer quadrature encoder and counter
  iio: counter: Add support for STM32 LPTimer
  iio: adc: stm32: add support for lptimer triggers

 .../ABI/testing/sysfs-bus-iio-lptimer-stm32        |  57 +++
 .../bindings/iio/counter/stm32-lptimer-cnt.txt     |  27 ++
 .../bindings/iio/timer/stm32-lptimer-trigger.txt   |  23 ++
 .../devicetree/bindings/mfd/stm32-lptimer.txt      |  48 +++
 .../devicetree/bindings/pwm/pwm-stm32-lp.txt       |  24 ++
 drivers/iio/adc/stm32-adc.c                        |  14 +-
 drivers/iio/counter/Kconfig                        |   9 +
 drivers/iio/counter/Makefile                       |   1 +
 drivers/iio/counter/stm32-lptimer-cnt.c            | 383 +++++++++++++++++++++
 drivers/iio/trigger/Kconfig                        |  11 +
 drivers/iio/trigger/Makefile                       |   1 +
 drivers/iio/trigger/stm32-lptimer-trigger.c        | 118 +++++++
 drivers/mfd/Kconfig                                |  14 +
 drivers/mfd/Makefile                               |   1 +
 drivers/mfd/stm32-lptimer.c                        | 107 ++++++
 drivers/pwm/Kconfig                                |  10 +
 drivers/pwm/Makefile                               |   1 +
 drivers/pwm/pwm-stm32-lp.c                         | 246 +++++++++++++
 include/linux/iio/timer/stm32-lptim-trigger.h      |  27 ++
 include/linux/mfd/stm32-lptimer.h                  |  62 ++++
 20 files changed, 1182 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32
 create mode 100644 Documentation/devicetree/bindings/iio/counter/stm32-lptimer-cnt.txt
 create mode 100644 Documentation/devicetree/bindings/iio/timer/stm32-lptimer-trigger.txt
 create mode 100644 Documentation/devicetree/bindings/mfd/stm32-lptimer.txt
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-stm32-lp.txt
 create mode 100644 drivers/iio/counter/stm32-lptimer-cnt.c
 create mode 100644 drivers/iio/trigger/stm32-lptimer-trigger.c
 create mode 100644 drivers/mfd/stm32-lptimer.c
 create mode 100644 drivers/pwm/pwm-stm32-lp.c
 create mode 100644 include/linux/iio/timer/stm32-lptim-trigger.h
 create mode 100644 include/linux/mfd/stm32-lptimer.h

On Mon, 28 Aug 2017, Fabrice Gasnier wrote:

> STM32 Low-Power Timer hardware block can be used for:
> - PWM generation
> - IIO trigger (in sync with PWM)
> - IIO quadrature encoder counter
> PWM and IIO timer configuration are mixed in the same registers so
> we need a multi fonction driver to be able to share those registers.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> ---
> Changes in v2:
> - Lee's remarks: various comments, max register define, s/Low Power/Low-Power,
>   clock name, removed reset, add kernel doc for stm32_lptimer struct
> ---
>  drivers/mfd/Kconfig               |  14 +++++
>  drivers/mfd/Makefile              |   1 +
>  drivers/mfd/stm32-lptimer.c       | 107 ++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/stm32-lptimer.h |  62 ++++++++++++++++++++++
>  4 files changed, 184 insertions(+)
>  create mode 100644 drivers/mfd/stm32-lptimer.c
>  create mode 100644 include/linux/mfd/stm32-lptimer.h

Acked-by: Lee Jones <lee.jones@linaro.org>