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[RESEND PATCH v5 0/6] Add support for PWM input capture on STM32

This series adds support for capture to stm32-pwm driver.
Capture is based on DMAs.
- First two patches add support for requesting DMAs to MFD core
- Next three patches add support for capture to stm32-pwm driver
- This has been tested on stm32429i-eval board.

Changes in v5:
- update patch 2 (mfd: stm32-timers: add support for dmas)
  move stm32_timers_dma struct to header file,
  fix warning on dma_mapping_error().

Changes in v4:
- Lee's comments on patch 2 (mfd: stm32-timers: add support for dmas)
  Add kerneldoc header, better format comments.

Changes in v3:
- Dropped 2 precusor patches applied by Thierry in pwm tree:
  "pwm: stm32: fix, remove unused struct device"
  "pwm: stm32: protect common prescaler for all channels"
- Note: this series applies on top on pwm tree
- Implements Lee's comments on MFD part: rework stm32_timers_dma struct,
  exported routine prototype now use generic device struct, more
  various comments (see patch 2 changelog).

Resend v2:
- Add collected Acks

Changes in v2:
- Abstract DMA handling from child driver: move it to MFD core
- Rework pwm capture routines to adopt this change
- Comment on optional dma support, beautify DMAs probe

Fabrice Gasnier (6):
  dt-bindings: mfd: stm32-timers: add support for dmas
  mfd: stm32-timers: add support for dmas
  pwm: stm32: add capture support
  pwm: stm32: improve capture by tuning counter prescaler
  pwm: stm32: use input prescaler to improve period capture
  ARM: dts: stm32: Enable pwm3 input capture on stm32f429i-eval

 .../devicetree/bindings/mfd/stm32-timers.txt       |  20 ++
 arch/arm/boot/dts/stm32429i-eval.dts               |   3 +
 drivers/mfd/stm32-timers.c                         | 201 +++++++++++++++-
 drivers/pwm/pwm-stm32.c                            | 257 +++++++++++++++++++++
 include/linux/mfd/stm32-timers.h                   |  58 +++++
 5 files changed, 537 insertions(+), 2 deletions(-)