[PATCH v4 0/3] Add PM support to STM32 LP Timer drivers

[Fabrice Gasnier <fabrice.gasnier@st.com>]

This patch series adds power management support for STM32 LP Timer:
- PWM driver
- Document the pinctrl states for sleep mode

It also adds device link between the PWM consumer and the PWM provider.
This allows proper sequencing for suspend/resume (e.g. user will likely
do a pwm_disable() before the PWM provider suspend executes), see [1].

[1] https://lkml.org/lkml/2019/2/5/770

---
Changes in v4:
- improve error handling when adding the PWM consumer device link.

Changes in v3:
- Move the device_link_add() call to of_pwm_get() as discussed with Uwe.

Changes in v2:
- Don't disable PWM channel in PWM provider: rather refuse to suspend
  and report an error as suggested by Uwe and Thierry.
- Add patch 3/3 to propose device link addition.
- No updates for STM32 LP Timer IIO driver. Patches can be send separately.

Fabrice Gasnier (3):
  dt-bindings: pwm-stm32-lp: document pinctrl sleep state
  pwm: stm32-lp: Add power management support
  pwm: core: add consumer device link

 .../devicetree/bindings/pwm/pwm-stm32-lp.txt       |  9 ++--
 drivers/pwm/core.c                                 | 50 ++++++++++++++++++++--
 drivers/pwm/pwm-stm32-lp.c                         | 25 +++++++++++
 include/linux/pwm.h                                |  6 ++-
 4 files changed, 82 insertions(+), 8 deletions(-)

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1.9.1