[PATCH v6 0/2] PWM support for HiFive Unleashed

[Yash Shah <yash.shah@sifive.com>]

This patch series adds a PWM driver and DT documentation
for HiFive Unleashed board. The patches are mostly based on
Wesley's patch.

v6
- Remove the global property 'sifive,period-ns'
- Implement free and request callbacks to maintain user counts.
- Add user_count member to struct pwm_sifive_ddata
- Allow period change only if user_count is one
- Add pwm_sifive_enable function to enable/disable PWM
- Change calculation logic of frac (in pwm_sifive_apply)
- Remove state correction
- Remove pwm_sifive_xlate function
- Clock to be enabled only when PWM is enabled
- Other minor fixes

v5
- Correct the order of compatible string properties
- PWM state correction to be done always
- Other minor fixes based upon feedback on v4

v4
- Rename the property sifive,approx-period-ns to sifive,period-ns
- Rename macros with appropriate names
- Remove unused macros
- Rename struct sifive_pwm_device to struct pwm_sifive_ddata
- Rename function prefix as per driver name
- Set deglitch bit before changing output waveform.
- Other minor fixes based upon feedback on v3

v3
- Add a link to the reference manaul
- Use appropriate apis for division operation
- Add check for polarity
- Enable clk before calling clk_get_rate
- Other minor fixes based upon feedback on v2

V2 changed from V1:
- Remove inclusion of dt-bindings/pwm/pwm.h
- Remove artificial alignments
- Replace ioread32/iowrite32 with readl/writel
- Remove camelcase
- Change dev_info to dev_dbg for unnecessary log
- Correct typo in driver name
- Remove use of of_match_ptr macro
- Update the DT compatible strings and Add reference to a common
  versioning document

Yash Shah (2):
  pwm: sifive: Add DT documentation for SiFive PWM Controller
  pwm: sifive: Add a driver for SiFive SoC PWM

 .../devicetree/bindings/pwm/pwm-sifive.txt         |  30 ++
 drivers/pwm/Kconfig                                |  11 +
 drivers/pwm/Makefile                               |   1 +
 drivers/pwm/pwm-sifive.c                           | 311 +++++++++++++++++++++
 4 files changed, 353 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/pwm-sifive.txt
 create mode 100644 drivers/pwm/pwm-sifive.c

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1.9.1