pwm: intel: Add PWM driver for a new SoC

Patch 1 adds dt binding document in YAML format. Patch 2 add PWM fan controller driver for LGM SoC.

v15:
- Rebase to latest linux 5.10-rc2

v14:
- Address below review concerns from Uwe Kleine-K�nig.
* Add limitations info about fixed 2-wire mode support.
* Rename clk/reset _disable function names to _release.
* Remove clk & rst from driver data structure. Instead use them as arguments.
* Add pwm_chip.base = -1.
- Resolve missing MODULE_LICENSE warning.

v13:
- Address below review concerns (Philipp Zabel)
* Make unnecessary 2 line comment as 1 line comment.
* Move reset_deassert at the last after clk_enable.
* Remove unnecessary return ret statement from .remove()
- Move platform_set_drvdata() at the top of probe.

v12:
- Rebase to linux 5.9-rc4
- Add Reviewed-by tags from Andy Shevchenko & Rob Herring.

v11:
- Address below review concerns (Andy Shevchenko)
* Fix a issue with dev_err_probe() usage & improve the usage.
* Fix & improve a ordering issue with clk_enable/disable & reset_control assert/deassert.

v10:
- Removed unused of_device.h and added platform_device.h & mod_devicetable.h

v9:
- Address code quality related review concerns (Andy Shevchenko)
- Use devm_add_action_or_reset() instead of explicit unwind calls.

v8:
- Remove fan related optional properties usage, keep them as default. If needed, change pwm-fan driver separately in future to add them as generic properties.

v7:
- Address code quality related review concerns.
- Rename fan related property to pwm-*.
- Fix one make dt_binding_check reported error.

v6:
- Readjust .apply op as per review feedback.
- Add back pwm-cells property to resolve make dt_binding_check error. pwm-cells is a required property for PWM driver.
- Add back fan related optional properties.

v5:
- Address below review concerns from Uwe Kleine-K�nig.
* Improve comments about Limitations.
* Use return value of regmap_update_bits if container function returns error code.
* Modify .apply op to have strict checking for fixed period supported by PWM HW.
* Use u64 as type when use min_t for duty_cycle.
* Add reset_control_assert() in failure case in probe where it was missing earlier.
- Remove fan specific optional properties from pwm dt binding document (Rob Herring)

v4:
- Address below review concerns from Uwe Kleine-K�nig.
* Improve notes and limitations comments.
* Add common prefixes for all #defines.
* Modify/Improve logic in .apply & .get_state ops as advised.
* Skip error messages in probe when error is -EPROBE_DEFER.
* Add dependencies in Kconfig (OF & HAS_IOMEM) and add select REGMAP_MMIO.
* Address other code quality related review concerns.
- Fix make dt_binding_check reported error in YAML file.

v3:
- Address below review concerns from Uwe Kleine-K�nig.
* Remove fan rpm calibration task from the driver.
* Modify apply op as per the review feedback.
* Add roundup & round down where necessary.
* Address other misc code quality related review concerns.
* Use devm_reset_control_get_exclusive(). (Philipp Zabel)
* Improve dt binding document.

v2:
- Address below review concerns from Uwe Kleine-K�nig.
* Add notes and limitations about PWM HW.
* Rename all functions and structure to lgm_pwm_*
* Readjust space aligninment in structure fields to single space.
* Switch to using apply instead of config/enable/disable.
* Address other code quality related concerns.
* Rebase to 5.8-rc1.
- Address review concerns in dt binding YAML from Rob Herring.

v1:
- Initial version.

Rahul Tanwar (2):
Add DT bindings YAML schema for PWM fan controller of LGM SoC Add PWM fan controller driver for LGM SoC

 .../devicetree/bindings/pwm/intel,lgm-pwm.yaml     |  44 ++++
 drivers/pwm/Kconfig                                |  11 +
 drivers/pwm/Makefile                               |   1 +
 drivers/pwm/pwm-intel-lgm.c                        | 244 +++++++++++++++++++++
 4 files changed, 300 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/intel,lgm-pwm.yaml
 create mode 100644 drivers/pwm/pwm-intel-lgm.c

2.11.0