[PATCH v8 0/6] Add mfd, pinctrl and pwm support to EN7581 SoC

[Lorenzo Bianconi <lorenzo@kernel.org>]

Introduce airoha-mfd driver in order to load pinctrl and pwm drivers for
EN7581 SoC. airoha-mfd is needed since both pinctrl and pwm drivers
needs to access the same memory block (gpio memory region) to configure
{gio,irq}_chip and pwm functionalities respectively, so model them as
childs of a parent mfd driver.
Current EN7581 pinctrl driver supports the following functionalities:
- pin multiplexing via chip_scu syscon
- pin pull-up, pull-down, open-drain, current strength,
  {input,output}_enable, output_{low,high} via chip_scu syscon
- gpio controller
- irq controller

---
Changes in v8:
- pwm: add missing properties documentation
- Link to v7: https://lore.kernel.org/r/20241016-en7581-pinctrl-v7-0-4ff611f263a7@kernel.org

Changes in v7:
- pinctrl: cosmetics
- pinctrl: fix compilation warning
- Link to v6: https://lore.kernel.org/r/20241013-en7581-pinctrl-v6-0-2048e2d099c2@kernel.org

Changes in v6:
- pwm: rely on regmap APIs
- pwm: introduce compatible string
- pinctrl: introduce compatible string
- remove airoha-mfd driver
- add airoha,en7581-pinctrl binding
- add airoha,en7581-pwm binding
- update airoha,en7581-gpio-sysctl binding
- Link to v5: https://lore.kernel.org/r/20241001-en7581-pinctrl-v5-0-dc1ce542b6c6@kernel.org

Changes in v5:
- use spin_lock in airoha_pinctrl_rmw instead of a mutex since it can run
  in interrupt context
- remove unused includes in pinctrl driver
- since the irq_chip is immutable, allocate the gpio_irq_chip struct
  statically in pinctrl driver
- rely on regmap APIs in pinctrl driver but keep the spin_lock local to the
  driver
- rely on guard/guard_scope APIs in pinctrl driver
- improve naming convention pinctrl driver
- introduce airoha_pinconf_set_pin_value utility routine
- Link to v4: https://lore.kernel.org/r/20240911-en7581-pinctrl-v4-0-60ac93d760bb@kernel.org

Changes in v4:
- add 'Limitation' description in pwm driver
- fix comments in pwm driver
- rely on mfd->base __iomem pointer in pwm driver, modify register
  offsets according to it and get rid of sgpio_cfg, flash_cfg and
  cycle_cfg pointers
- simplify register utility routines in pwm driver
- use 'generator' instead of 'waveform' suffix for pwm routines
- fix possible overflow calculating duty cycle in pwm driver
- do not modify pwm state in free callback in pwm driver
- cap the maximum period in pwm driver
- do not allow inverse polarity in pwm driver
- do not set of_xlate callback in the pwm driver and allow the stack to
  do it
- fix MAINTAINERS file for airoha pinctrl driver
- fix undefined reference to __ffsdi2 in pinctrl driver
- simplify airoha,en7581-gpio-sysctl.yam binding
- Link to v3: https://lore.kernel.org/r/20240831-en7581-pinctrl-v3-0-98eebfb4da66@kernel.org

Changes in v3:
- introduce airoha-mfd driver
- add pwm driver to the same series
- model pinctrl and pwm drivers as childs of a parent mfd driver.
- access chip-scu memory region in pinctrl driver via syscon
- introduce a single airoha,en7581-gpio-sysctl.yaml binding and get rid
  of dedicated bindings for pinctrl and pwm
- add airoha,en7581-chip-scu.yaml binding do the series
- Link to v2: https://lore.kernel.org/r/20240822-en7581-pinctrl-v2-0-ba1559173a7f@kernel.org

Changes in v2:
- Fix compilation errors
- Collapse some register mappings for gpio and irq controllers
- update dt-bindings according to new register mapping
- fix some dt-bindings errors
- Link to v1: https://lore.kernel.org/all/cover.1723392444.git.lorenzo@kernel.org/

---
Benjamin Larsson (1):
      pwm: airoha: Add support for EN7581 SoC

Christian Marangi (1):
      dt-bindings: mfd: Add support for Airoha EN7581 GPIO System Controller

Lorenzo Bianconi (4):
      dt-bindings: arm: airoha: Add the chip-scu node for EN7581 SoC
      dt-bindings: pinctrl: airoha: Add EN7581 pinctrl
      dt-bindings: pwm: airoha: Add EN7581 pwm
      pinctrl: airoha: Add support for EN7581 SoC

 .../bindings/arm/airoha,en7581-chip-scu.yaml       |   42 +
 .../bindings/mfd/airoha,en7581-gpio-sysctl.yaml    |   90 +
 .../bindings/pinctrl/airoha,en7581-pinctrl.yaml    |  400 +++
 .../devicetree/bindings/pwm/airoha,en7581-pwm.yaml |   61 +
 MAINTAINERS                                        |    7 +
 drivers/pinctrl/mediatek/Kconfig                   |   17 +-
 drivers/pinctrl/mediatek/Makefile                  |    1 +
 drivers/pinctrl/mediatek/pinctrl-airoha.c          | 2970 ++++++++++++++++++++
 drivers/pwm/Kconfig                                |   11 +
 drivers/pwm/Makefile                               |    1 +
 drivers/pwm/pwm-airoha.c                           |  421 +++
 11 files changed, 4020 insertions(+), 1 deletion(-)
---
base-commit: e4188772459fec428bf85ce6711a0147387c1455
change-id: 20240818-en7581-pinctrl-1bf120154be0
prerequisite-change-id: 20240705-for-6-11-bpf-a349efc08df8:v2

Best regards,
-- 
Lorenzo Bianconi <lorenzo@kernel.org>