linux-kernel - [PATCH v6 0/2] pwm: add support for NXPs high-side switch MC33XS2410

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Message-Id: <20240927125745.38367-1-dima.fedrau@gmail.com>
Date: Fri, 27 Sep 2024 14:57:43 +0200
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: 
Cc: Dimitri Fedrau <dima.fedrau@...il.com>,
	Uwe Kleine-König <ukleinek@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-pwm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v6 0/2] pwm: add support for NXPs high-side switch MC33XS2410

The MC33XS2410 is a four channel high-side switch. Featuring advanced
monitoring and control function, the device is operational from 3.0 V to
60 V. The device is controlled by SPI port for configuration.

Changes in V2:
  - fix title in devicetree binding
  - fix commit message in devicetree binding patch
  - remove external clock from pwms and create clocks property
  - switch to unevaluatedProperties: false
  - add missing properties for complete example:
    - pwm-names
    - pwms
    - interrupts
    - clocks

Changes in V3:
  - Add description of the general behaviour of the device (limitations)
  - Drop unused defines
  - Add ranges comments for defines with parameters
  - Drop MC33XS2410_PERIOD_MAX, MC33XS2410_PERIOD_MIN defines
  - Drop mc33xs2410_period variable
  - Round down when calculating period and duty cycle
  - Use switch instead of loop when calculating frequency
  - Removed ret variable in mc33xs2410_pwm_get_freq
  - Handle all accesses in a single call to spi_sync_transfer
  - Fix comments in function mc33xs2410_pwm_get_period
  - Fix call pwm_set_relative_duty_cycle(state, ret, 255), instead
    pwm_set_relative_duty_cycle(state, val[1] + 1, 256);
  - Use devm_pwmchip_alloc
  - Fix typo s/Transitition/Transition/
  - Drop driver_data
  - Removed patch for direct inputs from series
  - Tested with PWM_DEBUG enabled, didn't before !

Changes in V4:
  - removed include of math.h, already included in math64.h
  - removed include of mutex.h, no mutexes are used
  - added include of bitfield.h(FIELD_GET, FIELD_PREP), fixes errors
    discovered by kernel test robot
  - cast parameters in DIV_ROUND_UP to u32, fixes errors discovered by
    kernel test robot

Changes in V5:
  - Fix comment in mc33xs2410_pwm_get_freq, selecting steps instead of
    period
  - Add comment in mc33xs2410_pwm_get_relative_duty_cycle that duty_cycle
    cannot overflow and and period is not zero, guaranteed by the caller
  - Hardware emits a low level when disabled, disable if duty_cycle = 0 is
    requested.
  - Fix complaints when PWM_DEBUG enabled, round-down division in
    mc33xs2410_pwm_apply and round-up in mc33xs2410_pwm_get_state.
  - Add comment for disabling watchdog in probe

Changes in V6:
  - Add link to manual
  - Redefine MC33XS2410_GLB_CTRL_MODE_MASK as MC33XS2410_GLB_CTRL_MODE and
    MC33XS2410_GLB_CTRL_NORMAL_MODE as MC33XS2410_GLB_CTRL_MODE_NORMAL
  - Remove define MC33XS2410_MIN_PERIOD_STEP(x) as there is no need for
    parameters and use instead MC33XS2410_MIN_PERIOD
  - Rename function to_pwm_mc33xs2410_chip to mc33xs2410_from_chip
  - Add comment in mc33xs2410_pwm_get_freq why count should be rounded up
  - Fix incorrect comment in mc33xs2410_pwm_get_period
  - Rename steps variable to doubled_steps in function
    mc33xs2410_pwm_get_freq
  - remove cast in mc33xs2410_pwm_set_relative_duty_cycle
  - remove duty_cycle from if in mc33xs2410_pwm_set_relative_duty_cycle

Dimitri Fedrau (2):
  dt-bindings: pwm: add support for MC33XS2410
  pwm: add support for NXPs high-side switch MC33XS2410

 .../bindings/pwm/nxp,mc33xs2410.yaml          | 118 +++++
 drivers/pwm/Kconfig                           |  12 +
 drivers/pwm/Makefile                          |   1 +
 drivers/pwm/pwm-mc33xs2410.c                  | 422 ++++++++++++++++++
 4 files changed, 553 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pwm/nxp,mc33xs2410.yaml
 create mode 100644 drivers/pwm/pwm-mc33xs2410.c

-- 
2.39.5