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Date:   Sun, 29 Jan 2017 22:54:04 +0100
From:   Lukasz Majewski <>
To:     Thierry Reding <>,
        Sascha Hauer <>,
        Stefan Agner <>,
        Boris Brezillon <>,,
        Bhuvanchandra DV <>,
Cc:     Lothar Wassmann <>,,
        Fabio Estevam <>,
        Lukasz Majewski <>
Subject: [PATCH v5 00/11] pwm: imx: Provide atomic operation for IMX PWM driver

This patch set brings atomic operation to i.MX's PWMv2 driver.

This work has been supported and suggested by Boris Brezillon [1] and 
Stefan Agner, by showing how simple the transition could be :-) (in theory).

It has been divided into several steps:

- Remove ipg clock and enable per clock when required (as proposed by Boris 

- Provide different pwm ops for PWMv1 and PWMv2

- Separate PWMv1 commits from "generic" and non atomic PWM code

  NOTE: Since I do _not_ have board with PWMv1, I would like to ask somebody
        for testing

- Move some imx_config_v2 code to separate functions

- Provide PWM atomic implementation (the ->apply() driver) for PWMv2 in a
  single patch for better readability. This patch also includes some code
  to address potential issues on i.MX7 (lack of peripheral clock when accessing
  PWM registers).

- Remove redundant PWM code (disable, enable, config callbacks)

- Update proper documentation entries

- Provide support for polarity inversion on top of atomic PWM rework

Test HW:
This patch set has been tested on i.MX6q board with
v4.10-rc5 kernel SHA1: 1b1bc42c1692e9b62756323c675a44cb1a1f9dbd

The PWM operation has been tested with pwm_bl backlight driver by changing
its brightness.


Lothar Wassmann (2):
  pwm: print error messages with pr_err() instead of pr_debug()
  pwm: core: make the PWM_POLARITY flag in DTB optional

Lukasz Majewski (8):
  pwm: imx: Add separate set of pwm ops for PWMv1 and PWMv2
  pwm: imx: Rewrite imx_pwm_*_v1 code to facilitate switch to atomic pwm
  pwm: imx: Move PWMv2 software reset code to a separate function
  pwm: imx: Move PWMv2 wait for fifo slot code to a separate function
  pwm: imx: Provide atomic PWM support for i.MX PWMv2
  pwm: imx: Remove redundant i.MX PWMv2 code
  pwm: imx: doc: Update imx-pwm.txt documentation entry
  pwm: imx: Add polarity inversion support to i.MX's PWMv2

Sascha Hauer (1):
  pwm: imx: remove ipg clock and enable per clock when required

 Documentation/devicetree/bindings/pwm/imx-pwm.txt |   6 +-
 drivers/pwm/core.c                                |  26 ++-
 drivers/pwm/pwm-imx.c                             | 269 ++++++++++------------
 3 files changed, 145 insertions(+), 156 deletions(-)


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