[PATCH v5 00/11] pwm: imx: Provide atomic operation for IMX PWM driver

From: Lukasz Majewski
Date: Sun Jan 29 2017 - 16:55:43 EST

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.

[1]: http://patchwork.ozlabs.org/patch/685402/

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(-)