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
Brezillon)
- 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
operation
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(-)
--
2.1.4
