[PATCH v3 0/5] pwm: omap-dmtimer: Allow for dynamic pwm period updates

Lokesh Vutla
2020-03-12T04:23:13Z

This series fixes minor issues in config callback and allows for on the
fly updates for pwm period and duty cycle. This is mainly intended to
allow pwm omap dmtimer to be used for generating a 1PPS signal that can be
syncronized to PTP clock in CPTS module available in AM335x and AM57xx SoCs.

Series depends on the following series:
- https://patchwork.kernel.org/patch/11379875/
- https://patchwork.kernel.org/project/linux-omap/list/?series=251691

Full dependencies can be seen here:
https://github.com/lokeshvutla/linux/tree/devel/pwm-dynamic-period-updates-v3

Changes since v2:
- Restored the existing behavior on pwm stop. PWM stops immediately when
.stop is called as timer counter stops immediately. If just the
autoreload is disabled as in v2, there is a possibility that pwm is
never stopped.
- Added the above limitation in the driver description
- Rebased on top of v5.6-rc5

Changes since v1:
- Updated commit description in PATCH 1
- Added a brief about PWM generation using OMAP DM timer.
- Updated the pwm stop callback to allow for completing the current pwm
cycle.
- Added the limitaitons of hardware.
- Used hw status instead of relying on pwm framework for state update.

Lokesh Vutla (5):
pwm: omap-dmtimer: Drop unused header file
pwm: omap-dmtimer: Update description for pwm omap dm timer
pwm: omap-dmtimer: Fix pwm enabling sequence
pwm: omap-dmtimer: Do not disable pwm before changing
period/duty_cycle
pwm: omap-dmtimer: Implement .apply callback

drivers/pwm/pwm-omap-dmtimer.c | 219 ++++++++++++------
include/clocksource/timer-ti-dm.h | 3 +-
.../linux/platform_data/pwm_omap_dmtimer.h | 90 -------
3 files changed, 149 insertions(+), 163 deletions(-)
delete mode 100644 include/linux/platform_data/pwm_omap_dmtimer.h

--
2.23.0