[PATCH v5 00/46] pwm: add support for atomic update

From: Boris Brezillon
Date: Wed Mar 30 2016 - 16:20:39 EST


This series adds support for atomic PWM update, or IOW, the capability
to update all the parameters of a PWM device (enabled/disabled, period,
duty and polarity) in one go.

It also adds support for initial PWM state retrieval (or hardware readout),
which should allow smooth handover between the bootloader and Linux. For
example, critical PWM users (like critical regulators controlled by a PWM)
can query the current PWM state, and adapt the PWM config without having
to disable/enable the PWM, or abruptly change the period/dutycyle/polarity

Thierry, I hope this version meets your expectations, if that's not the
case, could you let me know quickly so I can adjust the implementation
accordingly (I'd really like to get most of those changes in 4.7).

Best Regards,


Changes since v4:
- introduce pwm_args to expose per-board/platform config
- deprecate non-atomic APIs
- implement non-atomic functions as wrappers around atomic ones
- patch all PWM users to use the atomic API
- rename the ->reset_state() hook into ->get_state()
- drop most acks
- rework PWM config in the pwm-regulator driver
- patch sun4i and sti PWM drivers to support HW readout

Changes since v3:
- rebased on pwm/for-next after pulling 4.4-rc1
- replace direct access to pwm fields by pwm_get/set_xxx() helpers, thus
fixing some build errors
- split changes to allow each maintainer to review/ack or take the
modification through its subsystem

Changes since v2:
- rebased on top of 4.3-rc2
- reintroduced pwm-regulator patches

Changes since v1:
- dropped applied patches
- squashed Heiko's fixes into the rockchip driver changes
- made a few cosmetic changes
- added kerneldoc comments
- added Heiko's patch to display more information in debugfs
- dropped pwm-regulator patches (should be submitted separately)

*** BLURB HERE ***

Boris Brezillon (45):
pwm: rcar: make use of pwm_is_enabled()
backlight: pwm_bl: remove useless call to pwm_set_period()
backlight: lm3630a_bl: stop messing with the pwm->period field
pwm: get rid of pwm->lock
pwm: introduce the pwm_args concept
pwm: use pwm_get/set_xxx() helpers where appropriate
clk: pwm: use pwm_get_args() where appropriate
hwmon: pwm-fan: use pwm_get_args() where appropriate
misc: max77693-haptic: use pwm_get_args() where appropriate
leds: pwm: use pwm_get_args() where appropriate
regulator: pwm: use pwm_get_args() where appropriate
fbdev: ssd1307fb: use pwm_get_args() where appropriate
backlight: pwm_bl: use pwm_get_args() where appropriate
pwm: keep PWM state in sync with hardware state
pwm: introduce the pwm_state concept
pwm: move the enabled/disabled info into pwm_state
pwm: add the PWM initial state retrieval infra
pwm: add the core infrastructure to allow atomic update
pwm: switch to the atomic API
pwm: rockchip: add initial state retrieval
pwm: rockchip: avoid glitches on already running PWMs
pwm: rockchip: add support for atomic update
pwm: sti: add support for initial state retrieval
pwm: sti: avoid glitches on already running PWMs
pwm: sun4i: implement hardware readout
regulator: pwm: adjust PWM config at probe time
regulator: pwm: swith to the atomic PWM API
regulator: pwm: properly initialize the ->state field
regulator: pwm: retrieve correct voltage
pwm: update documentation
pwm: deprecate pwm_config(), pwm_enable() and pwm_disable()
pwm: replace pwm_disable() by pwm_apply_state()
clk: pwm: switch to the atomic API
hwmon: pwm-fan: switch to the atomic API
input: misc: max77693: switch to the atomic API
input: misc: max8997: switch to the atomic PWM API
input: misc: pwm-beeper: switch to the atomic PWM API
leds: pwm: switch to the atomic PWM API
backlight: lm3630a: switch to the atomic PWM API
backlight: lp855x: switch to the atomic PWM API
backlight: lp8788: switch to the atomic PWM API
backlight: pwm_bl: switch to the atomic PWM API
video: ssd1307fb: switch to the atomic PWM API
drm: i915: switch to the atomic PWM API
ARM: s3c24xx: rx1950: switch to the atomic PWM API

Heiko StÃbner (1):
pwm: add information about polarity, duty cycle and period to debugfs

Documentation/pwm.txt | 27 +++-
arch/arm/mach-s3c24xx/mach-rx1950.c | 17 +-
drivers/clk/clk-pwm.c | 36 ++++-
drivers/gpu/drm/i915/intel_panel.c | 39 +++--
drivers/hwmon/pwm-fan.c | 88 ++++++----
drivers/input/misc/max77693-haptic.c | 28 +++-
drivers/input/misc/max8997_haptic.c | 23 ++-
drivers/input/misc/pwm-beeper.c | 46 ++++--
drivers/leds/leds-pwm.c | 15 +-
drivers/pwm/core.c | 186 ++++++++++-----------
drivers/pwm/pwm-clps711x.c | 2 +-
drivers/pwm/pwm-crc.c | 2 +-
drivers/pwm/pwm-lpc18xx-sct.c | 9 +-
drivers/pwm/pwm-lpc32xx.c | 9 +-
drivers/pwm/pwm-omap-dmtimer.c | 2 +-
drivers/pwm/pwm-pxa.c | 2 +-
drivers/pwm/pwm-rcar.c | 2 +-
drivers/pwm/pwm-rockchip.c | 156 +++++++++++++++---
drivers/pwm/pwm-spear.c | 9 +-
drivers/pwm/pwm-sti.c | 67 +++++++-
drivers/pwm/pwm-sun4i.c | 73 ++++++---
drivers/pwm/sysfs.c | 98 ++++++++---
drivers/regulator/pwm-regulator.c | 151 ++++++++++++++---
drivers/video/backlight/lm3630a_bl.c | 15 +-
drivers/video/backlight/lp855x_bl.c | 15 +-
drivers/video/backlight/lp8788_bl.c | 17 +-
drivers/video/backlight/pwm_bl.c | 51 +++---
drivers/video/fbdev/ssd1307fb.c | 28 +++-
include/linux/pwm.h | 303 ++++++++++++++++++++++++++---------
29 files changed, 1096 insertions(+), 420 deletions(-)