Hello,
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 config.
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,
Boris
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 Stübner (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(-)