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. In this version, I dropped all patches converting PWM users and PWM drivers to the atomic API in order to limit the number of patches and ease review. I plan to send the remaining patches once these ones have been accepted. If you want to test the series, or see the big picture, you can have a look at this branch [1]. Best Regards, Boris [1]https://github.com/bbrezillon/linux-rk/tree/atomic-pwm Changes since v5: - fix bugs in pwm_apply_state() implementation - drop already applied patches - s/pstate/state/ - add pwm_apply_args() helper - limit the series to core changes and required changes in PWM users code 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) Boris Brezillon (23): 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 input: misc: max77693: 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 backlight: lp8788: explicitly apply PWM config extracted from pwm_args backlight: lp855x: explicitly apply PWM config extracted from pwm_args backlight: lm3630a: explicitly apply PWM config extracted from pwm_args input: misc: max8997: explicitly apply PWM config extracted from pwm_args input: misc: pwm-beeper: explicitly apply PWM config extracted from pwm_args drm: i915: explicitly apply PWM config extracted from pwm_args ARM: explicitly apply PWM config extracted from pwm_args 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: update documentation pwm: switch to the atomic API Heiko Stübner (1): pwm: add information about polarity, duty cycle and period to debugfs Documentation/pwm.txt | 30 +++- arch/arm/mach-s3c24xx/mach-rx1950.c | 6 + drivers/clk/clk-pwm.c | 17 +- drivers/gpu/drm/i915/intel_panel.c | 6 + drivers/hwmon/pwm-fan.c | 26 ++- drivers/input/misc/max77693-haptic.c | 17 +- drivers/input/misc/max8997_haptic.c | 6 + drivers/input/misc/pwm-beeper.c | 6 + drivers/leds/leds-pwm.c | 11 +- drivers/pwm/core.c | 214 ++++++++++++++-------- drivers/pwm/pwm-clps711x.c | 2 +- drivers/pwm/pwm-crc.c | 2 +- drivers/pwm/pwm-lpc18xx-sct.c | 2 +- drivers/pwm/pwm-omap-dmtimer.c | 2 +- drivers/pwm/pwm-pxa.c | 2 +- drivers/pwm/pwm-sun4i.c | 3 +- drivers/pwm/sysfs.c | 61 ++++--- drivers/regulator/pwm-regulator.c | 20 ++- drivers/video/backlight/lm3630a_bl.c | 6 + drivers/video/backlight/lp855x_bl.c | 6 + drivers/video/backlight/lp8788_bl.c | 6 + drivers/video/backlight/pwm_bl.c | 10 +- drivers/video/fbdev/ssd1307fb.c | 11 +- include/linux/pwm.h | 335 +++++++++++++++++++++++++++-------- 24 files changed, 606 insertions(+), 201 deletions(-) -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
