This series makes it possible for the LED core to manage the power supply of a LED. It uses the regulator API to disable/enable the power if when the LED is turned on/off. This is especially useful in situations where the LED driver/controller is not supplying the power. Because updating a regulator state can block, it is always a defered job. Note: this series relies on led_cdev->dev->of_node being populated [0] [0] https://lkml.org/lkml/2019/10/3/139 changes in v7: - Add sysfs interface to control the auto-off feature changes in v6: - Introduce a new property in DT binding to delay turning OFF the regulator The idea is to keep the regulator ON for some time after the LED is turned off in order to not change the regulator state when the LED is blinking. - Use an atomic to track the state of the regulator to ensure consistency. - Remove changes in led_set_brightness_sync(). changes in v5: - fixed build error in led_set_brightness_sync(). Explain the role of flush__work() changes in v4: - Add a new patch to make led_set_brightness_sync() use led_set_brightness_nosleep() and then wait the work to be done - Rework how the core knows how the regulator needs to be updated. changes in v3: - reword device-tree description - reword commit log - remove regulator updates from functions used in atomic context. If the regulator must be updated, it is defered to a workqueue. - Fix led_set_brightness_sync() to work with the non-blocking function __led_set_brightness() changes in v2: - use devm_regulator_get_optional() to avoid using the dummy regulator and do some unnecessary work Jean-Jacques Hiblot (2): dt-bindings: leds: document the "power-supply" property leds: Add control of the voltage/current regulator to the LED core .../devicetree/bindings/leds/common.txt | 14 ++ drivers/leds/led-class.c | 156 +++++++++++++++++- drivers/leds/led-core.c | 129 ++++++++++++++- drivers/leds/leds.h | 18 ++ include/linux/leds.h | 9 + 5 files changed, 318 insertions(+), 8 deletions(-) -- 2.17.1
