linux-kernel - [PATCH v5 0/3] leds: Add control of the voltage/current regulator to the LED core

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Date:   Mon, 23 Sep 2019 12:20:56 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...com>
To:     <jacek.anaszewski@...il.com>, <pavel@....cz>,
        <daniel.thompson@...aro.org>
CC:     <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <dmurphy@...com>, <tomi.valkeinen@...com>,
        Jean-Jacques Hiblot <jjhiblot@...com>
Subject: [PATCH v5 0/3] leds: Add control of the voltage/current regulator to the LED core

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 defered to
set_brightness_delayed().

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 (3):
  led: make led_set_brightness_sync() use led_set_brightness_nosleep()
  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       |  6 ++
 drivers/leds/led-class.c                      | 17 ++++
 drivers/leds/led-core.c                       | 78 +++++++++++++++++--
 drivers/leds/leds.h                           |  3 +
 include/linux/leds.h                          |  5 ++
 5 files changed, 101 insertions(+), 8 deletions(-)

-- 
2.17.1