[PATCH v2 0/4] Add a generic driver for LED-based backlight

[Jean-Jacques Hiblot]

This series aims to add a led-backlight driver, similar to pwm-backlight,
but using a LED class device underneath.

A few years ago (2015), Tomi Valkeinen posted a series implementing a
backlight driver on top of a LED device:
https://patchwork.kernel.org/patch/7293991/
https://patchwork.kernel.org/patch/7294001/
https://patchwork.kernel.org/patch/7293981/

The discussion stopped because Tomi lacked the time to work on it.

The series affects the LED core and add a new backlight driver.

changes in v2:
- bkl: the backlight can use more than one LED. As a consequence don't make
  the backlight device a child of a LED controller.
- bkl: make brightness-levels and default-brightness-level optional
- bkl: removed the option to use a GPIO enable.
- bkl: removed the option to use a regulator. It should be handled by the
  LED core
- led: removed the mechanism to bind a child device for each LED
- led: improve the way of_get_led() works and add a managed version of it

Jean-Jacques Hiblot (2):
  leds: Add managed API to get a LED from a device driver
  dt-bindings: backlight: Add led-backlight binding

Tomi Valkeinen (2):
  leds: Add of_led_get() and led_put()
  backlight: add led-backlight driver

 .../bindings/leds/backlight/led-backlight.txt |  29 +++
 drivers/leds/led-class.c                      |  92 +++++++
 drivers/video/backlight/Kconfig               |   7 +
 drivers/video/backlight/Makefile              |   1 +
 drivers/video/backlight/led_bl.c              | 235 ++++++++++++++++++
 include/linux/leds.h                          |   6 +
 6 files changed, 370 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
 create mode 100644 drivers/video/backlight/led_bl.c

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2.17.1