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* [PATCH v8 0/5] Add a generic driver for LED-based backlight
@ 2019-10-03  8:28 Jean-Jacques Hiblot
  2019-10-03  8:28 ` [PATCH v8 1/5] leds: populate the device's of_node when possible Jean-Jacques Hiblot
                   ` (5 more replies)
  0 siblings, 6 replies; 29+ messages in thread
From: Jean-Jacques Hiblot @ 2019-10-03  8:28 UTC (permalink / raw)
  To: jacek.anaszewski, pavel, robh+dt, mark.rutland, lee.jones,
	daniel.thompson
  Cc: dmurphy, linux-leds, linux-kernel, dri-devel, tomi.valkeinen,
	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.

changes in v8:
- use class_find_device_by_of_node() instead of class_find_device()
- renamed devm_led_get() as devm_of_led_get()

changes in v7:
- rebased on top of linux-leds/for-next
- populate the of_node member of the LED device if fwnode is a of_node
  (this is a new patch and the first of the series).
- devm_led_get() works only when the device tree is used. Add a few checks
  for that.  

changes in v6:
- trim the list of included headers
- remove useless definition of BKL_FULL_BRIGHTNESS

changes in v5:
- removed LED brightness scaling
- disable sysfs the interface of the LEDs when used by the backlight device

changes in v4:
- fix dev_err() messages and commit logs following the advices of Pavel
- cosmetic changes (indents, getting rid of  "? 1 : 0" in
  led_match_led_node())

changes in v3:
- dt binding: don't limit the brightness range to 0-255. Use the range of
  the underlying LEDs. as a side-effect, all LEDs must now have the same
  range
- driver: Adapt to dt binding update.
- driver: rework probe() for clarity and remove the remaining goto.

changes in v2:
- handle more than one LED.
- don't make the backlight device a child of the LED controller.
- make brightness-levels and default-brightness-level optional
- removed the option to use a GPIO enable.
- removed the option to use a regulator. It should be handled by the LED
  core
- don't make any change to the LED core (not needed anymore)

Jean-Jacques Hiblot (3):
  leds: populate the device's of_node when possible
  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 |  28 ++
 drivers/leds/led-class.c                      |  98 ++++++-
 drivers/video/backlight/Kconfig               |   7 +
 drivers/video/backlight/Makefile              |   1 +
 drivers/video/backlight/led_bl.c              | 260 ++++++++++++++++++
 include/linux/leds.h                          |   6 +
 6 files changed, 399 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
 create mode 100644 drivers/video/backlight/led_bl.c

-- 
2.17.1


^ permalink raw reply	[flat|nested] 29+ messages in thread

end of thread, other threads:[~2019-10-08 19:55 UTC | newest]

Thread overview: 29+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-03  8:28 [PATCH v8 0/5] Add a generic driver for LED-based backlight Jean-Jacques Hiblot
2019-10-03  8:28 ` [PATCH v8 1/5] leds: populate the device's of_node when possible Jean-Jacques Hiblot
2019-10-04 21:08   ` Jacek Anaszewski
2019-10-03  8:28 ` [PATCH v8 2/5] leds: Add of_led_get() and led_put() Jean-Jacques Hiblot
2019-10-03 10:42   ` Sebastian Reichel
2019-10-03 12:47     ` Jean-Jacques Hiblot
2019-10-03 17:43       ` Jacek Anaszewski
2019-10-03 18:35         ` Mark Brown
2019-10-03 19:21           ` Jacek Anaszewski
2019-10-03 19:41             ` Mark Brown
2019-10-03 20:27               ` Should regulator core support parsing OF based fwnode? (was: Re: [PATCH v8 2/5] leds: Add of_led_get() and led_put()) Jacek Anaszewski
2019-10-04 10:12                 ` Should regulator core support parsing OF based fwnode? Jean-Jacques Hiblot
2019-10-04 11:39                 ` Should regulator core support parsing OF based fwnode? (was: Re: [PATCH v8 2/5] leds: Add of_led_get() and led_put()) Mark Brown
2019-10-04 13:33                   ` Should regulator core support parsing OF based fwnode? Jean-Jacques Hiblot
2019-10-04 14:40                     ` Mark Brown
2019-10-04 15:13                       ` Jean-Jacques Hiblot
2019-10-04 15:58                         ` Mark Brown
2019-10-04 16:12                           ` Jean-Jacques Hiblot
2019-10-04 17:42                             ` Mark Brown
2019-10-04 20:55                               ` Jacek Anaszewski
2019-10-03  8:28 ` [PATCH v8 3/5] leds: Add managed API to get a LED from a device driver Jean-Jacques Hiblot
2019-10-03 10:47   ` Sebastian Reichel
2019-10-03  8:28 ` [PATCH v8 4/5] dt-bindings: backlight: Add led-backlight binding Jean-Jacques Hiblot
2019-10-03 11:17   ` Sebastian Reichel
2019-10-03  8:28 ` [PATCH v8 5/5] backlight: add led-backlight driver Jean-Jacques Hiblot
2019-10-03 11:47   ` Sebastian Reichel
2019-10-03 17:23     ` Jean-Jacques Hiblot
2019-10-03 11:40 ` [PATCH v8 0/5] Add a generic driver for LED-based backlight Lee Jones
2019-10-08 19:55   ` Pavel Machek

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