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SubjectRe: [PATCH v4 0/4] Add a generic driver for LED-based backlight
On Thu, 18 Jul 2019, Jacek Anaszewski wrote:

> On 7/17/19 4:15 PM, Jean-Jacques Hiblot wrote:
> > 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 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 (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 | 28 ++
> > drivers/leds/led-class.c | 92 ++++++
> > drivers/video/backlight/Kconfig | 7 +
> > drivers/video/backlight/Makefile | 1 +
> > drivers/video/backlight/led_bl.c | 268 ++++++++++++++++++
> > include/linux/leds.h | 6 +
> > 6 files changed, 402 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> > create mode 100644 drivers/video/backlight/led_bl.c
> >
>
> For the whole set:
>
> Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
>
> Lee - we need to create immutable branch for this set since there will
> be some interfering changes in the LED core in this cycle.
>
> I can create the branch and send the pull request once we will
> obtain the ack from Rob for DT bindings, unless you have other
> preference.

We also require a review to be conducted by Daniel Thompson.

After which, an immutable branch sounds like a good idea. I'd like to
create this myself if you don't mind.

--
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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