LED backlight on Droid 4 and others

[Tony Lindgren]

* Lee Jones <lee.jones at linaro.org> [200218 13:52]:
> On Wed, 12 Feb 2020, Pavel Machek wrote:
> 
> > Hi!
> > 
> > > > > It would be good to get LED backlight to work in clean way for 5.6
> > > > > kernel.
> > > ...
> > > > > [If you have an idea what else is needed, it would be welcome; it
> > > > > works for me in development tree but not in tree I'd like to
> > > > > upstream.]
> > > > > 
> > > > > Lee, would you be willing to take "backlight: add led-backlight
> > > > > driver"? Would it help if I got "leds: Add managed API to get a LED
> > > > > from a device driver" and "leds: Add of_led_get() and led_put()" into
> > > > > for_next tree of the LED subsystem?
> > > > 
> > > > It looks like you have an open question from Tony on v10.
> > > > 
> > > > Is that patch orthogonal, or are there depend{ants,encies}?
> > > 
> > > Uhh looks like we messed up a bit with integration. Now droid4
> > > LCD backlight can no longer be enabled at all manually in v5.6-rc1
> > > without the "add led-backlight driver" patch.. Should we just
> > > merge it to fix it rather than start scrambling with other
> > > temporary hacks?
> > 
> > We should just merge the "add led-backlight driver". Everything should
> > be ready for it. I'm sorry if I broke something working, I was not
> > aware it worked at all.
> > 
> > Unfortunately, this is backlight code, not LED, so I can't just merge it.
> 
> Please go ahead.  Apply my Acked-by and merge away ASAP.
> 
> Acked-by: Lee Jones <lee.jones at linaro.org>

OK best to merge the driver via the LED tree:

Acked-by: Tony Lindgren <tony at atomide.com>
Tested-by: Tony Lindgren <tony at atomide.com>