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* Re: LED backlight on Droid 4 and others
       [not found] ` <>
@ 2020-01-05 23:55   ` Pavel Machek
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From: Pavel Machek @ 2020-01-05 23:55 UTC (permalink / raw)
  To: Tony Lindgren, linux-leds
  Cc: kernel list, linux-arm-kernel, linux-omap, sre, nekit1000,
	mpartap, merlijn, martin_rysavy, agx, lee.jones, daniel.thompson,
	jingoohan1, dri-devel, tomi.valkeinen, jjhiblot

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> > It would be good to get LED backlight to work in clean way for 5.6
> > kernel.
> I agree, this is badly needed for many devices.
> > [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.]
> I have some version of these patches working with modified dts in my
> droid4-pending-v5.4 branch git branch, maybe try to diff against that.

So.. backlight now works for me, and I put the LED parts of the
patches to for-next

tree. [I guess I could try to sneak them into 5.5 if that helps.]

Could we somehow get this to the backlight tree?

commit d457d0c97d6d55fe3e62633791ac05d289a37d2e
Author: Tomi Valkeinen <>
Date:   Thu Oct 3 10:28:12 2019 +0200

    backlight: add led-backlight driver

    This patch adds a led-backlight driver (led_bl), which is similar
    to pwm_bl except the driver uses a LED class driver to adjust the
    brightness in the HW. Multiple LEDs can be used for a single

 Signed-off-by: Tomi Valkeinen <>
 Signed-off-by: Jean-Jacques Hiblot <>
 Acked-by: Pavel Machek <>
 Reviewed-by: Daniel Thompson <>

Best regards,
(cesky, pictures)

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