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Date:   Mon, 6 Jan 2020 00:55:51 +0100
From:   Pavel Machek <>
To:     Tony Lindgren <>,
Cc:     kernel list <>,
        linux-arm-kernel <>,,,,,,,,,,,,,
Subject: Re: LED backlight on Droid 4 and others


> > 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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