Re: [PATCH 4/4] leds: lm3532: Introduce the lm3532 LED driver

From: Tony Lindgren
Date: Mon Mar 25 2019 - 10:54:50 EST

* Dan Murphy <dmurphy@xxxxxx> [190325 12:36]:
> On 3/22/19 5:16 PM, Tony Lindgren wrote:
> > I can control the backlight brightness just fine via /sys, and
> > backlight shows up as the trigger in /sys/class/leds/lm3532:backlight,
> > but /sys/class/backlight is empty and looks like drm can't find it.
> >
> > Do I need to enable some additional driver(s) to get this to work
> > with the drm driver?
> >
> Can you dump or point to the defconfig?

This is just with the omap2plus_defconfig as in the droid4-pending-v5.0
test branch below [0]. That branch has Sebastian's drm patches. The
branch also has the older ti-lmu patches that I reverted for testing
before applying your new series and enabling it in .config.

The drm driver (drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c) just

backlight = of_parse_phandle(node, "backlight", 0);

That should still work the same, right?