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

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Date:   Mon, 25 Mar 2019 07:54:44 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Dan Murphy <dmurphy@...com>
Cc:     robh+dt@...nel.org, jacek.anaszewski@...il.com, pavel@....cz,
        lee.jones@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH 4/4] leds: lm3532: Introduce the lm3532 LED driver

* Dan Murphy <dmurphy@...com> [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
does:

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

That should still work the same, right?

Regards,

Tony


[0] https://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap.git/log/?h=droid4-pending-v5.0