linux-kernel - Re: LED backlight on Droid 4 and others

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Date:   Tue, 11 Feb 2020 09:29:00 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Pavel Machek <pavel@....cz>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, sre@...nel.org, nekit1000@...il.com,
        mpartap@....net, merlijn@...zup.org, martin_rysavy@...trum.cz,
        agx@...xcpu.org, daniel.thompson@...aro.org, jingoohan1@...il.com,
        dri-devel@...ts.freedesktop.org, tomi.valkeinen@...com,
        jjhiblot@...com
Subject: Re: LED backlight on Droid 4 and others

* Lee Jones <lee.jones@...aro.org> [200106 08:46]:
> On Sun, 05 Jan 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?

I don't care if we use "default-brightness", or if we use
"default-brightness-level". The binding merged says now
"default-brightness", so let's go with that one. That's what
other LED drivers are using too.

Regards,

Tony