linux-kernel - Re: [PATCH] backlight: add led-backlight driver

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Message-ID: <20200219205322.GA1227@duo.ucw.cz>
Date:   Wed, 19 Feb 2020 21:53:23 +0100
From:   Pavel Machek <pavel@....cz>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        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: [PATCH] backlight: add led-backlight driver

Hi!

> > 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 backlight.
> > 
> > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
> > Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
> > Acked-by: Pavel Machek <pavel@....cz>
> > Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
> > Acked-by: Lee Jones <lee.jones@...aro.org>
> > Acked-by: Tony Lindgren <tony@...mide.com>
> > Tested-by: Tony Lindgren <tony@...mide.com>
> > Signed-off-by: Pavel Machek <pavel@....cz>
> > ---
> >  drivers/video/backlight/Kconfig  |   7 ++
> >  drivers/video/backlight/Makefile |   1 +
> >  drivers/video/backlight/led_bl.c | 260 +++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 268 insertions(+)
> >  create mode 100644 drivers/video/backlight/led_bl.c

> > Here's the version of the driver I have. AFAICT
> > default-brightness-level handling is ok, so does not need to be
> > changed.
> > 
> > Lee, it would be easiest for me if you could apply it to your tree and
> > push, but given enough time I can push it to Linus, too.
> 
> Oh you're using quoted-printable for patches.. Got it applied now,
> and it still works. Below is also the related dts change that
> I tested with.
> 
> Feel free to pick the dts change too, naturally that should
> not be applied before the driver.
> 
> If you guys instead want me to pick these both into my fixes
> branch, just let me know and I'll do the explaining why these
> are needed as fixes. Basically we no longer have a way to enable
> the LCD backlight for droid4 manually starting with v5.6-rc1
> unlike earlier.

If you are willing to do that, it looks like good solution from my
point of view.

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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