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

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Date:   Wed, 19 Feb 2020 13:15:13 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Pavel Machek <pavel@....cz>
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

* Pavel Machek <pavel@....cz> [200219 20:54]:
> 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.

OK. I'll apply them but won't push out yet in case Lee is already
applying the driver change..

Pavel, care to ack the dts patch?

Regards,

Tony