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

From: Tony Lindgren <tony@atomide•com>
To: Pavel Machek <pavel@ucw•cz>
Cc: daniel.thompson@linaro•org, mpartap@gmx•net,
	jingoohan1@gmail•com, merlijn@wizzup•org,
	martin_rysavy@centrum•cz,
	kernel list <linux-kernel@vger•kernel.org>,
	dri-devel@lists•freedesktop.org, sre@kernel•org,
	nekit1000@gmail•com, tomi.valkeinen@ti•com, jjhiblot@ti•com,
	linux-omap@vger•kernel.org, Lee Jones <lee.jones@linaro•org>,
	agx@sigxcpu•org,
	linux-arm-kernel <linux-arm-kernel@lists•infradead.org>
Subject: Re: [PATCH] backlight: add led-backlight driver
Date: Wed, 19 Feb 2020 13:15:13 -0800	[thread overview]
Message-ID: <20200219211513.GE37466@atomide.com> (raw)
In-Reply-To: <20200219205322.GA1227@duo.ucw.cz>

* Pavel Machek <pavel@ucw•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@ti•com>
> > > Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti•com>
> > > Acked-by: Pavel Machek <pavel@ucw•cz>
> > > Reviewed-by: Daniel Thompson <daniel.thompson@linaro•org>
> > > Acked-by: Lee Jones <lee.jones@linaro•org>
> > > Acked-by: Tony Lindgren <tony@atomide•com>
> > > Tested-by: Tony Lindgren <tony@atomide•com>
> > > Signed-off-by: Pavel Machek <pavel@ucw•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

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