On Wed, Feb 19, 2020 at 11:45:40AM -0800, Tony Lindgren wrote:
> * Pavel Machek <pavel@xxxxxx> [200219 19:15]:
> > From: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
> >
> > 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@xxxxxx>
> > Signed-off-by: Jean-Jacques Hiblot <jjhiblot@xxxxxx>
> > Acked-by: Pavel Machek <pavel@xxxxxx>
> > Reviewed-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx>
> > Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
> > Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
> > Tested-by: Tony Lindgren <tony@xxxxxxxxxxx>
> > Signed-off-by: Pavel Machek <pavel@xxxxxx>
> > ---
> > 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
> >
> > Hi!
> >
> > 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.
>
> Regards,
>
> Tony
>
> 8< ------------------
> From tony Mon Sep 17 00:00:00 2001
> From: Tony Lindgren <tony@xxxxxxxxxxx>
> Date: Wed, 19 Feb 2020 11:25:27 -0800
> Subject: [PATCH] ARM: dts: droid4: Configure LED backlight for lm3532
>
> With the LED backlight changes merged, we still need the dts configured
> to have backlight working for droid4. Based on an earlier patch from
> Pavel Machek <pavel@xxxxxx>, let's configure the backlight but update
> the value range to be more usable.
>
> We have a range of 256 register values split into 8 steps, so we can
> generate the brightness levels backwards with:
>
> $ for i in 0 1 2 3 4 5 6 7; do echo "255 - ${i} * (256 / 8)" | bc; done
>
> To avoid more confusion why the LCD backlight is still not on, let's
> also enable LED backlight as a loadable module for omap2plus_defconfig.
>
> Cc: Merlijn Wajer <merlijn@xxxxxxxxxx>
> Cc: Pavel Machek <pavel@xxxxxx>
> Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> arch/arm/boot/dts/motorola-mapphone-common.dtsi | 13 +++++++++++--
> arch/arm/configs/omap2plus_defconfig | 1 +
> 2 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/boot/dts/motorola-mapphone-common.dtsi b/arch/arm/boot/dts/motorola-mapphone-common.dtsi
> --- a/arch/arm/boot/dts/motorola-mapphone-common.dtsi
> +++ b/arch/arm/boot/dts/motorola-mapphone-common.dtsi
> @@ -182,6 +182,14 @@ vibrator {
> pwm-names = "enable", "direction";
> direction-duty-cycle-ns = <10000000>;
> };
> +
> + backlight: backlight {
> + compatible = "led-backlight";
> +
> + leds = <&backlight_led>;
> + brightness-levels = <31 63 95 127 159 191 223 255>;
> + default-brightness-level = <6>;
> + };
> };
>
> &dss {
> @@ -205,6 +213,8 @@ lcd0: display {
> vddi-supply = <&lcd_regulator>;
> reset-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* gpio101 */
>
> + backlight = <&backlight>;
> +
> width-mm = <50>;
> height-mm = <89>;
>
> @@ -393,12 +403,11 @@ led-controller@38 {
> ramp-up-us = <1024>;
> ramp-down-us = <8193>;
>
> - led@0 {
> + backlight_led: led@0 {
> reg = <0>;
> led-sources = <2>;
> ti,led-mode = <0>;
> label = ":backlight";
> - linux,default-trigger = "backlight";
> };
>
> led@1 {
> diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2plus_defconfig
> --- a/arch/arm/configs/omap2plus_defconfig
> +++ b/arch/arm/configs/omap2plus_defconfig
> @@ -375,6 +375,7 @@ CONFIG_BACKLIGHT_GENERIC=m
> CONFIG_BACKLIGHT_PWM=m
> CONFIG_BACKLIGHT_PANDORA=m
> CONFIG_BACKLIGHT_GPIO=m
> +CONFIG_BACKLIGHT_LED=m
> CONFIG_FRAMEBUFFER_CONSOLE=y
> CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
> CONFIG_LOGO=y
Finally :)
Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
-- Sebastian
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