From: Tony Lindgren Date: Wed, 19 Feb 2020 19:25:27 +0000 (-0800) Subject: ARM: dts: droid4: Configure LED backlight for lm3532 X-Git-Tag: v5.10.7~2062^2~6^2~35 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=10dc62d0ae4167770e9ab150fc1ab55baa82e010;p=platform%2Fkernel%2Flinux-rpi.git 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 , 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 Cc: Pavel Machek Reviewed-by: Sebastian Reichel Acked-by: Pavel Machek Signed-off-by: Tony Lindgren --- diff --git a/arch/arm/boot/dts/motorola-mapphone-common.dtsi b/arch/arm/boot/dts/motorola-mapphone-common.dtsi index 8566550..b6e82b1 100644 --- a/arch/arm/boot/dts/motorola-mapphone-common.dtsi +++ b/arch/arm/boot/dts/motorola-mapphone-common.dtsi @@ -182,6 +182,14 @@ 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 @@ vddi-supply = <&lcd_regulator>; reset-gpios = <&gpio4 5 GPIO_ACTIVE_HIGH>; /* gpio101 */ + backlight = <&backlight>; + width-mm = <50>; height-mm = <89>; @@ -393,12 +403,11 @@ 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 index c32c338..847f987 100644 --- 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