Add brightness-levels and default-brightness-level properties to
the librem5 board description that have been used for a long time.

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index 9f374da5c18aa..f8698b6995343 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -20,6 +20,8 @@ / {
 	backlight_dsi: backlight-dsi {
 		compatible = "led-backlight";
 		leds = <&led_backlight>;
+		brightness-levels = <255>;
+		default-brightness-level = <190>;
 	};
 
 	pmic_osc: clock-pmic {
-- 
2.30.2