ARM: dts: stm32: Add boot-led for stm32mp1 ST boards

Add options/u-boot/boot-led property to specify to U-Boot
the LED which indicates a successful boot.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://lore.kernel.org/r/20251112-upstream_add_boot-led_for_stm32_boards-v1-10-50a3a9b339a8@foss.st.com
Link: https://lore.kernel.org/r/20251112-upstream_add_boot-led_for_stm32_boards-v1-11-50a3a9b339a8@foss.st.com
Link: https://lore.kernel.org/r/20251112-upstream_add_boot-led_for_stm32_boards-v1-12-50a3a9b339a8@foss.st.com
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

Author: Patrice Chotard

arch/arm/boot/dts/st/stm32mp135f-dk.dts

@@ -73,7 +73,7 @@
 	leds {
 		compatible = "gpio-leds";
 
-		led-blue {
+		led_blue: led-blue {
 			function = LED_FUNCTION_HEARTBEAT;
 			color = <LED_COLOR_ID_BLUE>;
 			gpios = <&gpioa 14 GPIO_ACTIVE_LOW>;
@@ -88,6 +88,13 @@
 		};
 	};
 
+	options {
+		u-boot {
+			compatible = "u-boot,config";
+			boot-led = <&led_blue>;
+		};
+	};
+
 	panel_backlight: panel-backlight {
 		compatible = "gpio-backlight";
 		gpios = <&gpioe 12 GPIO_ACTIVE_HIGH>;

arch/arm/boot/dts/st/stm32mp157c-ed1.dts

@@ -74,7 +74,7 @@
 
 	led {
 		compatible = "gpio-leds";
-		led-blue {
+		led_blue: led-blue {
 			gpios = <&gpiod 9 GPIO_ACTIVE_HIGH>;
 			linux,default-trigger = "heartbeat";
 			default-state = "off";
@@ -89,6 +89,13 @@
 		};
 	};
 
+	options {
+		u-boot {
+			compatible = "u-boot,config";
+			boot-led = <&led_blue>;
+		};
+	};
+
 	sd_switch: regulator-sd_switch {
 		compatible = "regulator-gpio";
 		regulator-name = "sd_switch";

arch/arm/boot/dts/st/stm32mp15xx-dkx.dtsi

@@ -64,7 +64,7 @@
 
 	led {
 		compatible = "gpio-leds";
-		led-blue {
+		led_blue: led-blue {
 			function = LED_FUNCTION_HEARTBEAT;
 			color = <LED_COLOR_ID_BLUE>;
 			gpios = <&gpiod 11 GPIO_ACTIVE_HIGH>;
@@ -79,6 +79,13 @@
 		};
 	};
 
+	options {
+		u-boot {
+			compatible = "u-boot,config";
+			boot-led = <&led_blue>;
+		};
+	};
+
 	sound {
 		compatible = "audio-graph-card";
 		label = "STM32MP15-DK";