Remove u-boot,error-led property as it's the legacy LED stuff.
Use /options/u-boot to configure LED device as described here [1].

[1] 
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/options/u-boot.yaml

Signed-off-by: Patrice Chotard <[email protected]>
---

 arch/arm/dts/stm32mp135f-dk-u-boot.dtsi | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/arm/dts/stm32mp135f-dk-u-boot.dtsi 
b/arch/arm/dts/stm32mp135f-dk-u-boot.dtsi
index f004e9840a2..a9c575319c5 100644
--- a/arch/arm/dts/stm32mp135f-dk-u-boot.dtsi
+++ b/arch/arm/dts/stm32mp135f-dk-u-boot.dtsi
@@ -11,11 +11,16 @@
        };
 
        config {
-               u-boot,boot-led = "led-blue";
-               u-boot,error-led = "led-red";
                u-boot,mmc-env-partition = "u-boot-env";
        };
 
+       options {
+               u-boot {
+                       compatible = "u-boot,config";
+                       boot-led = <&led_blue>;
+               };
+       };
+
        gpio-keys {
                button-user-1 {
                        label = "User-1";
@@ -30,7 +35,7 @@
        };
 
        leds {
-               led-blue {
+               led_blue: led-blue {
                        /delete-property/default-state;
                };
 
-- 
2.43.0

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