diff --git a/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a.dtso b/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a.dtso
index f89641bdb23b..7be955be58ed 100644
--- a/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a.dtso
+++ b/arch/arm64/boot/dts/st/stm32mp257d-engicam-microgea-rmm-overlay-rk050hr345-ct106a.dtso
@@ -10,6 +10,7 @@
 /dts-v1/;
 /plugin/;
 
+#include <dt-bindings/clock/st,stm32mp25-rcc.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 
@@ -35,6 +36,8 @@ touchscreen@38 {
 };
 
 &ltdc {
+	/* RGB output: the pixel clock is the LTDC kernel clock */
+	clocks = <&rcc CK_KER_LTDC>, <&rcc CK_BUS_LTDC>, <&syscfg>, <&lvds>;
 	pinctrl-names = "default", "sleep";
 	pinctrl-0 = <&ltdc_pins_a>;
 	pinctrl-1 = <&ltdc_sleep_pins_a>;