Syscon nodes needs at least 2 compatibles to be compliant why yaml 
documentation.

Signed-off-by: Benjamin Gaignard <benjamin.gaign...@st.com>
---
 arch/arm/boot/dts/stm32mp151.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/stm32mp151.dtsi 
b/arch/arm/boot/dts/stm32mp151.dtsi
index 36f38a95b4de..0b86a916e297 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1127,7 +1127,7 @@
                };
 
                pwr_mcu: pwr_mcu@50001014 {
-                       compatible = "syscon";
+                       compatible = "st,stm32mp151-pwr-mcu", "syscon";
                        reg = <0x50001014 0x4>;
                };
 
-- 
2.15.0

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