diff --git a/fdts/stm32mp157c-ed1.dts b/fdts/stm32mp157c-ed1.dts
index 11e0a61..5c9818f 100644
--- a/fdts/stm32mp157c-ed1.dts
+++ b/fdts/stm32mp157c-ed1.dts
@@ -135,14 +135,15 @@
 
 			vtt_ddr: ldo3 {
 				regulator-name = "vtt_ddr";
-				regulator-min-microvolt = <500000>;
-				regulator-max-microvolt = <750000>;
 				regulator-always-on;
 				regulator-over-current-protection;
+				st,regulator-sink-source;
 			};
 
 			vdd_usb: ldo4 {
 				regulator-name = "vdd_usb";
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
 			};
 
 			vdd_sd: ldo5 {
diff --git a/fdts/stm32mp15xx-dkx.dtsi b/fdts/stm32mp15xx-dkx.dtsi
index 9cc5368..975d749 100644
--- a/fdts/stm32mp15xx-dkx.dtsi
+++ b/fdts/stm32mp15xx-dkx.dtsi
@@ -131,10 +131,9 @@
 
 			vtt_ddr: ldo3 {
 				regulator-name = "vtt_ddr";
-				regulator-min-microvolt = <500000>;
-				regulator-max-microvolt = <750000>;
 				regulator-always-on;
 				regulator-over-current-protection;
+				st,regulator-sink-source;
 			};
 
 			vdd_usb: ldo4 {
@@ -160,7 +159,6 @@
 			vref_ddr: vref_ddr {
 				regulator-name = "vref_ddr";
 				regulator-always-on;
-				regulator-over-current-protection;
 			};
 
 			bst_out: boost {