ARM: dts: stm32: STM32MP13x SoC exposes SCMI regulators

Updates STM32MP13x SoC DTSI file to define the SoC voltage regulators
exposed by OP-TEE SCMI service and remove the fixed regulator
abstraction previously used until OP-TEE OS firmware embeds the
service which it does since its release tag 3.22.0.
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Pascal Paillet <p.paillet@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

arch/arm/boot/dts/st/stm32mp131.dtsi

@@ -52,6 +52,28 @@ scmi_reset: protocol@16 {
 				reg = <0x16>;
 				#reset-cells = <1>;
 			};
+
+			scmi_voltd: protocol@17 {
+				reg = <0x17>;
+
+				scmi_regu: regulators {
+					#address-cells = <1>;
+					#size-cells = <0>;
+
+					scmi_reg11: regulator@0 {
+						reg = <VOLTD_SCMI_REG11>;
+						regulator-name = "reg11";
+					};
+					scmi_reg18: regulator@1 {
+						reg = <VOLTD_SCMI_REG18>;
+						regulator-name = "reg18";
+					};
+					scmi_usb33: regulator@2 {
+						reg = <VOLTD_SCMI_USB33>;
+						regulator-name = "usb33";
+					};
+				};
+			};
 		};
 	};
 
@@ -78,28 +100,6 @@ timer {
 		always-on;
 	};
 
-	/* PWR 1v1, 1v8 and 3v3 regulators defined as fixed, waiting for SCMI */
-	reg11: reg11 {
-		compatible = "regulator-fixed";
-		regulator-name = "reg11";
-		regulator-min-microvolt = <1100000>;
-		regulator-max-microvolt = <1100000>;
-	};
-
-	reg18: reg18 {
-		compatible = "regulator-fixed";
-		regulator-name = "reg18";
-		regulator-min-microvolt = <1800000>;
-		regulator-max-microvolt = <1800000>;
-	};
-
-	usb33: usb33 {
-		compatible = "regulator-fixed";
-		regulator-name = "usb33";
-		regulator-min-microvolt = <3300000>;
-		regulator-max-microvolt = <3300000>;
-	};
-
 	soc {
 		compatible = "simple-bus";
 		#address-cells = <1>;
@@ -801,7 +801,7 @@ usbotg_hs: usb@49000000 {
 			g-tx-fifo-size = <256 16 16 16 16 16 16 16>;
 			dr_mode = "otg";
 			otg-rev = <0x200>;
-			usb33d-supply = <&usb33>;
+			usb33d-supply = <&scmi_usb33>;
 			status = "disabled";
 		};
 
@@ -1331,8 +1331,8 @@ usbphyc: usbphyc@5a006000 {
 			reg = <0x5a006000 0x1000>;
 			clocks = <&rcc USBPHY_K>;
 			resets = <&rcc USBPHY_R>;
-			vdda1v1-supply = <&reg11>;
-			vdda1v8-supply = <&reg18>;
+			vdda1v1-supply = <&scmi_reg11>;
+			vdda1v8-supply = <&scmi_reg18>;
 			status = "disabled";
 
 			usbphyc_port0: usb-phy@0 {