arm64: dts: imx8mn-evk: fix the min/max voltages of the PMIC

Use the proper voltages as supported by the board instead of the ones
supported by the PMIC. The voltages were taken from both the schematic
of the 8MNANOLPD4-EVK eval board and the datasheet of the IMX8MN SoC.
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Heiko Thiery <heiko.thiery@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn-evk.dts

@@ -42,8 +42,8 @@ pmic: pmic@25 {
 		regulators {
 			buck1: BUCK1{
 				regulator-name = "VDD_SOC";
-				regulator-min-microvolt = <600000>;
-				regulator-max-microvolt = <2187500>;
+				regulator-min-microvolt = <850000>;
+				regulator-max-microvolt = <950000>;
 				regulator-boot-on;
 				regulator-always-on;
 				regulator-ramp-delay = <3125>;
@@ -51,8 +51,8 @@ buck1: BUCK1{
 
 			buck2: BUCK2 {
 				regulator-name = "VDD_ARM_0V9";
-				regulator-min-microvolt = <600000>;
-				regulator-max-microvolt = <2187500>;
+				regulator-min-microvolt = <850000>;
+				regulator-max-microvolt = <1000000>;
 				regulator-boot-on;
 				regulator-always-on;
 				regulator-ramp-delay = <3125>;
@@ -62,32 +62,32 @@ buck2: BUCK2 {
 
 			buck4: BUCK4{
 				regulator-name = "VDD_3V3";
-				regulator-min-microvolt = <600000>;
-				regulator-max-microvolt = <3400000>;
+				regulator-min-microvolt = <3300000>;
+				regulator-max-microvolt = <3300000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
 			buck5: BUCK5{
 				regulator-name = "VDD_1V8";
-				regulator-min-microvolt = <600000>;
-				regulator-max-microvolt = <3400000>;
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
 			buck6: BUCK6 {
 				regulator-name = "NVCC_DRAM_1V1";
-				regulator-min-microvolt = <600000>;
-				regulator-max-microvolt = <3400000>;
+				regulator-min-microvolt = <1100000>;
+				regulator-max-microvolt = <1100000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
 			ldo1: LDO1 {
 				regulator-name = "NVCC_SNVS_1V8";
-				regulator-min-microvolt = <1600000>;
-				regulator-max-microvolt = <3300000>;
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
@@ -95,23 +95,23 @@ ldo1: LDO1 {
 			ldo2: LDO2 {
 				regulator-name = "VDD_SNVS_0V8";
 				regulator-min-microvolt = <800000>;
-				regulator-max-microvolt = <1150000>;
+				regulator-max-microvolt = <800000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
 			ldo3: LDO3 {
 				regulator-name = "VDDA_1V8";
-				regulator-min-microvolt = <800000>;
-				regulator-max-microvolt = <3300000>;
+				regulator-min-microvolt = <1800000>;
+				regulator-max-microvolt = <1800000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
 			ldo4: LDO4 {
 				regulator-name = "VDD_PHY_1V2";
-				regulator-min-microvolt = <800000>;
-				regulator-max-microvolt = <3300000>;
+				regulator-min-microvolt = <1200000>;
+				regulator-max-microvolt = <1200000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};