arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct

It looks like the voltages for the SOC and DRAM supply weren't properly
validated before. The datasheet and uboot-imx code tells us that VDD_SOC
should be 800 mV in suspend and 850 mV in run mode. VDD_DRAM should be
950 mV for DDR clock frequencies of up to 1.5 GHz.

Let's fix these values to make sure the voltages are within the required
range.

Fixes: 8668d8b2e67f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards")
Cc: stable@vger.kernel.org
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
index 9db9b90bf2bc9a46d9fd77fe8465f7ca4c5bf4a4..7cf60c17c29b4e2d7a5a0814449bfb15db237def 100644 (file)
--- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
@@ -91,10 +91,12 @@
                        reg_vdd_soc: BUCK1 {
                                regulator-name = "buck1";
                                regulator-min-microvolt = <800000>;
-                               regulator-max-microvolt = <900000>;
+                               regulator-max-microvolt = <850000>;
                                regulator-boot-on;
                                regulator-always-on;
                                regulator-ramp-delay = <3125>;
+                               nxp,dvs-run-voltage = <850000>;
+                               nxp,dvs-standby-voltage = <800000>;
                        };
 
                        reg_vdd_arm: BUCK2 {
@@ -111,7 +113,7 @@
                        reg_vdd_dram: BUCK3 {
                                regulator-name = "buck3";
                                regulator-min-microvolt = <850000>;
-                               regulator-max-microvolt = <900000>;
+                               regulator-max-microvolt = <950000>;
                                regulator-boot-on;
                                regulator-always-on;
                        };