linux-kernel - [PATCH v2 2/6] arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct

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Date:   Fri, 15 Oct 2021 14:48:36 +0200
From:   Frieder Schrempf <frieder@...s.de>
To:     devicetree@...r.kernel.org,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     stable@...r.kernel.org, Fabio Estevam <festevam@...il.com>,
        Heiko Thiery <heiko.thiery@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: [PATCH v2 2/6] arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct

From: Frieder Schrempf <frieder.schrempf@...tron.de>

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@...r.kernel.org
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
Changes in v2:
  * Fix the commit ref in the Fixes tag
  * Improve commit message
---
 arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

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 6eacc32bc95e..4df45b5e5f6e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
@@ -92,10 +92,12 @@ regulators {
 			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 {
@@ -112,7 +114,7 @@ reg_vdd_arm: BUCK2 {
 			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;
 			};
-- 
2.33.0