linux-kernel - [PATCH] arm64: dts: imx8mn-ddr4-evk: Adjust 1.2GHz OPP voltage to OD mode

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Date:   Tue, 18 Feb 2020 09:52:32 +0800
From:   Anson Huang <Anson.Huang@....com>
To:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        abel.vesa@....com, leonard.crestez@....com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH] arm64: dts: imx8mn-ddr4-evk: Adjust 1.2GHz OPP voltage to OD mode

According to latest datasheet Rev.0, 10/2019, there is restriction
as below:

"If VDD_SOC/GPU/DDR = 0.95V, then VDD_ARM must be >= 0.95V."

As by default SoC is running at OD mode(VDD_SOC = 0.95V), so
VDD_ARM 1.2GHz OPP's voltage should be increased to 0.95V.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
index 2497eeb..7a61a1a 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts
@@ -13,6 +13,12 @@
 	compatible = "fsl,imx8mn-ddr4-evk", "fsl,imx8mn";
 };
 
+&a53_opp_table {
+	opp-1200000000 {
+		opp-microvolt = <950000>;
+	};
+};
+
 &A53_0 {
 	cpu-supply = <&buck2_reg>;
 };
-- 
2.7.4