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From: Anson Huang <Anson.Huang@nxp.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org,
	s.hauer@pengutronix.de, kernel@pengutronix.de,
	festevam@gmail.com, leonard.crestez@nxp.com,
	daniel.baluta@nxp.com, horia.geanta@nxp.com, peng.fan@nxp.com,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: Linux-imx@nxp.com
Subject: [PATCH V2] arm64: dts: imx8mn: Adjust 1.2GHz OPP voltage to OD mode
Date: Mon, 24 Feb 2020 10:07:40 +0800	[thread overview]
Message-ID: <1582510060-12272-1-git-send-email-Anson.Huang@nxp.com> (raw)

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@nxp.com>
---
Changes since V1:
	- Move the OPP change from board dts for soc dtsi.
---
 arch/arm64/boot/dts/freescale/imx8mn.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
index c98a376..f277572 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
@@ -116,7 +116,7 @@
 
 		opp-1200000000 {
 			opp-hz = /bits/ 64 <1200000000>;
-			opp-microvolt = <850000>;
+			opp-microvolt = <950000>;
 			opp-supported-hw = <0xb00>, <0x7>;
 			clock-latency-ns = <150000>;
 			opp-suspend;
-- 
2.7.4


WARNING: multiple messages have this Message-ID (diff)
From: Anson Huang <Anson.Huang@nxp.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, shawnguo@kernel.org,
	s.hauer@pengutronix.de, kernel@pengutronix.de,
	festevam@gmail.com, leonard.crestez@nxp.com,
	daniel.baluta@nxp.com, horia.geanta@nxp.com, peng.fan@nxp.com,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: Linux-imx@nxp.com
Subject: [PATCH V2] arm64: dts: imx8mn: Adjust 1.2GHz OPP voltage to OD mode
Date: Mon, 24 Feb 2020 10:07:40 +0800	[thread overview]
Message-ID: <1582510060-12272-1-git-send-email-Anson.Huang@nxp.com> (raw)

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@nxp.com>
---
Changes since V1:
	- Move the OPP change from board dts for soc dtsi.
---
 arch/arm64/boot/dts/freescale/imx8mn.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
index c98a376..f277572 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
@@ -116,7 +116,7 @@
 
 		opp-1200000000 {
 			opp-hz = /bits/ 64 <1200000000>;
-			opp-microvolt = <850000>;
+			opp-microvolt = <950000>;
 			opp-supported-hw = <0xb00>, <0x7>;
 			clock-latency-ns = <150000>;
 			opp-suspend;
-- 
2.7.4


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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2020-02-24  2:13 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24  2:07 Anson Huang [this message]
2020-02-24  2:07 ` [PATCH V2] arm64: dts: imx8mn: Adjust 1.2GHz OPP voltage to OD mode Anson Huang
2020-02-24  7:51 ` Shawn Guo
2020-02-24  7:51   ` Shawn Guo

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