From: Frieder Schrempf <frieder@fris.de>
To: devicetree@vger.kernel.org,
Frieder Schrempf <frieder.schrempf@kontron.de>,
Krzysztof Kozlowski <krzk@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>
Cc: stable@vger.kernel.org, Fabio Estevam <festevam@gmail.com>,
Heiko Thiery <heiko.thiery@gmail.com>,
NXP Linux Team <linux-imx@nxp.com>,
Pengutronix Kernel Team <kernel@pengutronix.de>
Subject: [PATCH v2 2/6] arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct
Date: Fri, 15 Oct 2021 14:48:36 +0200 [thread overview]
Message-ID: <20211015124841.28226-3-frieder@fris.de> (raw)
In-Reply-To: <20211015124841.28226-1-frieder@fris.de>
From: Frieder Schrempf <frieder.schrempf@kontron.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@vger.kernel.org
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.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
next prev parent reply other threads:[~2021-10-15 12:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-15 12:48 [PATCH v2 0/6] Devicetree fixes and additions for Kontron SL/BL i.MX8MM boards Frieder Schrempf
2021-10-15 12:48 ` [PATCH v2 1/6] arm64: dts: imx8mm-kontron: Add support for ultra high speed modes on SD card Frieder Schrempf
2021-10-15 12:48 ` Frieder Schrempf [this message]
2021-10-15 12:48 ` [PATCH v2 3/6] arm64: dts: imx8mm-kontron: Set lower limit of VDD_SNVS to 800 mV Frieder Schrempf
2021-10-15 12:48 ` [PATCH v2 4/6] arm64: dts: imx8mm-kontron: Fix polarity of reg_rst_eth2 Frieder Schrempf
2021-10-15 12:48 ` [PATCH v2 5/6] arm64: dts: imx8mm-kontron: Fix CAN SPI clock frequency Frieder Schrempf
2021-10-15 12:48 ` [PATCH v2 6/6] arm64: dts: imx8mm-kontron: Fix connection type for VSC8531 RGMII PHY Frieder Schrempf
2021-10-16 7:50 ` [PATCH v2 0/6] Devicetree fixes and additions for Kontron SL/BL i.MX8MM boards Shawn Guo
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