linux-kernel - Re: [PATCH 2/8] arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct

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Date:   Thu, 30 Sep 2021 18:02:01 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     Frieder Schrempf <frieder@...s.de>, devicetree@...r.kernel.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:     Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH 2/8] arm64: dts: imx8mm-kontron: Make sure SOC and DRAM
 supply voltages are correct

On 30.09.21 17:56, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> 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 1.5 GHz.
> 
> This information is taken from the datasheet and the uboot-imx code.
> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>

This should also have:

Fixes: 21c4f45b335f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and
baseboards")
Cc: stable@...r.kernel.org

> ---
>  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 03b3516abd64..b12fb7ce6686 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 {
> @@ -111,7 +113,7 @@ 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;
>  			};
>