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

[Shawn Guo]

On Thu, Sep 30, 2021 at 05:56:25PM +0200, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf at kontron.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.

I'm wondering where the existing settings were coming from?

Shawn

> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>
> ---
>  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;
>  			};
> -- 
> 2.33.0
>