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SubjectRe: [PATCH] arm64: dts: imx8mn-ddr4-evk: Adjust 1.2GHz OPP voltage to OD mode
On Tue, Feb 18, 2020 at 09:52:32AM +0800, Anson Huang wrote:
> 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>
> ---
> 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>;
> + };
> +};
> +

The restriction applies to SoC rather than a particular board, right?
If so, the change should be made in imx8mn.dtsi?

Shawn

> &A53_0 {
> cpu-supply = <&buck2_reg>;
> };
> --
> 2.7.4
>

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