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    SubjectRe: [PATCH V5 07/12] arm64: dts: imx8mn-evk: update vdd_soc dvs voltage
    On 22-11-16, Peng Fan wrote:
    > > Subject: Re: [PATCH V5 07/12] arm64: dts: imx8mn-evk: update vdd_soc dvs
    > > voltage
    > >
    > > Hi Peng,
    > >
    > > On 22-11-15, Peng Fan (OSS) wrote:
    > > > From: Peng Fan <peng.fan@nxp.com>
    > > >
    > > > Per schematic, BUCK1 is for VDD_SOC&DRAM&PU_0V9. The
    > > > nxp,dvs-run-voltage and nxp,dvs-standby-voltage need set for BUCK1, not
    > > BUCK2.
    > > > BUCK2 is for A53, which is handled by DVFS, so no need dvs property.
    > > >
    > > > Signed-off-by: Peng Fan <peng.fan@nxp.com>
    > > > ---
    > > > arch/arm64/boot/dts/freescale/imx8mn-evk.dts | 4 ++--
    > > > 1 file changed, 2 insertions(+), 2 deletions(-)
    > > >
    > > > diff --git a/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
    > > > b/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
    > > > index 4eb467df5ba7..a5a7d74ec1d5 100644
    > > > --- a/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
    > > > +++ b/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
    > > > @@ -47,6 +47,8 @@ buck1: BUCK1{
    > > > regulator-boot-on;
    > > > regulator-always-on;
    > > > regulator-ramp-delay = <3125>;
    > > > + nxp,dvs-run-voltage = <950000>;
    > >
    > > One last question on this. According the schematic the max should be
    > > 0.88/0.945V and you are going to set it to 0.950V.
    >
    > No, my schematic shows the TYP voltage is 0.85/0.95V.

    I have the Rev.A2 i.MX8MNano DDR4 SoM schematic and TYP is listed as
    0.8/0.9V. Is this different for different ram configurations? Sorry for
    asking but the i.MX8MNano LPDDR4 schematic is not available.

    > > According the driver the nxp,dvs-run-voltage is just the same as the normal
    > > regulator voltage. So I would suggest to just use the nxp,dvs-standby-
    > > voltage property to enable the DVS feature since the run voltage is already
    > > handled by the regulator-min-microvolt/regulator-max-microvolt. So it
    > > would be just:
    > It should be fine to not set nxp,dvs-run-voltage, because bootloader already
    > set that.

    Okay, so leave the voltage as it is right now and just add the
    nxp,dvs-standby-voltage seems fine :)

    Regards,
    Marco

    >
    > Thanks,
    > Peng.
    > >
    > > > + nxp,dvs-standby-voltage = <750000>;
    > >
    > > Regards,
    > > Marco
    > >
    > > > };
    > > >
    > > > buck2: BUCK2 {
    > > > @@ -56,8 +58,6 @@ buck2: BUCK2 {
    > > > regulator-boot-on;
    > > > regulator-always-on;
    > > > regulator-ramp-delay = <3125>;
    > > > - nxp,dvs-run-voltage = <950000>;
    > > > - nxp,dvs-standby-voltage = <850000>;
    > > > };
    > > >
    > > > buck4: BUCK4{
    > > > --
    > > > 2.37.1
    > > >
    > > >
    > > >
    >

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