On Tue, Oct 05, 2021 at 03:10:14PM +0200, Frieder Schrempf wrote:
> On 05.10.21 08:53, Shawn Guo wrote:
> > On Thu, Sep 30, 2021 at 05:56:25PM +0200, Frieder Schrempf wrote:
> >> From: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
> >>
> >> 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?
>
> Good question, but I can't really retrace now how I actually determined
> the values back then. Seems like I had failed to validate them properly.
Please update commit log with these background info.
Shawn
>
> >
> >>
> >> Signed-off-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
> >> ---
> >> 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
> >>
