Messages in this thread | | | Subject | Re: [RFC PATCH v2 09/17] ARM: dts: tegra20: harmony: Setup voltage regulators for DVFS | From | Stephen Warren <> | Date | Mon, 22 Oct 2018 09:33:23 -0600 |
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On 10/21/18 2:54 PM, Dmitry Osipenko wrote: > Set min/max regulators voltage and add CPU node that hooks up CPU with > voltage regulators.
> diff --git a/arch/arm/boot/dts/tegra20-harmony.dts b/arch/arm/boot/dts/tegra20-harmony.dts
> - sm0 { > + core_vdd_reg: sm0 { > regulator-name = "vdd_sm0,vdd_core"; > - regulator-min-microvolt = <1200000>; > - regulator-max-microvolt = <1200000>; > + regulator-min-microvolt = <1000000>; > + regulator-max-microvolt = <1300000>; > + regulator-coupled-with = <&rtc_vdd_reg>; > + regulator-coupled-max-spread = <150000>; > regulator-always-on; > };
How do you know for sure that these increased ranges are safe (high end) and stable (low end) for this particular board? IIRC the safe/legal range depends on the chip SKU, and to be honest I have no idea which SKU is present on Harmony... For public boards like Colibri I imagine there's enough information out there to tell what will work, but maybe not our internal boards like Harmony, unless you checked our ancient downstream kernels?
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