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- NVIDIA Tegra Regulators Coupling
- ================================
- NVIDIA Tegra SoC's have a mandatory voltage-coupling between regulators.
- Thus on Tegra20 there are 3 coupled regulators and on NVIDIA Tegra30
- there are 2.
- Tegra20 voltage coupling
- ------------------------
- On Tegra20 SoC's there are 3 coupled regulators: CORE, RTC and CPU.
- The CORE and RTC voltages shall be in a range of 170mV from each other
- and they both shall be higher than the CPU voltage by at least 120mV.
- Tegra30 voltage coupling
- ------------------------
- On Tegra30 SoC's there are 2 coupled regulators: CORE and CPU. The CORE
- and CPU voltages shall be in a range of 300mV from each other and CORE
- voltage shall be higher than the CPU by N mV, where N depends on the CPU
- voltage.
- Required properties:
- - nvidia,tegra-core-regulator: Boolean property that designates regulator
- as the "Core domain" voltage regulator.
- - nvidia,tegra-rtc-regulator: Boolean property that designates regulator
- as the "RTC domain" voltage regulator.
- - nvidia,tegra-cpu-regulator: Boolean property that designates regulator
- as the "CPU domain" voltage regulator.
- Example:
- pmic {
- regulators {
- core_vdd_reg: core {
- regulator-name = "vdd_core";
- regulator-min-microvolt = <950000>;
- regulator-max-microvolt = <1300000>;
- regulator-coupled-with = <&rtc_vdd_reg &cpu_vdd_reg>;
- regulator-coupled-max-spread = <170000 550000>;
- nvidia,tegra-core-regulator;
- };
- rtc_vdd_reg: rtc {
- regulator-name = "vdd_rtc";
- regulator-min-microvolt = <950000>;
- regulator-max-microvolt = <1300000>;
- regulator-coupled-with = <&core_vdd_reg &cpu_vdd_reg>;
- regulator-coupled-max-spread = <170000 550000>;
- nvidia,tegra-rtc-regulator;
- };
- cpu_vdd_reg: cpu {
- regulator-name = "vdd_cpu";
- regulator-min-microvolt = <750000>;
- regulator-max-microvolt = <1125000>;
- regulator-coupled-with = <&core_vdd_reg &rtc_vdd_reg>;
- regulator-coupled-max-spread = <550000 550000>;
- nvidia,tegra-cpu-regulator;
- };
- };
- };
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