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