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1NVIDIA Tegra Regulators Coupling2================================3 4NVIDIA Tegra SoC's have a mandatory voltage-coupling between regulators.5Thus on Tegra20 there are 3 coupled regulators and on NVIDIA Tegra306there are 2.7 8Tegra20 voltage coupling9------------------------10 11On Tegra20 SoC's there are 3 coupled regulators: CORE, RTC and CPU.12The CORE and RTC voltages shall be in a range of 170mV from each other13and they both shall be higher than the CPU voltage by at least 120mV.14 15Tegra30 voltage coupling16------------------------17 18On Tegra30 SoC's there are 2 coupled regulators: CORE and CPU. The CORE19and CPU voltages shall be in a range of 300mV from each other and CORE20voltage shall be higher than the CPU by N mV, where N depends on the CPU21voltage.22 23Required properties:24- nvidia,tegra-core-regulator: Boolean property that designates regulator25 as the "Core domain" voltage regulator.26- nvidia,tegra-rtc-regulator: Boolean property that designates regulator27 as the "RTC domain" voltage regulator.28- nvidia,tegra-cpu-regulator: Boolean property that designates regulator29 as the "CPU domain" voltage regulator.30 31Example:32 33 pmic {34 regulators {35 core_vdd_reg: core {36 regulator-name = "vdd_core";37 regulator-min-microvolt = <950000>;38 regulator-max-microvolt = <1300000>;39 regulator-coupled-with = <&rtc_vdd_reg &cpu_vdd_reg>;40 regulator-coupled-max-spread = <170000 550000>;41 42 nvidia,tegra-core-regulator;43 };44 45 rtc_vdd_reg: rtc {46 regulator-name = "vdd_rtc";47 regulator-min-microvolt = <950000>;48 regulator-max-microvolt = <1300000>;49 regulator-coupled-with = <&core_vdd_reg &cpu_vdd_reg>;50 regulator-coupled-max-spread = <170000 550000>;51 52 nvidia,tegra-rtc-regulator;53 };54 55 cpu_vdd_reg: cpu {56 regulator-name = "vdd_cpu";57 regulator-min-microvolt = <750000>;58 regulator-max-microvolt = <1125000>;59 regulator-coupled-with = <&core_vdd_reg &rtc_vdd_reg>;60 regulator-coupled-max-spread = <550000 550000>;61 62 nvidia,tegra-cpu-regulator;63 };64 };65 };66