| 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; |
| }; |
| }; |
| }; |
