nvidia,tegra-regulators-coupling.txt

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    1 NVIDIA Tegra Regulators Coupling
    2 ================================
    3 
    4 NVIDIA Tegra SoC's have a mandatory voltage-coupling between regulators.
    5 Thus on Tegra20 there are 3 coupled regulators and on NVIDIA Tegra30
    6 there are 2.
    7 
    8 Tegra20 voltage coupling
    9 ------------------------
   10 
   11 On Tegra20 SoC's there are 3 coupled regulators: CORE, RTC and CPU.
   12 The CORE and RTC voltages shall be in a range of 170mV from each other
   13 and they both shall be higher than the CPU voltage by at least 120mV.
   14 
   15 Tegra30 voltage coupling
   16 ------------------------
   17 
   18 On Tegra30 SoC's there are 2 coupled regulators: CORE and CPU. The CORE
   19 and CPU voltages shall be in a range of 300mV from each other and CORE
   20 voltage shall be higher than the CPU by N mV, where N depends on the CPU
   21 voltage.
   22 
   23 Required properties:
   24 - nvidia,tegra-core-regulator: Boolean property that designates regulator
   25   as the "Core domain" voltage regulator.
   26 - nvidia,tegra-rtc-regulator: Boolean property that designates regulator
   27   as the "RTC domain" voltage regulator.
   28 - nvidia,tegra-cpu-regulator: Boolean property that designates regulator
   29   as the "CPU domain" voltage regulator.
   30 
   31 Example:
   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         };

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/regulator/nvidia,tegra-regulators-coupling.txt

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sys/contrib/device-tree/Bindings/regulator/nvidia,tegra-regulators-coupling.txt