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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