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Diffstat (limited to 'Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt b/Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt new file mode 100644 index 000000000..4bf2dbf7c --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/nvidia,tegra-regulators-coupling.txt @@ -0,0 +1,65 @@ +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; + }; + }; + }; |