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Add regulators coupler for Tegra30 SoCs that performs voltage balancing of a coupled regulators and thus provides voltage scaling functionality. There are 2 coupled regulators on all Tegra30 SoCs: CORE and CPU. The coupled regulator 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. Signed-off-by: Dmitry Osipenko <[email protected]> Acked-By: Peter De Schrijver <[email protected]> Signed-off-by: Thierry Reding <[email protected]>