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Add support for getting the 'vref-supply' regulator and register it as ADC's reference voltage regulator, so clients can translate sampled ADC values to the voltage. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>