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If the referenced regulator is a dummy, the voltage is invalid, but someone doesn't need the voltage, just need the adc value, so don't return fail at probe when the regulator is dummy. If he wants the voltage, configures the actual referenced regulator at dts. Change-Id: I8eaecc1a8e7e57c3a87aa69b9b852735bf4a025a Signed-off-by: David Wu <david.wu@rock-chips.com>