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Drivers that call regulator_get_optional are tolerant to the absence of that regulator. By modifying the value returned from the stub function to match that seen when a regulator isn't present, callers can wrap the regulator logic with an IS_ERR based conditional even if they happen to call regulator_is_supported_voltage. This improves efficiency as well as eliminates the possibility for a very subtle bug. Signed-off-by: Tim Kryger <tim.kryger@linaro.org> Reviewed-by: Alex Elder <elder@linaro.org> Signed-off-by: Mark Brown <broonie@linaro.org>