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While there's no actual implementation behind it having the call to use in drivers makes them feel neater from a driver author point of view. An actual implementation can wait for someone who needs to use the function in a real system. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> [mturquette@linaro.org: void return type instead of int -EINVAL] Signed-off-by: Mike Turquette <mturquette@linaro.org>