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If a platform specific OPP driver has called this routine first and set the regulators, then the second call from cpufreq-dt driver will hit the WARN_ON(). Remove the WARN_ON(), but continue to return error in such cases. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Tested-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>