cpufreq: allow driver-specific data
This commit extends the cpufreq_driver structure with an additional 'void *driver_data' field that can be filled by the ->probe() function of a cpufreq driver to pass additional custom information to the driver itself. A new function called cpufreq_get_driver_data() is added to allow a cpufreq driver to retrieve those driver data, since they are typically needed from a cpufreq_policy->init() callback, which does not have access to the cpufreq_driver structure. This function call is similar to the existing cpufreq_get_current_driver() function call. Signed-off-by: NThomas Petazzoni <thomas.petazzoni@free-electrons.com> Acked-by: NViresh Kumar <viresh.kumar@linaro.org> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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