• Viresh Kumar's avatar
    cpufreq: Implement light weight ->target_index() routine · 9c0ebcf7
    Viresh Kumar authored
    Currently, the prototype of cpufreq_drivers target routines is:
    
    int target(struct cpufreq_policy *policy, unsigned int target_freq,
    		unsigned int relation);
    
    And most of the drivers call cpufreq_frequency_table_target() to get a valid
    index of their frequency table which is closest to the target_freq. And they
    don't use target_freq and relation after that.
    
    So, it makes sense to just do this work in cpufreq core before calling
    cpufreq_frequency_table_target() and simply pass index instead. But this can be
    done only with drivers which expose their frequency table with cpufreq core. For
    others we need to stick with the old prototype of target() until those drivers
    are converted to expose frequency tables.
    
    This patch implements the new light weight prototype for target_index() routine.
    It looks like this:
    
    int target_index(struct cpufreq_policy *policy, unsigned int index);
    
    CPUFreq core will call cpufreq_frequency_table_target() before calling this
    routine and pass index to it. Because CPUFreq core now requires to call routines
    present in freq_table.c CONFIG_CPU_FREQ_TABLE must be enabled all the time.
    
    This also marks target() interface as deprecated. So, that new drivers avoid
    using it. And Documentation is updated accordingly.
    
    It also converts existing .target() to newly defined light weight
    .target_index() routine for many driver.
    Acked-by: default avatarHans-Christian Egtvedt <egtvedt@samfundet.no>
    Acked-by: default avatarJesper Nilsson <jesper.nilsson@axis.com>
    Acked-by: Linus Walleij's avatarLinus Walleij <linus.walleij@linaro.org>
    Acked-by: default avatarRussell King <linux@arm.linux.org.uk>
    Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
    Tested-by: default avatarAndrew Lunn <andrew@lunn.ch>
    Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
    Signed-off-by: default avatarRafael J. Wysocki <rjw@rjwysocki.net>
    9c0ebcf7
sa1110-cpufreq.c 9.06 KB