• Hans-Christian Egtvedt's avatar
    [AVR32] CPU frequency scaling for AT32AP · 9e58e185
    Hans-Christian Egtvedt authored
    This patch enables CPU frequency scaling for AT32AP devices. This will
    enable the CPU to scale between the speed of the high speed bus and
    the master clock and thus save some power.
    
    The patch also adds a parent to cpu_clk and a cpu_clk_set_rate to
    enable changing the CPU clock divider in a sane way.
    
    The driver does not check if the given rate is 0, thus resulting in a
    div by 0.  I think this check should be go into the clk_set_rate
    framework, and not here.
    
    Tested on AT32AP7000/ATSTK1000.
    
    Hardware documentation can be found in the AT32AP7000 datasheet.
    Signed-off-by: default avatarHans-Christian Egtvedt <hcegtvedt@atmel.com>
    Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
    9e58e185
cpufreq.c 2.71 KB