bcm2835_cpufreq_get_max_voltage
max_voltage_core = bcm2835_cpufreq_get_max_voltage(sc,
max_voltage_sdram_c = bcm2835_cpufreq_get_max_voltage(sc,
max_voltage_sdram_i = bcm2835_cpufreq_get_max_voltage(sc,
max_voltage_sdram_p = bcm2835_cpufreq_get_max_voltage(sc,