Enum system_clock_type 

#[repr(C)]
pub enum system_clock_type {
    SYSTEM_CLOCK_ROOT_CLOCK = 0,
    SYSTEM_CLOCK_FCLK = 1,
    SYSTEM_CLOCK_BCLK = 2,
    SYSTEM_CLOCK_XCLK = 3,
    SYSTEM_CLOCK_32K_CLK = 4,
    SYSTEM_CLOCK_AUPLL = 5,
}

Variants

SYSTEM_CLOCK_ROOT_CLOCK = 0

clock source before fclk_div

SYSTEM_CLOCK_FCLK = 1

clock source after fclk_div

SYSTEM_CLOCK_BCLK = 2

clock source after bclk_div

SYSTEM_CLOCK_XCLK = 3

xtal clock

SYSTEM_CLOCK_32K_CLK = 4

32K clock

SYSTEM_CLOCK_AUPLL = 5

audio PLL clock