BCM53XX_REF_CLK
clk->clk_ref = BCM53XX_REF_CLK;
sc->sc_frequency = BCM53XX_REF_CLK;
#define TIMER_FREQ BCM53XX_REF_CLK
#define CCA_UART_FREQ BCM53XX_REF_CLK
BCM53XX_REF_CLK, COM_TYPE_NORMAL, comcnmode))