AT91_PMC_CFDEV     20 include/dt-bindings/clock/at91.h #define AT91_PMC_CFDEV		18		/* Clock Failure Detector Event */
AT91_PMC_CFDEV    166 include/linux/clk/at91_pmc.h #define		AT91_PMC_CFDEV		(1 << 18)		/* Clock Failure Detector Event [some SAM9] */