FREQUENCY          20 drivers/gpu/drm/i915/i915_pmu.c #define FREQUENCY 200
FREQUENCY          16 drivers/staging/pi433/rf69.h #define FREQUENCY	433920000	/* Hz */
FREQUENCY          45 drivers/staging/speakup/spk_types.h 	RATE, PITCH, VOL, TONE, PUNCT, VOICE, FREQUENCY, LANG, DIRECT, PAUSE,