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The DAC is used to find the peak level of an alternating voltage input signal by a binary search using the output of a comparator wired to an interrupt pin. Like so: _ | \ input +------>-------|+ \ | \ .-------. | }---. | | | / | | dac|-->--|- / | | | |_/ | | | | | | | | irq|------<-------' | | '-------' Signed-off-by: Peter Rosin <peda@axentia.se> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>