From: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> Subject: [PATCH RFC v2 2/2] Documentation: arm: define DT C-states bindings Date: Mon, 20 Jan 2014 17:47:59 +0000 > + - latency > + Usage: Required > + Value type: <prop-encoded-array> > + Definition: List of u32 values representing worst case latency > + in microseconds required to enter and exit the > + C-state, one value per OPP [2]. The list should > + be specified in the same order as the operating > + points property list of the cpu this state is > + valid on. > + If no OPP bindings are present, the latency value > + is associated with the current OPP of CPUs in the > + system. I'm afraid the CPU OPP is not enough to capture the variance in latencies. Especially memory frequency affects some of the latencies very stronly. --Antti -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
