From: Lorenzo Pieralisi <[email protected]>
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
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