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32dd0e5491
New driver memory_state_time tracks time spent in different DDR frequency and bandwidth states. Memory drivers such as qcom,cpubw can post updated state to the driver after registering a callback. Processed by a workqueue Bandwidth buckets are read in from device tree in the relevant qualcomm section, can be defined in any quantity and spacing. The data is exposed at /sys/kernel/memory_state_time, able to be read by the Android framework. Functionality is behind a config option CONFIG_MEMORY_STATE_TIME Change-Id: I4fee165571cb975fb9eacbc9aada5e6d7dd748f0 Signed-off-by: James Carr <carrja@google.com>