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imx8m-ddrc: Set AHB and MAIN_AXI clocks together with DRAM freq

Sebastian Krzyszkowiak requested to merge sebastian.krzyszkowiak/linux-next:ddr into pureos/byzantium

A small hack that mimics what NXP kernels do when going into low power modes. It appears to save about 60mW when idle.

I've been running it for a while on my phones with no apparent issues. Doesn't seem upstreamable at all, but maybe it's small enough to carry downstream until we get more devfreqs upstream?

Edited by Sebastian Krzyszkowiak

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