[RFC] ARM: Enable dynamic clock gating?

Sören Brinkmann soren.brinkmann at xilinx.com
Thu Jul 31 07:24:17 PDT 2014

Hi all,

similar to the patch enabling the SCU standby mode
(https://lkml.org/lkml/2014/7/30/122), I have a patch to enable the A9's
'dynamic clock gating'
in platform code. This might also be a candidate to enable in common
Do you think that would make sense?
I tried to find the right place to add this and was looking at
mm/proc-v7.S. It probably works to put it there, but does not really
seem to be the right place.

As reference, this is what I currently have as part of platform code:
  /* A9 clock gating */
  asm volatile ("mrc  p15, 0, r12, c15, c0, 0\n"
                "orr  r12, r12, #1\n"
                "mcr  p15, 0, r12, c15, c0, 0\n"
                : /* no outputs */
                : /* no inputs */
                : "r12");


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