Eric Anholt [off-list ref] writes:

kernel at martin.sperl.org writes:

quoted

From: Martin Sperl <redacted>

If a clock that has been enabled by the firmware gets disabled
by a driver this may right now result in a crash of the system
as then also the corresponding PLL_dividers as well as PLLs
get disabled (if not used) - some of which are used by the
VideoCore GPU (which also runs the firmware)

This patch prepares/enables those clocks that have been
configured by the firmware.

Whenever the clock framework implements either
CLK_IS_CRITICAL or HAND_OFF this can get changed to use this
new mechanism.

For this to be completely successful (i.e not missing a clock
and subsequently a pll) it is recommended to add all the known
clocks of the soc so that this can get applied to all clocks.

I think this makes sense to have, for now at least.

Reviewed-by: Eric Anholt <redacted>

Scratch that, this breaks display.  Since the clkgen clocks are flagged
as needing to be gated in order to change dividers, it means you can't
set clock rates for anything that was turned on at boot.
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