[PATCH] clk: rockchip: Set "ignore unused" for PMU M0 clocks on rk3399

Heiko Stübner heiko at sntech.de
Wed Feb 15 09:01:25 PST 2017

Am Mittwoch, 15. Februar 2017, 12:27:59 CET schrieb Javier Martinez Canillas:
> Hello Doug,
> On Tue, Feb 14, 2017 at 6:01 PM, Douglas Anderson <dianders at chromium.org> 
> > The PMU Cortex M0 on rk3399 is intended to be used for things like
> > DDRFreq transitions, suspend/resume, and other things that are the
> > purview of ARM Trusted Firmware and not the kernel.  As such, the
> > kernel shouldn't be messing with the clocks.  Add CLK_IGNORE_UNUSED to
> > these clocks.
> Isn't CLK_IS_CRITICAL a more suitable flag for this case?

>From the patch description it looks like the clock is expected to be 
controlled from firmware in most cases as I guess the Cortex M0 will be used 
for that all the time now. And the clock is not expected to run all the time.

So I'd think clk_ignore_unused is the correct one. The whole clock-subtree for 
these clocks also does not get affected by other clocks, as it is 
independendly coming from PLLs.


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