regression: Clock changes in next-20141205 break at least omap4

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Tue, Dec 16, 2014 at 01:01:17PM -0700, Paul Walmsley wrote:
> So the reference clock and functional clock are (usually) required by the
> PLL to operate, and should therefore be required by the PLL clock driver
> code in the kernel; but one could claim that they aren't technically parent
> clocks of the PLL in a clock tree sense, since the downstream output clock
> isn't directly derived from either of those clocks.

The reference clock is the parent clock for a PLL, and the output clock
is a derivative of the reference clock.  The PLL maths show that very
clearly.

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