[PATCH 3/4] clk: shmobile: add CPG driver for rz-platforms

[Wolfram Sang]

> While the parent is indeed selected at boot time only, and only one parent is 
> thus needed, parent selection could be performed by a DIP switch connected to 
> MD_CLK on the board for instance. In that case both parents should be 
> available in DT, as selection will be done by the kernel at boot time, not at 
> DT compile time.

OK, I understand the case. I still wonder about specifying two parents,
though. If a board uses USB_X1, it then has to spefify a dummy EXTAL
clock (or an empty one), just because USB_X1 is enumerated as second
entry?

> > Again, now that I already coded it, what is the gain to remove it? The
> > drawback is that other people might get encouraged to find reasons to
> > allow them sloppy practices.
> 
> It will make the kernel binary smaller by removing code that is not needed in 
> practice.

Sounds like a micro-optimazation to me. If you insist, we should BUG()
right away in that case, to make the code comprehensible. Returning with
a leak and saying "we will probably fail somewhere" should really be
avoided IMO.

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