[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?
> 
> That's a good question. Mike, would it be possible to support "holes" in the 
> DT clocks lists, like the GPIO DT bindings do ?

I talked to Magnus and we decided to start with hardcoded EXTAL for now,
and leave USB_X1 support for in incremental patch when this is actually
needed. Note that the devkit will most likely be the only board ever
with a selectable root clock.

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