UCLK

[Andy Green]

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Somebody in the thread at some point said:
| In a message from Ben Dooks on linux-arm-kernel about cpufreq, he said:
|
|  > > - My patches have code to use hardware flow control to "pause" the
|  > > serial ports during frequency transitions, so as to not confuse the
|  > > GTA01 GSM modem (or Openmoko's gsmd).
|  >
|  > That is useful for designs that forgot to provide a stable UCLK to
|  > provide UART baud clocks... all of the ones that I've had a direct
|  > hand in working on feed back or feed in an external known (and stable)
|  > clock.
|
| It might be worth considering this on future designs (looking at the
| schematics, GTA01 uses the pin for something else, while GTA02 doesn't
| connect the pin at all).

It's a good point, it would help the UART continuity during clock
change.  But it means adding an oscillator somewhere?  There's a PLL
from the Wolfson we could maybe use.

- -Andy
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