On Fri, 2016-04-22 at 08:28 +1000, Benjamin Herrenschmidt wrote:

It may or may not be already correct, you don't necessarily have a
serial enabled bootloader or it might be using a UART driver that
doesn't use the 'standard' divisors etc... This just sanitizes it.

This register contains misc controls. That specific bit controls a
clock divisor by 13 from the main 24Mhz source, which provides a
reasonably "standard" 1.84 Mhz input to the UARTs.

On a second thought ... if we chose to not support random crap vendor
uboots, we could make it a requirement that this register is already
set appropriately by the bootloader to match what's in the device-tree
I suppose...

That, along with a watchdog driver, would allow us to completely remove
that init code.

Joel, Jeremy, your call.

Cheers,
Ben.