Quoting Tony Lindgren (2015-01-30 17:04:44)

Hi all,

Looks like commit cb75a8fcd14e ("clk: Add rate constraints to clocks")
causes a regression on at least omaps where the serial console either
does not show anything, or just prints garbage.

Reverting cb75a8fcd14e makes things work again on next-20150130.

Any ideas?

Stephen posted a patch[0] to fix this. I've squashed that into Tomeu's
commit that you reference above and my Panda board is booting fine once
again.

[0] http://lkml.kernel.org/r/[ref]

Please let me know if any other issues pop up. There are new WARNs for
OMAP3+ boards introduced by a different patch from Tomeu, but this is
really because the OMAP DPLL and FAPLL code are dereferencing struct clk
pointers when they should not be and is a separate issue from the
constraints patch (with a separate email thread).

Regards,
Mike

Regards,

Tony