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rc' is a virtual clock which can be set to be feed from the above (or an al=
ways on sys_clk not listed). The emu_src_clk is close to what you were comm=
enting on for etbclock.

> ATCLK - ATB interface clock
> CLK - main clock
> PCLKDBG - Debug APB clock or PCLK - APB clock
>
> I'm not sure why OMAP seems to have four clocks when the ETM has only
> three clocks itself.

The ALTCLK & PCLKDBG will be derived from one of the above clocks (emu_per,=
 emu_mpu, emu_core, emu_sys) based on routing.  Which one is used is select=
ed by CM_CLKSEL1_EMU.CLKSEL_ATCLK.  The main CLK comes from MPU DPLL tree.

A big chuck of ETM/ETB is generic coresight.  There is SOC specific emulati=
on logic which surrounds it.

Regards,
Richard W.