> There's one bug that your version highlights in mine - the virtual mpu
> clock in omap1 touches the DPLL and repropagates that rate. I've
> removed that repropagation, so that needs fixing.
>
> However, this raises a question: why is the virtual mpu clock touching
> some other part of the clock tree. I wonder whether this should be
> handled a different way, though the first thing that needs answering is
> why we have this alias for 'arm_ck' ?
At one point in time the virtual clock allowed control for a set of clocks with some dependencies. The mpu alias provided a convenient control point.
Tukka did original omap1 in this format. I forget its exact meaning.
The original omap2 code had behavior:
- mpu-dpll had a clock node which allowed direct mpu speed control
- mpu-virt-clock allowed switching between sets that have fixed ratio dependency which were pegged to current mpu-dll speed.
* This way round_rate would allow you to discover all valid OPPs.
The first pass OMAP3 code TI did followed omap2 but it wasn't strongly bound by ratio-sets given the multiple async-dplls. Paul has taken code in a bit different direction. He can comment on current behavior here.
Regards,
Richard W.
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