[PATCH v4 0/4] ARM: OMAP2+: AM33XX: VDD CORE OPP50 support

[Mark Brown]

On Tue, Sep 03, 2013 at 07:06:01AM -0700, Russ Dill wrote:
> On Thu, Aug 29, 2013 at 12:10 PM, Mark Brown <broonie at kernel.org> wrote:

> > I was thinking about the majority of regulators where setting a voltage
> > would be a single bitfield update (plus ramp delay, which is going to
> > need to be accounted for in the power on case).  If we need to do longer
> > sequences things get a bit more tricky in terms of interface but it
> > seems doable.

> The sequence for TPS65217 on beaglebone is rather long, it's 8
> register writes. It has to write the new value to the DCDC3 register
> and the apply bit to the DCDC register, but both registers are
> password locked registers. The password sequence is to write the
> password register, then the register, then the password register
> again, then the register again.

Oh dear, that's a bit annoying.  It's doable obviously if people decide
to go down that route but it's work and this is a very common system.
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