On Tue, Sep 03, 2013 at 07:06:01AM -0700, Russ Dill wrote: > On Thu, Aug 29, 2013 at 12:10 PM, Mark Brown <[email protected]> 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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