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SubjectRe: Any news on Runtime Interpreted Power Sequences
Hi Neil,

On 10/25/2013 09:22 AM, NeilBrown wrote:
> I'm wondering if there was any news on the Runtime Interpreted Power
> Sequences?
> The most recent news I can find is
> https://lkml.org/lkml/2013/4/27/73
> where you say they might be ready for 3.11. Clearly that didn't work
> (predictions being hard, especially about the future).
>
> I'm really keen to see them turning into a reality and I gather others are
> too. So ... can we hope?

A prerequisite of power sequences was to merge the gpiod interface, and
this is finally happening. It took much longer than I wanted, sorry
about that.

Logically speaking nothing should now stand in the way of a new version
of the power sequences. Expected maybe my own skepticism about them.

The first version of the power seqs is mainly the result of my
misunderstanding of the device tree. Reconsidering it now, if we strip
the DT support away power seqs would just become a simplified way to
describe how to power a device up and down. In other words, it would be
another way to express what can be expressed with C code and would not
bring any additional flexibility that DT-described power seqs would have
(and I say this totally convinced now that power sequences in the device
tree were a bad idea).

The advantage I could see is that using power sequences we could get rid
of the cumbersome and mistake-prone error checking code which is
basically the same for most devices. You would just need to describe
what you want to activate, and in which order, and the power seqs
framework would catch and report any error.

I'm not sure if this is a sufficient reason to introduce another
framework into the kernel, but if this is deemed a good reason by more
experienced people then I'm ok to give it a shot. If you have other
motivations for this, please also state them so I can get the whole
picture. Maybe I just need to be a little bit more motivated about this
idea myself. :)

Thanks,
Alex.



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