Hi, On 19/12/15 22:41, Adam Ford wrote: > Tomi, > > Do you have any thought on how to approach adding sleep/delay > functions? I have a display that requires a small delay before and > after the enable gpio toggle. I assume that some may require a delay > after the regulator starts for it to be be ready. For now I have a > temp hack that just inserts a blanket 300mS wait, but I'd rather have > something mainstreamed in the device tree, but I don't want to walk > over someone else's work either.
I don't think it makes sense to add explicit entries for these, as we'd just end up with lots of entries in the DT files for "wait-before-vcc", "wait-after-vcc", etc. There was a patch series some time ago, trying to add generic power up/down sequences defined in DT. I don't think that ever got merged, as there wasn't a consensus on the DT side. I can't find the series right now, as I don't remember the author or the subject... I think that kind of generic sequence framework would make sense, and getting it merged without the DT side should be easier. Then the drivers could have built-in sequences for certain panels. Tomi
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