On Mon, Jun 20, 2016 at 11:16:07AM -0500, Rob Herring wrote: > On Mon, Jun 20, 2016 at 07:26:51PM +0800, Peter Chen wrote: > > If the node has property "power-sequence", the pwrseq core will create > > related platform device, and the driver under pwrseq driver will handle > > power sequence stuffs. > This I have issue with. If you are creating a platform device here, you > are trying to work-around limitations in the linux driver model. Either > we need some sort of pre-probe hook to the drivers to call or each > parent node driver is responsible for checking and calling pwr-seq > functions for child nodes. e.g. The host controller calls pwr-seq for > the hub, the hub driver calls the power seq for the asix chip. Soon as > we have a case too complex for the generic pwr-seq, we're going to need > the pre-probe hook as I don't want to see a continual expansion of > generic pwr-seq binding for ever more complex cases. I think it's fairly clear that we need one or both of these mechanisms for enumerable buses in embedded contexts - it's something that keeps croping up.
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