On Thu, Mar 12, 2009 at 12:35:24PM -0800, David Brownell wrote: > On Thursday 12 March 2009, Mark Brown wrote: > > safely share a regulator without extra work since they have no way of > > telling why a regulator is in the state that it's in without extra > > stuff. > Depends what you mean by "safely". If they weren't buggy > already, I don't see how they'd notice any difference. > Having buggy consumers become non-buggy isn't exactly a > job for the framework itself. Previously the per-consumer reference count would've meant that they couldn't interfere with other consumers - they could set their own state but not reverse an enable something else had done. Now there is only one reference count but there's no way for a consumer to exclude other consumers and nothing which protects against breakage. > > We should probably have something along the lines of a > > regulator_get_exclusive() for them. Previously the consumer counting > > would have stopped them interfering with enables done by other > > consumers. > I'd like to see get()/put() match the design pattern used > elsewhere in the kernel: those calls signify refcount > operations. Aquiring a reference is obviously what we want in the rather common case where the supply is shared. We could name an operation that enforces non shared supplies something else but at the end of the day it's going to be the same operation. The major purpose of adding an explicit call for this is to document the requirement the consumer has for direct control of what it's doing. > Agreed that the "consumer" access model probably needs a few > interface updates. I'm not sure what they would be though; > one notion would be to focus on the constraints they apply > (including "enabled") instead of what they do now. I'm not at all sure what you mean by this - constraint narrowing by the consumers is pretty much exactly the model the existing code has. We need to do things like re-add the voltage handling that was removed pre merge but that's already the programming model we have. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
