On Tue, Oct 05, 2010 at 08:35:08PM +0100, Alan Cox wrote: > > If the board doesn't use regulators you can just disable the regulator > > API at which point it compiles out into stubs which report success - > > this has been the case from day one. There's only an issue if the board > > has a regulator configuration which is partially visible to software. > Which is quite likely on anything complex and means that hardcoding > regulator assumptions is bad. When I say "partially visible" I mean where we can't say what's there - we can cope fine with stuff that isn't software controllable. The issue is that we can't automatically discover the system configuration. > I actually see two ways of attacking that, one is that the dummy > regulator *and* the compiled in regulator system have a standard > regulator value that can be passed which means "report success, move > along nothing to see" that could be passed into drivers, the other is to > not stick the stuff in drivers. > I suspect the former may be cleaner ? I'm afraid I'm having a hard time parsing what you're saying here (what would a "regulator value" be?), but I suspect that you're trying to suggest something fairly close to what is already implemented. The model the regulator API has is that neither the driver for the regulator nor the driver for the consumer should know anything about the particular board, with the consumers just requesting the supplies the device has. A separate piece of board-specific configuration code provides a table mapping the physical regulators in the system to the supplies on the individual chips. There is an option, currently Kconfig only, which causes the regulator API to provide a do-nothing dummy regulator if an attempt is made to request a supply that doesn't exist. I *think* this dummy regulator corresponds to what you're suggesting above but like I say I'm having a hard time parsing it. If the regulator API is compiled out then any attempt to get, enable or disable a regulator just unconditionally reports success. -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
