On Fri, Mar 16, 2012 at 12:36:35PM +0000, Arnd Bergmann wrote: > On Friday 16 March 2012, Linus Walleij wrote: > > On Thu, Mar 15, 2012 at 9:58 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > > But I guess you're after modelling the levelshifter as a regulator? > > Basically the level shifter is a separate device has two voltage > > inputs A and B (from other regulators) that is controlled by a > > simple GPIO to select voltage A or B to drive the signals to > > the card. > > That could probably be modelled as a regulator with two > > volategs for sure, but then we should maybe create a more > > generic "struct level_shifter_regulator" (or whatever) for the > > concept as a whole. > Ok, thanks for the explanation. I'm not sure I'd bother defining a special regulator type for this if it is done using regulators - given that it's likely to just be a GPIO rather than a specific driver I'm not sure it's worth worrying about how exactly the hardware is implemented. > > Let's page Mark about what to do with levelshifters and whether > > they are regulators of sorts in his book. > It does sound appealing, especially because this one could be > done completely generically by defining a regulator that has > a bunch of other regulators as well as a set of gpio lines as > inputs and one output that can be used in other devices. We > would probably only use this one together with device tree then. It seems sensible to me - probably the existing gpio-regulator driver can do the job, though it's not unreasonable to expect that we'll want to support switching between variable voltage supplies at some point.
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