On Fri, Jun 07, 2013 at 12:19:58PM +0200, Tomasz Figa wrote: > On Thursday 06 of June 2013 21:46:45 Doug Anderson wrote: > > dw_mmc is probed. This regulator is optional, though a warning will > > be printed if it's missing. The fact that the regulator is optional > > means that (at the moment) it's not possible to use a regulator that > > probes _after_ dw_mmc. > > Fix this limitation by adding the ability to make vmmc required. If a > > vmmc-supply is specified in the device tree we'll assume that vmmc is > > required. > This interesting case makes me think that regulator core should > differentiate between regulator lookup failure due to no lookup specified > and due to the regulator specified in lookup being unavailable, returning > appropriate (different) error codes. It does exactly that in so far as it can - you get -ENODEV if there's definitely no supply and -EPROBE_DEFER otherwise.
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