On Fri, May 23, 2014 at 12:57:17PM -0700, Stephen Boyd wrote: > Optional properties: > -- vdd-supply: supply for Ethernet mac > +- vdd-supply: analog 3.3V supply for Ethernet mac > +- vdd-io-supply: digital 1.8V IO supply for Ethernet mac So, according to the datasheet I managed to find this device has a supply VDD_IO (so normally written vdd-io-supply here), some other supplies which are tied to VDD_IO (so can probably be omitted) and a supply VDD_A3.3 none of which are optional. There is an internal regulator which can be used to drop a higher voltage VDD_IO down for some of the supplies tied to it but that's essentially a noop from software as far as I can tell. None of these supplies are obviously optional, though I've not read the datasheet in detail so I may have missed something here. That said it looks like this is intended to be a supply for an external PHY rather than the device itself, but even so my original question about it being able to operate without power still applies. Looking at the code it's certainly not doing any of the handling of a missing supply that I would associate with using _optional().
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