On Tue, Mar 30, 2021 at 12:56:56PM -0500, Zev Weiss wrote: > Okay, to expand a bit on the description in my initial message -- we've > got a single chassis with multiple server boards and a single manager board > that handles, among other things, power control for the servers. > The manager board has one LM25066 for each attached server, which acts as > the "power switch" for that server. There thus really isn't any driver to > speak of for the downstream device. This sounds like you need a driver representing those server boards (or the slots they plug into perhaps) that represents everything about those boards to userspace, including power switching. I don't see why you wouldn't have a driver for that - it's a thing that physically exists and clearly has some software control, and you'd presumably also expect to represent some labelling about the slot as well.
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