On Tue, Jun 29, 2021 at 10:21:45PM +0200, H. Nikolaus Schaller wrote: > There seems to be a deadlock in probing: > e.g. ldo3_reg depends on vdds_1v8_main supply > vdds_1v8_main depends on smps7_reg supply > smps7_reg depends on vsys_cobra supply > vsys_cobra depends on nothing > This would normally lead to a simple chain as you described above. But > ldo3_reg and smps7_reg share the same driver and can probe successfully or > fail only in common. I don't see any deadlock there? Just a straightforward set of dependencies. Anything circular would clearly be a driver bug. > Now if ldo3_reg defers probe through the new rule, smps7_reg is never > probed successfully because it is the same driver. Hence vdds_1v8_main can > not become available. And the Palmas continues to run in boot initialization > until some driver (MMC) wants to switch voltages or whatever. The driver should just register all the DCDCs before the LDOs, then everything will sort itself out. It's *possible* you might see a system trying to link things together regulators of the same type but that's very unusual as it makes the system less efficient.
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