On Wed, Oct 11, 2023 at 09:59:31AM +0200, Oleksij Rempel wrote: > Configuration through the device tree and kernel defaults is preferable. > For instance, having a default kernel governor that doesn’t require user > space configuration aligns with the project’s objectives. That's policy though... > > > For the regulator itself we probably want a way to identify regulators > > as being system critical so they start notifying. It would be tempting > > to just do that by default but that would likely cause some issues for > > example with regulators for things like SD cards which are more likely > > to get hardware problems that don't comprimise the entire system. We > > could do that with DT, either a property or some sort of runtime > > consumer, but it might be better to have a control in sysfs that > > userspace can turn on? OTOH the ability do something about this depends > > on specific hardware design... > > > > I've copied in Sebastian since this sounds like the sort of thing that > > power supplies might have some kind of handling for, or at least if we > > need to add something we should make it so that the power supplies can > > be joined up to it. I do see temperature and capacity alerts in the > > sysfs ABI for power supplies, but nothing for voltage. > > Thank you for pointing towards the power supply framework. Given the hardware > design of my project, I can envision mapping the following states and > properties within this framework: There's also hw_failure_emergency_poweroff() which looks like exactly what you're trying to trigger here. > Considering the above mapping, my initial step would be to create a simple > regulator coupled (if regulator is still needed in this casr) with a Device > Tree (DT) based power supply driver. This setup would align with the existing > power supply framework, with a notable extension being the system-wide > notification for emergency shutdown upon under-voltage detection. It sounds like this is actually a regulator regardless of if it also appears via some other API.
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