Enable/Disable some sensors when Host On/Off

[Patrick Williams]

On Tue, Oct 20, 2020 at 08:46:30AM -0500, Matt Spinler wrote:
> 
> 
> On 10/19/2020 10:23 AM, Thu Ba Nguyen wrote:
> > 
> > I also thought about the solution for that features:
> > In the current hwmon we support GPIOCHIP + GPIO option which used to
> > enable sensors to read. In the hwmon code, we just set that pin and wait
> > before reading.
> > I think we can support a similar option named GPIOENABLE + GPIOV. When
> > the status of Gpio pin defind in GPIOEANBLE match with GPIOV.
> > That sensors will be read and update to Dbus.
> > If not it will be removed from DBus until the GPIO pin math GPIOV.
> > Maybe we can have many different solutions.
...
> > 
> > If you don't mind, can you tell me how IBM supports that features?
> 
> We lucked out out in that the driver was only loaded when power was on.
> 

Hi Thu,

Is this something you could do similarly?  Rather than have the driver
understand the GPIO directly you can trigger a phosphor-gpio-monitor
service that does a 'bind' / 'unbind' to dynamically enable and disable
the hwmon driver?

Matt, is that how you have the driver configured to load / unload (I
assume your case is for the OCC).

-- 
Patrick Williams
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