On Thu, 6 Apr 2023 at 01:25, Joe Komlodi <koml...@google.com> wrote: > > Hi all, > > This series adds a couple QOM properties for retrieving and setting pin > state via qom-get and qom-get. > > We ran into a situation in multi-SoC simulation where the BMC would need > to update its input pin state based on behavior from the other SoC. It > made the most sense to expose this over QMP, so this adds properties to > allow people to do so.
This does leave the simulation in an odd situation if the input GPIO was connected to some other device -- the other device thinks it's put the GPIO line low, but then something external has reached in and set it to 1, so the two ends of what is conceptually a single signal line now disagree about what voltage it's at... It looks like the hw/gpio/aspeed_gpio device has been here before you, only that device chose to use one bool property per GPIO line. It would be nice to be consistent -- if we want to allow QOM to set/get the GPIO line values, it should be the same interface regardless of GPIO controller. -- PMM
