On 2014/3/6 11:49, H. Peter Anvin wrote: > On 03/05/2014 07:31 PM, Li, Aubrey wrote: >> The Power Management Controller (PMC) controls many of the power >> management features present in the SoC. This driver provides >> interface to configure the Power Management Controller (PMC). >> >> This driver exposes PMC device state and sleep state residency >> via debugfs for observation: >> /sys/kernel/debugfs/pmc_atom/dev_state >> /sys/kernel/debugfs/pmc_atom/sleep_state >> >> This driver also provides a native power off function via PMC PCI >> IO port. >> > > What is the reason for putting this in debugfs?
S0ix support on Atom SoC needs all of the devices under south complex to be quiesced, as well as the devices under north complex. This interface shows all of the devices states under platform control unit. If the system is not able to enter S0ix, we have a way to diagnose. Or if the system entered S0ix, we have counters to show S0ix entered and its residency. Thanks, -Aubrey > > -hpa > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
