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PIIXPM(4) Device Drivers Manual PIIXPM(4)

piixpm
Intel PIIX SMBus controller

piixpm* at pci?
iic* at piixpm?

The piixpm driver provides support for the Intel PIIX and compatible Power Management controller. Only the SMBus host interface is supported and can be used with the iic(4) framework.
Supported chipsets:

iic(4), intro(4), pci(4)

The piixpm driver first appeared in OpenBSD 3.7 to provide support for the power management (ACPI) timer. In OpenBSD 3.9, power management support was dropped in favor of acpitimer(4) and SMBus functionality was added.

The current piixpm driver was written by Alexander Yurchenko <grange@openbsd.org>.

The driver doesn't support I2C commands with a data buffer size of more than 2 bytes.
July 16, 2013 OpenBSD-6.1