Advanced Configuration and Power Interface Specification

ACPI Source Language (ASL)Reference
DriveStrength is an optional argument specifying the output drive capability of the pin, in
hundredths of milliamperes. The bit field name _DRS is automatically created to refer to this portion
of the resource descriptor.
IORestriction is an optional argument and can be IoRestrictionInputOnly,
IoRestrictionOutputOnly, IoRestrictionNone, or IORestrictionNoneAndPreserve.
IORestrictions limit the mode in which the pin can be accessed (Input or Output). They also ensure
that the pin configuration is preserved during periods when the driver is unloaded or the resource has
been disconnected by the driver. If not specified, IoRestrictionNone is assumed. The bit field name
_IOR is automatically created to refer to this portion of the resource descriptor.
ResourceSource is a string which uniquely identifies the GPIO controller referred to by this
descriptor. ResourceSource can be a fully-qualified name, a relative name or a name segment that
utilizes the namespace search rules.
ResourceSourceIndex is an optional argument and is always 0 for this revision.
ResourceUsage is an optional argument and is always ResourceConsumer for this revision.
DescriptorName is an optional argument that specifies a name for an integer constant that will be
created in the current scope that contains the offset of this resource descriptor within the current
resource template buffer. The predefined descriptor field names may be appended to this name to
access individual fields within the descriptor via the Buffer Field operators.
VendorData is an optional argument that specifies a RawDataBuffer containing vendor-defined byte
data to be decoded by the OS driver. The bit field name _VEN is automatically created to refer to
this portion of the resource descriptor.
PinList is a list of pin numbers on the ResourceSource that are described by this descriptor. The bit
field name _PIN is automatically created to refer to this portion of the resource descriptor.
Description
The GpioIo macro evaluates to a buffer that contains a GPIO IO Connection resource descriptor.
The format of the GPIO IO Connection resource descriptor can be found in "GPIO Connection
Descriptor" (Section 6.4.3.8.1). The macro is designed to be used inside of a Resource Template
(Section 19.3.3).
19.6.56 I2CSerialBusV2 (I2C Serial Bus Connection Resource
Descriptor (Version 2) Macro)
Syntax
I2CSerialBusV2 (SlaveAddress, SlaveMode, ConnectionSpeed, AddressingMode, ResourceSource,
ResourceSourceIndex, ResourceUsage, DescriptorName, Shared, VendorData)
Arguments
SlaveAddress is the I2C bus address for this connection. The bit field name _ADR is automatically
created to refer to this portion of the resource descriptor.
SlaveMode is an optional argument and can be either ControllerInitiated or DeviceInitiated.
ControllerInitiated is the default. The bit field name _SLV is automatically created to refer to this
portion of the resource descriptor.
Version 6.0 845