acpi-prop.adoc

RVI-specific ACPI Device Properties

This section is used to define the _DSD device properties cite:[DSD] in the rscv- namespace.

Where explicit values are provided in a property definition, only these values must be used. System behavior with any other values is undefined.

Property	Type	Description
Currently, there are no properties defined in the riscv- namespace. Request for new property names in the rscv- namespace should be made as a git pull request to this table.

ACPI Device Properties for UART Devices

Generic 16550-compatible UART devices can have device properties in the global name space since Operating Systems are already using them.

Property	Type	Description
clock-frequency	Integer	Clock feeding the IP block in Hz.
A value of zero will preclude the ability to set the baud rate, or to configure a disabled device.
reg-offset	Integer	Offset to apply to the register map base address from the start of the registers.
reg-shift	Integer	Quantity to shift the register offsets by.
reg-io-width	Integer	The size (in bytes) of the register accesses that should be performed on the device.
1, 2, 4 or 8.
fifo-size	Integer	The FIFO size (in bytes).