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.\" $FreeBSD: head/share/man/man4/simplebus.4 301589 2016-06-08 08:50:35Z trasz $
.\"
.Dd July 12, 2010
.Dt SIMPLEBUS 4
.Os
.Sh NAME
.Nm simplebus
.Nd ePAPR simple-bus driver
.Sh SYNOPSIS
.Cd "options FDT"
.Sh DESCRIPTION
This bus driver is dedicated for the
.Pa simple-bus
node of a flattened device tree compliant with the
.Pa ePAPR
specification.
.Pp
The
.Nm
entity does not represent any physical element by itself, it is rather an
umbrella node grouping integrated on-chip peripherals like interrupt
controller, connectivity controllers, accelerating engines and so on.
.Pp
The driver is generic and common for all flattened device tree nodes claiming
.Pa simple-bus
compatibility.
It iterates over direct descendants of the
.Pa simple-bus
node, instantiates newbus children and assigns resources to them, based on the
configuration data retrieved from the nodes properties in
.Xr fdt 4 .
.Pp
Note the
.Nm
does not manage device resources and passes through any requests to the
.Xr fdtbus 4
layer.
.Sh SEE ALSO
.Xr fdt 4 ,
.Xr fdtbus 4 ,
.Xr openfirm 4
.Sh STANDARDS
Power.org Standard for Embedded Power Architecture Platform Requirements
.Pq Vt ePAPR .
.Sh HISTORY
The
.Nm
support first appeared in
.Fx 9.0 .
.Sh AUTHORS
The
.Nm
support was developed by Semihalf under sponsorship from the FreeBSD
Foundation.
This manual page was written by
.An Rafal Jaworowski .