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/share/man/man4/simplebus.4

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29.\" $FreeBSD$
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31.Dd July 12, 2010
32.Dt SIMPLEBUS 4
33.Os
34.Sh NAME
35.Nm simplebus
36.Nd ePAPR simple-bus driver
37.Sh SYNOPSIS
38.Cd "options FDT"
39.Sh DESCRIPTION
40This bus driver is dedicated for the
41.Pa simple-bus
42node of a flattened device tree compliant with the
43.Pa ePAPR
44specification.
45.Pp
46The
47.Nm
48entity does not represent any physical element by itself, it is rather an
49umbrella node grouping integrated on-chip peripherals like interrupt
50controller, connectivity controllers, accelerating engines and so on.
51.Pp
52The driver is generic and common for all flattened device tree nodes claiming
53.Pa simple-bus
54compatibility. It iterates over direct descendants of the
55.Pa simple-bus
56node, instantiates newbus children and assigns resources to them, based on the
57configuration data retrieved from the nodes properties in
58.Xr fdt 4 .
59.Pp
60Note the
61.Nm
62does not manage device resources and passes through any requests to the
63.Xr fdtbus 4
64layer.
65.Sh SEE ALSO
66.Xr fdt 4 ,
67.Xr fdtbus 4 ,
68.Xr openfirm 4
69.Sh STANDARDS
70Power.org Standard for Embedded Power Architecture Platform Requirements
71.Pq Vt ePAPR .
72.Sh HISTORY
73The
74.Nm
75support first appeared in
76.Fx 9.0 .
77.Sh AUTHORS
78The
79.Nm
80support was developed by Semihalf under sponsorship from the FreeBSD
81Foundation. This manual page was written by
82.An Rafal Jaworowski .