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+.\" -
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2021 Semihalf
+.\"
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+.\"
+.Dd September 29, 2022
+.Dt DEVICE_GET_PROPERTY 9
+.Os
+.Sh NAME
+.Nm device_get_property ,
+.Nm device_has_property
+.Nd access device specific data
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/bus.h
+.Ft ssize_t
+.Fn device_get_property "device_t dev" "const char *prop" "void *val" "size_t sz" \
+    "device_property_type_t type"
+.Ft bool
+.Fn device_has_property "device_t dev" "const char *prop"
+.Sh DESCRIPTION
+Access device specific data provided by the parent bus.
+Drivers can use these properties to obtain device capabilities and set
+necessary quirks.
+.Pp
+The underlying property type is specified with the
+.Fa type
+argument.
+Currently the following types are supported:
+.Bl -tag -width ".Dv DEVICE_PROP_BUFFER"
+.It Dv DEVICE_PROP_BUFFER
+The underlying property is a string of bytes.
+.It Dv DEVICE_PROP_ANY
+Wildcard property type.
+.It Dv DEVICE_PROP_HANDLE
+Following a reference the underlying property is a handle of the
+respective bus.
+.It Dv DEVICE_PROP_UINT32
+The underlying property is an array of unsigned 32 bit integers.
+The
+.Fa sz
+argument shall be a multiple of 4.
+.It Dv DEVICE_PROP_UINT64
+The underlying property is an array of unsigned 64 bit integers.
+The
+.Fa sz
+argument shall be a multiple of 8.
+.El
+.Sh NOTES
+You can pass NULL as pointer to property's value when calling
+.Fn device_get_property
+to obtain its size.
+.Pp
+Currently this interface is implemented by
+.Xr simplebus 4
+and
+.Xr acpi 4 .
+.Sh RETURN VALUES
+.Fn device_get_property
+if successful returns property's size, otherwise returns -1.
+.Pp
+.Fn device_has_property
+returns true if given property was found.
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr simplebus 4 ,
+.Xr device 9
+.Sh AUTHORS
+This manual page was written by
+.An Bartlomiej Grzesik .