1.\" Copyright (c) 2019 Emmanuel Vadot <manu@freebsd.org> 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 12.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 13.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 14.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 15.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 16.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 17.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 18.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 19.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 21.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22.\" 23.\" $FreeBSD$ 24.\" 25.Dd April 10, 2019 26.Dt ofw_graph 9 27.Os 28.Sh NAME 29.Nm ofw_graph , 30.Nm ofw_graph_get_port_by_idx , 31.Nm ofw_graph_port_get_num_endpoints , 32.Nm ofw_graph_get_endpoint_by_idx , 33.Nm ofw_graph_get_remote_endpoint , 34.Nm ofw_graph_get_remote_parent , 35.Nm ofw_graph_get_device_by_port_ep , 36.Nd Helpers for the graph bindings 37.Sh SYNOPSIS 38.In dev/ofw/openfirm.h 39.In dev/ofw/ofw_graph.h 40.Ft phandle_t 41.Fn ofw_graph_get_port_by_idx "phandle_t node" "uint32_t idx" 42.Ft size_t 43.Fn ofw_graph_port_get_num_endpoints "phandle_t port" 44.Ft phandle_t 45.Fn ofw_graph_get_endpoint_by_idx "phandle_t port" "uint32_t idx" 46.Ft phandle_t 47.Fn ofw_graph_get_remote_endpoint "phandle_t endpoint" 48.Ft phandle_t 49.Fn ofw_graph_get_remote_parent "phandle_t remote" 50.Ft device_t 51.Fn ofw_graph_get_device_by_port_ep "phandle_t node" "uint32_t port_id" "uin32_t ep_id" 52.Sh DESCRIPTION 53.Pp 54The ofw_graph functions are helpers to parse the DTS graph bindings 55.Pp 56.Fn ofw_graph_get_port_by_idx 57return the port with id 58.Fa idx . 59It will first check node named 60.Fa port@idx 61and then fallback on checking the 62.Fa ports 63child for a child node matching the id. 64If no ports matching 65.Fa idx 66is found the function return 0. 67.Pp 68.Fn ofw_graph_port_get_num_endpoints 69returns the number of endpoints a port node have. 70.Pp 71.Fn ofw_graph_get_endpoint_by_idx 72return the endpoint with id 73.Fa idx . 74It will first check if there is a single child named 75.Fa endpoint 76and returns it if there is. 77If there is multiple endpoints it will check the 78.Fa reg 79property and returns the correct 80.Fa phandle_t 81or 0 if none match. 82.Pp 83.Fn ofw_graph_get_remote_endpoint 84returns the 85.Fa remote-endpoint 86property if it exists or 0. 87.Pp 88.Fn ofw_graph_get_remote_parent 89returns the device node corresponding to the 90.Fa remote-endpoint 91phandle or 0 if none. 92.Fn ofw_graph_get_device_by_port_ep 93returns the device associated with the port and endpoint or 94.Fa NULL 95if none. 96The device driver should have called 97.Fn OF_device_register_xref 98before. 99.Fn 100.Sh HISTORY 101The 102.Nm ofw_graph 103functions first appeared in 104.Fx 13.0 . 105The 106.Nm ofw_graph 107functions and manual page were written by 108.An Emmanuel Vadot Aq Mt manu@FreeBSD.org . 109