2 * Copyright (C) 2013 Texas Instruments
3 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 #include <linux/device.h>
16 #include <linux/err.h>
17 #include <linux/module.h>
19 #include <linux/seq_file.h>
21 #include <video/omapdss.h>
24 omapdss_of_get_next_port(const struct device_node *parent,
25 struct device_node *prev)
27 struct device_node *port = NULL;
33 struct device_node *ports;
35 * It's the first call, we have to find a port subnode
36 * within this node or within an optional 'ports' node.
38 ports = of_get_child_by_name(parent, "ports");
42 port = of_get_child_by_name(parent, "port");
44 /* release the 'ports' node */
47 struct device_node *ports;
49 ports = of_get_parent(prev);
54 port = of_get_next_child(ports, prev);
60 } while (of_node_cmp(port->name, "port") != 0);
65 EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
68 omapdss_of_get_next_endpoint(const struct device_node *parent,
69 struct device_node *prev)
71 struct device_node *ep = NULL;
77 ep = of_get_next_child(parent, prev);
81 } while (of_node_cmp(ep->name, "endpoint") != 0);
85 EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
87 static struct device_node *
88 omapdss_of_get_remote_device_node(const struct device_node *node)
90 struct device_node *np;
93 np = of_parse_phandle(node, "remote-endpoint", 0);
98 np = of_get_next_parent(np);
100 for (i = 0; i < 3 && np; ++i) {
101 struct property *prop;
103 prop = of_find_property(np, "compatible", NULL);
108 np = of_get_next_parent(np);
115 omapdss_of_get_first_endpoint(const struct device_node *parent)
117 struct device_node *port, *ep;
119 port = omapdss_of_get_next_port(parent, NULL);
124 ep = omapdss_of_get_next_endpoint(port, NULL);
130 EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
132 struct omap_dss_device *
133 omapdss_of_find_source_for_first_ep(struct device_node *node)
135 struct device_node *ep;
136 struct device_node *src_node;
137 struct omap_dss_device *src;
139 ep = omapdss_of_get_first_endpoint(node);
141 return ERR_PTR(-EINVAL);
143 src_node = omapdss_of_get_remote_device_node(ep);
148 return ERR_PTR(-EINVAL);
150 src = omap_dss_find_output_by_node(src_node);
152 of_node_put(src_node);
155 return ERR_PTR(-EPROBE_DEFER);
159 EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);