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>
25 omapdss_of_get_next_port(const struct device_node *parent,
26 struct device_node *prev)
28 struct device_node *port = NULL;
34 struct device_node *ports;
36 * It's the first call, we have to find a port subnode
37 * within this node or within an optional 'ports' node.
39 ports = of_get_child_by_name(parent, "ports");
43 port = of_get_child_by_name(parent, "port");
45 /* release the 'ports' node */
48 struct device_node *ports;
50 ports = of_get_parent(prev);
55 port = of_get_next_child(ports, prev);
61 } while (of_node_cmp(port->name, "port") != 0);
68 EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
71 omapdss_of_get_next_endpoint(const struct device_node *parent,
72 struct device_node *prev)
74 struct device_node *ep = NULL;
80 ep = of_get_next_child(parent, prev);
84 } while (of_node_cmp(ep->name, "endpoint") != 0);
88 EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
90 struct device_node *dss_of_port_get_parent_device(struct device_node *port)
92 struct device_node *np;
98 np = of_get_parent(port);
100 for (i = 0; i < 2 && np; ++i) {
101 struct property *prop;
103 prop = of_find_property(np, "compatible", NULL);
108 np = of_get_next_parent(np);
114 u32 dss_of_port_get_port_number(struct device_node *port)
119 r = of_property_read_u32(port, "reg", ®);
126 static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
128 struct device_node *np;
130 np = of_parse_phandle(node, "remote-endpoint", 0);
134 np = of_get_next_parent(np);
140 omapdss_of_get_first_endpoint(const struct device_node *parent)
142 struct device_node *port, *ep;
144 port = omapdss_of_get_next_port(parent, NULL);
149 ep = omapdss_of_get_next_endpoint(port, NULL);
155 EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
157 struct omap_dss_device *
158 omapdss_of_find_source_for_first_ep(struct device_node *node)
160 struct device_node *ep;
161 struct device_node *src_port;
162 struct omap_dss_device *src;
164 ep = omapdss_of_get_first_endpoint(node);
166 return ERR_PTR(-EINVAL);
168 src_port = omapdss_of_get_remote_port(ep);
171 return ERR_PTR(-EINVAL);
176 src = omap_dss_find_output_by_port_node(src_port);
178 of_node_put(src_port);
180 return src ? src : ERR_PTR(-EPROBE_DEFER);
182 EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);