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/of_graph.h>
20 #include <linux/seq_file.h>
22 #include <video/omapfb_dss.h>
27 omapdss_of_get_next_port(const struct device_node *parent,
28 struct device_node *prev)
30 struct device_node *port = NULL;
36 struct device_node *ports;
38 * It's the first call, we have to find a port subnode
39 * within this node or within an optional 'ports' node.
41 ports = of_get_child_by_name(parent, "ports");
45 port = of_get_child_by_name(parent, "port");
47 /* release the 'ports' node */
50 struct device_node *ports;
52 ports = of_get_parent(prev);
57 port = of_get_next_child(ports, prev);
63 } while (of_node_cmp(port->name, "port") != 0);
70 EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
73 omapdss_of_get_next_endpoint(const struct device_node *parent,
74 struct device_node *prev)
76 struct device_node *ep = NULL;
82 ep = of_get_next_child(parent, prev);
86 } while (of_node_cmp(ep->name, "endpoint") != 0);
90 EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
92 struct device_node *dss_of_port_get_parent_device(struct device_node *port)
94 struct device_node *np;
100 np = of_get_parent(port);
102 for (i = 0; i < 2 && np; ++i) {
103 struct property *prop;
105 prop = of_find_property(np, "compatible", NULL);
110 np = of_get_next_parent(np);
116 u32 dss_of_port_get_port_number(struct device_node *port)
121 r = of_property_read_u32(port, "reg", ®);
128 static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
130 struct device_node *np;
132 np = of_graph_get_remote_endpoint(node);
136 np = of_get_next_parent(np);
142 omapdss_of_get_first_endpoint(const struct device_node *parent)
144 struct device_node *port, *ep;
146 port = omapdss_of_get_next_port(parent, NULL);
151 ep = omapdss_of_get_next_endpoint(port, NULL);
157 EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
159 struct omap_dss_device *
160 omapdss_of_find_source_for_first_ep(struct device_node *node)
162 struct device_node *ep;
163 struct device_node *src_port;
164 struct omap_dss_device *src;
166 ep = omapdss_of_get_first_endpoint(node);
168 return ERR_PTR(-EINVAL);
170 src_port = omapdss_of_get_remote_port(ep);
173 return ERR_PTR(-EINVAL);
178 src = omap_dss_find_output_by_port_node(src_port);
180 of_node_put(src_port);
182 return src ? src : ERR_PTR(-EPROBE_DEFER);
184 EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);