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>
26 omapdss_of_get_next_port(const struct device_node *parent,
27 struct device_node *prev)
29 struct device_node *port = NULL;
35 struct device_node *ports;
37 * It's the first call, we have to find a port subnode
38 * within this node or within an optional 'ports' node.
40 ports = of_get_child_by_name(parent, "ports");
44 port = of_get_child_by_name(parent, "port");
46 /* release the 'ports' node */
49 struct device_node *ports;
51 ports = of_get_parent(prev);
56 port = of_get_next_child(ports, prev);
62 } while (of_node_cmp(port->name, "port") != 0);
67 EXPORT_SYMBOL_GPL(omapdss_of_get_next_port);
70 omapdss_of_get_next_endpoint(const struct device_node *parent,
71 struct device_node *prev)
73 struct device_node *ep = NULL;
79 ep = of_get_next_child(parent, prev);
83 } while (of_node_cmp(ep->name, "endpoint") != 0);
87 EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint);
89 struct device_node *dss_of_port_get_parent_device(struct device_node *port)
91 struct device_node *np;
97 np = of_get_next_parent(port);
99 for (i = 0; i < 2 && np; ++i) {
100 struct property *prop;
102 prop = of_find_property(np, "compatible", NULL);
107 np = of_get_next_parent(np);
113 u32 dss_of_port_get_port_number(struct device_node *port)
118 r = of_property_read_u32(port, "reg", ®);
125 static struct device_node *omapdss_of_get_remote_port(const struct device_node *node)
127 struct device_node *np;
129 np = of_parse_phandle(node, "remote-endpoint", 0);
133 np = of_get_next_parent(np);
139 omapdss_of_get_first_endpoint(const struct device_node *parent)
141 struct device_node *port, *ep;
143 port = omapdss_of_get_next_port(parent, NULL);
148 ep = omapdss_of_get_next_endpoint(port, NULL);
154 EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint);
156 struct omap_dss_device *
157 omapdss_of_find_source_for_first_ep(struct device_node *node)
159 struct device_node *ep;
160 struct device_node *src_port;
161 struct omap_dss_device *src;
163 ep = omapdss_of_get_first_endpoint(node);
165 return ERR_PTR(-EINVAL);
167 src_port = omapdss_of_get_remote_port(ep);
170 return ERR_PTR(-EINVAL);
175 src = omap_dss_find_output_by_port_node(src_port);
177 of_node_put(src_port);
179 return src ? src : ERR_PTR(-EPROBE_DEFER);
181 EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);