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
);