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f76ee892 TV |
1 | /* |
2 | * Copyright (C) 2013 Texas Instruments | |
3 | * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> | |
4 | * | |
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. | |
8 | * | |
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 | |
12 | * more details. | |
13 | */ | |
14 | ||
15 | #include <linux/device.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/of.h> | |
5161b96d | 19 | #include <linux/of_graph.h> |
f76ee892 TV |
20 | #include <linux/seq_file.h> |
21 | ||
62d9e44e | 22 | #include <video/omapfb_dss.h> |
f76ee892 TV |
23 | |
24 | #include "dss.h" | |
25 | ||
26 | struct device_node * | |
27 | omapdss_of_get_next_port(const struct device_node *parent, | |
28 | struct device_node *prev) | |
29 | { | |
30 | struct device_node *port = NULL; | |
31 | ||
32 | if (!parent) | |
33 | return NULL; | |
34 | ||
35 | if (!prev) { | |
36 | struct device_node *ports; | |
37 | /* | |
38 | * It's the first call, we have to find a port subnode | |
39 | * within this node or within an optional 'ports' node. | |
40 | */ | |
41 | ports = of_get_child_by_name(parent, "ports"); | |
42 | if (ports) | |
43 | parent = ports; | |
44 | ||
45 | port = of_get_child_by_name(parent, "port"); | |
46 | ||
47 | /* release the 'ports' node */ | |
48 | of_node_put(ports); | |
49 | } else { | |
50 | struct device_node *ports; | |
51 | ||
52 | ports = of_get_parent(prev); | |
53 | if (!ports) | |
54 | return NULL; | |
55 | ||
56 | do { | |
57 | port = of_get_next_child(ports, prev); | |
58 | if (!port) { | |
59 | of_node_put(ports); | |
60 | return NULL; | |
61 | } | |
62 | prev = port; | |
a6f13af4 | 63 | } while (!of_node_name_eq(port, "port")); |
f76ee892 TV |
64 | |
65 | of_node_put(ports); | |
66 | } | |
67 | ||
68 | return port; | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(omapdss_of_get_next_port); | |
71 | ||
72 | struct device_node * | |
73 | omapdss_of_get_next_endpoint(const struct device_node *parent, | |
74 | struct device_node *prev) | |
75 | { | |
76 | struct device_node *ep = NULL; | |
77 | ||
78 | if (!parent) | |
79 | return NULL; | |
80 | ||
81 | do { | |
82 | ep = of_get_next_child(parent, prev); | |
83 | if (!ep) | |
84 | return NULL; | |
85 | prev = ep; | |
a6f13af4 | 86 | } while (!of_node_name_eq(ep, "endpoint")); |
f76ee892 TV |
87 | |
88 | return ep; | |
89 | } | |
90 | EXPORT_SYMBOL_GPL(omapdss_of_get_next_endpoint); | |
91 | ||
92 | struct device_node *dss_of_port_get_parent_device(struct device_node *port) | |
93 | { | |
94 | struct device_node *np; | |
95 | int i; | |
96 | ||
97 | if (!port) | |
98 | return NULL; | |
99 | ||
100 | np = of_get_parent(port); | |
101 | ||
102 | for (i = 0; i < 2 && np; ++i) { | |
103 | struct property *prop; | |
104 | ||
105 | prop = of_find_property(np, "compatible", NULL); | |
106 | ||
107 | if (prop) | |
108 | return np; | |
109 | ||
110 | np = of_get_next_parent(np); | |
111 | } | |
112 | ||
113 | return NULL; | |
114 | } | |
115 | ||
116 | u32 dss_of_port_get_port_number(struct device_node *port) | |
117 | { | |
118 | int r; | |
119 | u32 reg; | |
120 | ||
121 | r = of_property_read_u32(port, "reg", ®); | |
122 | if (r) | |
123 | reg = 0; | |
124 | ||
125 | return reg; | |
126 | } | |
127 | ||
128 | static struct device_node *omapdss_of_get_remote_port(const struct device_node *node) | |
129 | { | |
130 | struct device_node *np; | |
131 | ||
5161b96d | 132 | np = of_graph_get_remote_endpoint(node); |
f76ee892 TV |
133 | if (!np) |
134 | return NULL; | |
135 | ||
136 | np = of_get_next_parent(np); | |
137 | ||
138 | return np; | |
139 | } | |
140 | ||
141 | struct device_node * | |
142 | omapdss_of_get_first_endpoint(const struct device_node *parent) | |
143 | { | |
144 | struct device_node *port, *ep; | |
145 | ||
146 | port = omapdss_of_get_next_port(parent, NULL); | |
147 | ||
148 | if (!port) | |
149 | return NULL; | |
150 | ||
151 | ep = omapdss_of_get_next_endpoint(port, NULL); | |
152 | ||
153 | of_node_put(port); | |
154 | ||
155 | return ep; | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(omapdss_of_get_first_endpoint); | |
158 | ||
159 | struct omap_dss_device * | |
160 | omapdss_of_find_source_for_first_ep(struct device_node *node) | |
161 | { | |
162 | struct device_node *ep; | |
163 | struct device_node *src_port; | |
164 | struct omap_dss_device *src; | |
165 | ||
166 | ep = omapdss_of_get_first_endpoint(node); | |
167 | if (!ep) | |
168 | return ERR_PTR(-EINVAL); | |
169 | ||
170 | src_port = omapdss_of_get_remote_port(ep); | |
171 | if (!src_port) { | |
172 | of_node_put(ep); | |
173 | return ERR_PTR(-EINVAL); | |
174 | } | |
175 | ||
176 | of_node_put(ep); | |
177 | ||
178 | src = omap_dss_find_output_by_port_node(src_port); | |
179 | ||
180 | of_node_put(src_port); | |
181 | ||
182 | return src ? src : ERR_PTR(-EPROBE_DEFER); | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep); |