tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
19#include <linux/of_graph.h>
20#include <linux/seq_file.h>
21
22#include "omapdss.h"
23
24struct device_node *dss_of_port_get_parent_device(struct device_node *port)
25{
26 struct device_node *np;
27 int i;
28
29 if (!port)
30 return NULL;
31
32 np = of_get_parent(port);
33
34 for (i = 0; i < 2 && np; ++i) {
35 struct property *prop;
36
37 prop = of_find_property(np, "compatible", NULL);
38
39 if (prop)
40 return np;
41
42 np = of_get_next_parent(np);
43 }
44
45 return NULL;
46}
47EXPORT_SYMBOL_GPL(dss_of_port_get_parent_device);
48
49u32 dss_of_port_get_port_number(struct device_node *port)
50{
51 int r;
52 u32 reg;
53
54 r = of_property_read_u32(port, "reg", ®);
55 if (r)
56 reg = 0;
57
58 return reg;
59}
60EXPORT_SYMBOL_GPL(dss_of_port_get_port_number);
61
62struct omap_dss_device *
63omapdss_of_find_source_for_first_ep(struct device_node *node)
64{
65 struct device_node *ep;
66 struct device_node *src_port;
67 struct omap_dss_device *src;
68
69 ep = of_graph_get_endpoint_by_regs(node, 0, 0);
70 if (!ep)
71 return ERR_PTR(-EINVAL);
72
73 src_port = of_graph_get_remote_port(ep);
74 if (!src_port) {
75 of_node_put(ep);
76 return ERR_PTR(-EINVAL);
77 }
78
79 of_node_put(ep);
80
81 src = omap_dss_find_output_by_port_node(src_port);
82
83 of_node_put(src_port);
84
85 return src ? src : ERR_PTR(-EPROBE_DEFER);
86}
87EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);