dss-of.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2013 Texas Instruments
 4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 5 */
 6
 7#include <linux/device.h>
 8#include <linux/err.h>
 9#include <linux/export.h>
10#include <linux/module.h>
11#include <linux/of.h>
12#include <linux/of_graph.h>
13#include <linux/seq_file.h>
14
15#include <video/omapfb_dss.h>
16
17#include "dss.h"
18
19struct device_node *dss_of_port_get_parent_device(struct device_node *port)
20{
21	struct device_node *np;
22	int i;
23
24	if (!port)
25		return NULL;
26
27	np = of_get_parent(port);
28
29	for (i = 0; i < 2 && np; ++i) {
30		struct property *prop;
31
32		prop = of_find_property(np, "compatible", NULL);
33
34		if (prop)
35			return np;
36
37		np = of_get_next_parent(np);
38	}
39
40	of_node_put(np);
41	return NULL;
42}
43
44u32 dss_of_port_get_port_number(struct device_node *port)
45{
46	int r;
47	u32 reg;
48
49	r = of_property_read_u32(port, "reg", &reg);
50	if (r)
51		reg = 0;
52
53	return reg;
54}
55
56struct omap_dss_device *
57omapdss_of_find_source_for_first_ep(struct device_node *node)
58{
59	struct device_node *ep;
60	struct device_node *src_port;
61	struct omap_dss_device *src;
62
63	ep = of_graph_get_endpoint_by_regs(node, 0, -1);
64	if (!ep)
65		return ERR_PTR(-EINVAL);
66
67	src_port = of_graph_get_remote_port(ep);
68	of_node_put(ep);
69	if (!src_port)
70		return ERR_PTR(-EINVAL);
71
72	src = omap_dss_find_output_by_port_node(src_port);
73
74	of_node_put(src_port);
75
76	return src ? src : ERR_PTR(-EPROBE_DEFER);
77}
78EXPORT_SYMBOL_GPL(omapdss_of_find_source_for_first_ep);