1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2009 Nokia Corporation
 4 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 5 *
 6 * Some code and ideas taken from drivers/video/omap/ driver
 7 * by Imre Deak.
 8 */
 9
10#define DSS_SUBSYS_NAME "DISPLAY"
11
12#include <linux/kernel.h>
13#include <linux/of.h>
14
15#include <drm/drm_connector.h>
16#include <drm/drm_modes.h>
17
18#include "omapdss.h"
19
20static int disp_num_counter;
21
22void omapdss_display_init(struct omap_dss_device *dssdev)
23{
24	int id;
25
26	/*
27	 * Note: this presumes that all displays either have an DT alias, or
28	 * none has.
29	 */
30	id = of_alias_get_id(dssdev->dev->of_node, "display");
31	if (id < 0)
32		id = disp_num_counter++;
33
34	/* Use 'label' property for name, if it exists */
35	of_property_read_string(dssdev->dev->of_node, "label", &dssdev->name);
36
37	if (dssdev->name == NULL)
38		dssdev->name = devm_kasprintf(dssdev->dev, GFP_KERNEL,
39					      "display%u", id);
40}
41EXPORT_SYMBOL_GPL(omapdss_display_init);
42
43struct omap_dss_device *omapdss_display_get(struct omap_dss_device *output)
44{
45	while (output->next)
46		output = output->next;
47
48	return omapdss_device_get(output);
49}
50EXPORT_SYMBOL_GPL(omapdss_display_get);
51
52int omapdss_display_get_modes(struct drm_connector *connector,
53			      const struct videomode *vm)
54{
55	struct drm_display_mode *mode;
56
57	mode = drm_mode_create(connector->dev);
58	if (!mode)
59		return 0;
60
61	drm_display_mode_from_videomode(vm, mode);
62
63	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
64	drm_mode_set_name(mode);
65	drm_mode_probed_add(connector, mode);
66
67	return 1;
68}
69EXPORT_SYMBOL_GPL(omapdss_display_get_modes);