1 /*
2 * ARC PGU DRM driver.
3 *
4 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_encoder_slave.h>
19
20 #include "arcpgu.h"
21
22 static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
23 .destroy = drm_encoder_cleanup,
24 };
25
arcpgu_drm_hdmi_init(struct drm_device * drm,struct device_node * np)26 int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np)
27 {
28 struct drm_encoder *encoder;
29 struct drm_bridge *bridge;
30
31 int ret = 0;
32
33 encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
34 if (encoder == NULL)
35 return -ENOMEM;
36
37 /* Locate drm bridge from the hdmi encoder DT node */
38 bridge = of_drm_find_bridge(np);
39 if (!bridge)
40 return -EPROBE_DEFER;
41
42 encoder->possible_crtcs = 1;
43 encoder->possible_clones = 0;
44 ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
45 DRM_MODE_ENCODER_TMDS, NULL);
46 if (ret)
47 return ret;
48
49 /* Link drm_bridge to encoder */
50 ret = drm_bridge_attach(encoder, bridge, NULL);
51 if (ret)
52 drm_encoder_cleanup(encoder);
53
54 return ret;
55 }
56