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
22static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
23	.destroy = drm_encoder_cleanup,
24};
25
26int 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	bridge->encoder = encoder;
51	encoder->bridge = bridge;
52
53	ret = drm_bridge_attach(drm, bridge);
54	if (ret)
55		drm_encoder_cleanup(encoder);
56
57	return ret;
58}