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.h>
19#include <drm/drm_device.h>
20
21#include "arcpgu.h"
22
23static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
24	.destroy = drm_encoder_cleanup,
25};
26
27int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np)
28{
29	struct drm_encoder *encoder;
30	struct drm_bridge *bridge;
31
32	int ret = 0;
33
34	encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
35	if (encoder == NULL)
36		return -ENOMEM;
37
38	/* Locate drm bridge from the hdmi encoder DT node */
39	bridge = of_drm_find_bridge(np);
40	if (!bridge)
41		return -EPROBE_DEFER;
42
43	encoder->possible_crtcs = 1;
44	encoder->possible_clones = 0;
45	ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
46			       DRM_MODE_ENCODER_TMDS, NULL);
47	if (ret)
48		return ret;
49
50	/* Link drm_bridge to encoder */
51	ret = drm_bridge_attach(encoder, bridge, NULL);
52	if (ret)
53		drm_encoder_cleanup(encoder);
54
55	return ret;
56}