drivers/gpu/drm/arc/arcpgu_hdmi.c

/*
 * ARC PGU DRM driver.
 *
 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <drm/drm_crtc.h>
#include <drm/drm_encoder_slave.h>

#include "arcpgu.h"

static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
	.destroy = drm_encoder_cleanup,
};

int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np)
{
	struct drm_encoder *encoder;
	struct drm_bridge *bridge;

	int ret = 0;

	encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
	if (encoder == NULL)
		return -ENOMEM;

	/* Locate drm bridge from the hdmi encoder DT node */
	bridge = of_drm_find_bridge(np);
	if (!bridge)
		return -EPROBE_DEFER;

	encoder->possible_crtcs = 1;
	encoder->possible_clones = 0;
	ret = drm_encoder_init(drm, encoder, &arcpgu_drm_encoder_funcs,
			       DRM_MODE_ENCODER_TMDS, NULL);
	if (ret)
		return ret;

	/* Link drm_bridge to encoder */
	bridge->encoder = encoder;
	encoder->bridge = bridge;

	ret = drm_bridge_attach(drm, bridge);
	if (ret)
		drm_encoder_cleanup(encoder);

	return ret;
}