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/*
* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*/
#include <drm/drmP.h>
#include <drm/drm_bridge.h>
#include <drm/drm_panel.h>
#include <linux/of_graph.h>
static int lvds_encoder_probe(struct platform_device *pdev)
{
struct device_node *port;
struct device_node *endpoint;
struct device_node *panel_node;
struct drm_panel *panel;
struct drm_bridge *bridge;
/* Locate the panel DT node. */
port = of_graph_get_port_by_id(pdev->dev.of_node, 1);
if (!port) {
dev_dbg(&pdev->dev, "port 1 not found\n");
return -ENXIO;
}
endpoint = of_get_child_by_name(port, "endpoint");
of_node_put(port);
if (!endpoint) {
dev_dbg(&pdev->dev, "no endpoint for port 1\n");
return -ENXIO;
}
panel_node = of_graph_get_remote_port_parent(endpoint);
of_node_put(endpoint);
if (!panel_node) {
dev_dbg(&pdev->dev, "no remote endpoint for port 1\n");
return -ENXIO;
}
panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
if (!panel) {
dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
return -EPROBE_DEFER;
}
bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS);
if (IS_ERR(bridge))
return PTR_ERR(bridge);
platform_set_drvdata(pdev, bridge);
return 0;
}
static int lvds_encoder_remove(struct platform_device *pdev)
{
struct drm_bridge *bridge = platform_get_drvdata(pdev);
drm_bridge_remove(bridge);
return 0;
}
static const struct of_device_id lvds_encoder_match[] = {
{ .compatible = "lvds-encoder" },
{ .compatible = "thine,thc63lvdm83d" },
{},
};
MODULE_DEVICE_TABLE(of, lvds_encoder_match);
static struct platform_driver lvds_encoder_driver = {
.probe = lvds_encoder_probe,
.remove = lvds_encoder_remove,
.driver = {
.name = "lvds-encoder",
.of_match_table = lvds_encoder_match,
},
};
module_platform_driver(lvds_encoder_driver);
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Transparent parallel to LVDS encoder");
MODULE_LICENSE("GPL");
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